THE EVERYDAY TOOLBOX
Less busywork.
More done.
A budget to balance. A file to fix. A number to figure out. Find a little help for whatever’s on your desk.
/
Try
A change of scale.
is equal to
Open the full converter
368 useful tools 368 plain-English guides No sign-up. No uploads.
A FEW GOOD PLACES TO START
Small tasks. Sorted.
DO THE MATH
Percentages, minus the headache.
Percent of, percent change, or “what percent is that?”
Percentage CalculatorUNTANGLE THE DETAILS
Give messy data some breathing room.
Readable JSON, without the setup or the upload.
JSON FormatterFIND YOUR WORDS
A second pair of eyes for your text.
Word count, reading time, and the details in between.
Word CounterTHE WHOLE TOOLBOX
What’s on your list?
368 tools, ready when you are
- Percentage Calculator Percentage of a number, percent change, increase/decrease. Math
- Word Counter Count words, characters, sentences and reading time. Text
- JSON Formatter Format, validate, and beautify JSON with custom indentation. Developer
- Length Converter Convert meters, feet, inches, miles, km and more. Converters
- QR Code Generator Create QR codes for links, text, Wi-Fi and more. Generators
- Age Calculator Calculate exact age in years, months, days from a birth date. Time
- Compound Interest Calculator Calculate compound interest with optional regular contributions. Finance
- Time Zone Converter Convert a date and time between any two time zones. Time
- Color Picker Pick a color and get hex, RGB, HSL codes plus a coordinating palette. Design
- Recipe Scaler Scale any recipe up or down by servings or a custom factor — fractions stay readable (1 1/2 cups, 3/4 tsp). Food & Cooking
- Paint Calculator Estimate how much paint you need for a room from its dimensions, the number of coats, and the paint coverage. Home & DIY
- Final Grade Calculator Enter your current grade and the final’s weight to see the exact score you need for your target. School & Study
- BMI Calculator Body Mass Index calculator with metric & imperial units. Health
- Loan Calculator Calculate monthly payments, total interest, and total cost for any loan. Finance
- Tip Calculator Calculate tips and split bills between any number of people. Finance
- Color Converter Convert between hex, RGB, and HSL color formats instantly. Design
- Case Converter Convert text to uppercase, lowercase, title case, camelCase, and more. Text
- Date Difference Calculator Calculate the number of days, weeks, and months between two dates. Time
- Base64 Encoder & Decoder Encode text to Base64 or decode Base64 back to text instantly. Security
- Temperature Converter Convert between Celsius, Fahrenheit, and Kelvin instantly. Converters
- Weight Converter Convert between kilograms, pounds, ounces, grams, and more. Converters
- Hash Generator Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly. Security
- URL Encoder & Decoder Encode text for URLs or decode URL-encoded strings instantly. Developer
- Number to Words Convert any integer to its English word representation. Text
- Lorem Ipsum Generator Generate placeholder Lorem Ipsum text for designs and mockups. Generators
- Data Size Converter Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes. Converters
- Random Number Generator Generate random numbers within a range using cryptographic randomness. Generators
- Markdown to HTML Converter Convert Markdown text to clean HTML instantly in your browser. Developer
- Text Reverser Reverse text by characters, words, or lines instantly. Text
- Slug Generator Convert text to URL-friendly slugs for web pages and blog posts. Developer
- HTML Entity Encoder & Decoder Encode HTML entities or decode entity-encoded text instantly. Developer
- Compound Interest Comparison Calculator Compare 2-3 compound interest scenarios side by side. Finance
- Discount Calculator Calculate sale prices, discounts, and savings instantly. Finance
- Sales Tax Calculator Calculate sales tax on any purchase, before or after tax. Finance
- Sales Tax by State Calculator Calculate US sales tax by state plus an optional local rate. Finance
- Volume Converter Convert between liters, gallons, cups, milliliters, and more. Converters
- Area Converter Convert between square meters, square feet, acres, hectares, and more. Converters
- Speed Converter Convert between mph, km/h, knots, meters per second, and more. Converters
- Time Converter Convert between seconds, minutes, hours, days, weeks, months, and years. Converters
- UUID Generator Generate random UUID v4 identifiers instantly in your browser. Generators
- Fraction to Decimal Calculator Convert fractions to decimals and simplify fractions instantly. Math
- GCD Calculator Find the Greatest Common Divisor of two or more integers. Math
- Prime Number Checker Check if a number is prime and find its smallest factor if not. Math
- Average Calculator Calculate mean, median, and mode of any set of numbers. Math
- Roman Numeral Converter Convert numbers to Roman numerals and Roman numerals to numbers. Converters
- Character Counter Count total characters, unique characters, and frequency of each character. Text
- LCM Calculator Find the Least Common Multiple of two or more integers. Math
- Factorial Calculator Calculate the factorial of any non-negative integer up to 170. Math
- Exponent Calculator Calculate powers and exponents: base raised to any exponent. Math
- Ratio Calculator Calculate and simplify ratios between two numbers. Math
- Circle Calculator Calculate the area, circumference, or diameter of a circle. Math
- Savings Goal Calculator Calculate how long it takes to reach your savings goal. Finance
- Net Worth Calculator Calculate your net worth: total assets minus total liabilities. Finance
- Token Counter Estimate token count for LLM prompts (GPT-4, Claude, Llama, Mistral). Developer
- Regex Tester Test regular expressions with live match highlighting and groups. Developer
- JWT Decoder Decode JSON Web Tokens and inspect header, payload, and expiry. Security
- Cron Expression Generator Generate cron expressions for scheduled tasks with human-readable descriptions. Developer
- CSS Gradient Generator Create CSS gradients (linear, radial, conic) with live preview. Design
- Meta Tag Generator Generate SEO meta tags, Open Graph, Twitter Cards, and JSON-LD schema. Developer
- Hashtag Generator Generate relevant hashtags from your text for social media posts. Generators
- BMR Calculator Basal Metabolic Rate calculator using Mifflin-St Jeor or Harris-Benedict. Health
- Calorie Calculator Daily calorie needs and TDEE calculator with activity levels and goals. Health
- Ideal Weight Calculator Ideal body weight calculator from four medical formulas. Health
- Simple Interest Calculator Simple interest calculator for loans, deposits, and investments. Finance
- ROI Calculator Return on Investment calculator with annualized ROI. Finance
- Mortgage Calculator Mortgage calculator with monthly payment, total paid, and interest. Finance
- Inflation Calculator Inflation calculator: see how money loses value over time. Finance
- Salary Calculator Convert hourly wage to annual, monthly, weekly, and daily salary. Finance
- Hex to RGB Converter Convert hex colors to RGB and HSL with a live swatch. Design
- Binary Converter Convert between binary, octal, decimal, and hex. Converters
- Standard Deviation Calculator Standard deviation, variance, mean, and median of a dataset. Math
- Permutation and Combination Calculator Calculate permutations (nPr) and combinations (nCr). Math
- Quadratic Equation Solver Solve ax² + bx + c = 0 and find roots, discriminant, and nature. Math
- Triangle Calculator Solve a triangle from its three sides: area, perimeter, and angles. Math
- CSS Box Shadow Generator Generate CSS box-shadow with a live preview. Design
- Dice Roller Roll any number of dice with any number of sides. Generators
- Lottery Number Generator Generate random lottery numbers from a range. Generators
- Morse Code Translator Translate text to Morse code and Morse code back to text. Text
- Caesar Cipher Encrypt and decrypt text with a Caesar (shift) cipher. Security
- Pig Latin Translator Translate English text into Pig Latin. Text
- Email Validator Check if an email address is valid and well-formed. Developer
- URL Parser Break a URL into protocol, host, path, query, and fragment. Developer
- Scientific Notation Converter Convert between decimal and scientific notation. Converters
- Decimal to Fraction Converter Convert any decimal to a simplified fraction. Math
- Remove Duplicate Lines Remove duplicate lines from a list, keeping the first. Text
- Find and Replace Text Find and replace text with literal or regex matching. Text
- JSON to CSV Converter Convert a JSON array of objects to CSV. Developer
- CSV to JSON Converter Convert CSV data to a JSON array of objects. Developer
- Color Contrast Checker Check WCAG color contrast between two colors. Design
- Fraction Simplifier Reduce a fraction to its simplest form. Math
- Decimal to Percent Converter Convert between decimals and percentages. Converters
- Aspect Ratio Calculator Reduce width and height to a simple aspect ratio. Design
- CSS Minifier Minify CSS by removing comments and whitespace. Developer
- JavaScript Minifier Minify JavaScript by removing comments and whitespace. Developer
- Fraction to Decimal Converter Convert a fraction to a decimal and detect repeating cycles. Converters
- HTML Minifier Minify HTML by removing comments and whitespace. Developer
- SQL Formatter Format and beautify SQL queries with indentation. Developer
- Leap Year Checker Check whether any year is a leap year. Time
- HTML to Text Converter Strip HTML tags and convert to plain text. Text
- Word Frequency Counter Count how often each word appears in text. Text
- Time Duration Calculator Find the duration between two dates and times. Time
- Week Number Calculator Find the ISO 8601 week number for any date. Time
- Day of Week Calculator Find the day of the week for any date. Time
- Water Intake Calculator Estimate your daily water intake from weight and activity. Health
- Body Fat Calculator Estimate body fat percentage with the US Navy method. Health
- Calories Burned Calculator Estimate calories burned by activity and duration. Health
- Retirement Calculator Project your retirement savings and check a target. Finance
- Unit Price Calculator Compare prices by computing the cost per unit. Finance
- Date Adder Add or subtract days, weeks, months, and years from a date. Time
- Slope Calculator Find the slope, intercept, angle, and length of a line. Math
- Logarithm Calculator Compute logarithms with any base, plus ln and log10. Math
- ASCII Text Converter Convert text to ASCII codes and back. Developer
- Line Sorter Sort lines of text alphabetically, ascending or descending. Text
- Reverse Words Reverse the order of words in a sentence. Text
- Trim Whitespace Normalize, trim, or remove whitespace from text. Text
- Pressure Converter Convert between pascal, bar, atm, psi, mmHg and more. Converters
- Angle Converter Convert between degrees, radians, gradians, and turns. Converters
- Probability Calculator Compute probabilities for coins, dice, and drawing without replacement. Math
- Cooking Converter Convert between cups, tablespoons, teaspoons, ml, fl oz, pints, quarts, liters and gallons. Food & Cooking
- Fuel Cost Calculator Estimate fuel cost for a trip from distance, fuel efficiency, and fuel price. Finance
- Fuel Cost with Stops Calculator Calculate total fuel cost for a multi-stop road trip across several legs. Finance
- Pace Calculator Calculate running pace, speed, and finish time from distance and time. Health
- Color Palette Generator Generate complementary, analogous, triadic, tetradic, and monochromatic palettes from a base color. Design
- GPA Calculator Calculate your grade point average on a 4.0 scale from courses and credit hours. School & Study
- Markdown Table Generator Convert CSV, tab, pipe, or whitespace data into a GitHub-flavored markdown table. Developer
- HMAC Generator Generate HMAC-SHA256/SHA-1/SHA-384/SHA-512 codes from a message and secret key. Security
- Vigenère Cipher Encrypt and decrypt text with a Vigenère cipher using a keyword. Security
- Base Converter Convert numbers between any base from 2 to 36, including fractional values. Converters
- Randomizer Shuffle a list into a random order or pick N random items. Dedupe option. Generators
- Pomodoro Timer Plan and run a Pomodoro session: focus blocks with short and long breaks, plus a live countdown. Time
- Time Card Calculator Calculate work hours from clock-in/out times across shifts, with breaks and overtime pay. Finance
- Payroll Calculator Estimate gross-to-net paycheck from salary or hourly rate. Finance
- Sleep Cycle Calculator Find the best bedtime or wake-up time based on 90-minute sleep cycles. Health
- Mortgage Refinance Calculator Compare current mortgage vs refinance options — monthly savings, break-even, and net savings. Finance
- Loan Payoff Calculator See how extra payments pay off a loan early and how much interest you save. Finance
- Date Countdown Count the days, weeks, months and years until or since a target date. Time
- Bill Splitter Split a bill with tax and tip across any number of people. Finance
- Blood Alcohol Content (BAC) Estimator Estimate your blood alcohol content (BAC) from drinks, weight, sex, and time. Health
- Retirement Withdrawal Calculator See how long your nest egg lasts and check the 4% safe withdrawal rule. Finance
- Currency Converter Convert an amount between major world currencies using a static reference exchange-rate table. Finance
- Unit Price Comparison Compare prices per unit to find the best value across different sizes and units. Finance
- BMI & Calorie Target Calculator Calculate your BMI and daily calorie target for weight loss, maintenance or gain. Health
- Macro Calculator Calculate daily protein, carb and fat targets in grams from your calorie target and macro split. Health
- Extra Mortgage Payment Calculator See how an extra monthly payment speeds up your mortgage payoff and how much interest you save. Finance
- Tip Splitter Split a bill with tip and tax across people, with quick tip picks, weighted shares, and cash-friendly rounding. Finance
- TDEE Calculator Estimate your Total Daily Energy Expenditure (calories burned per day) from BMR x activity, with metric or imperial units and a goal target. Health
- Tip Pool Calculator Distribute a tip pool across staff by hours worked or points, with each worker's share and percentage. Finance
- Net Paycheck Calculator Estimate your after-tax take-home pay from a salary or hourly rate, per paycheck, month, week, and hour. Finance
- Investment Fee Calculator See how an annual expense ratio erodes your investment over time, and how much you lose to fees. Finance
- Interest-Only Loan Calculator Compute the interest-only payment and total interest for a loan with an interest-only period before amortization. Finance
- Text Diff Compare two blocks of text line by line and highlight added, deleted, and unchanged lines. Text
- Case Convert Batch Apply uppercase, lowercase, title, camel, snake, or kebab case to a whole list of strings at once. Text
- Reverse Text Batch Reverse a list of strings by characters, words, or lines all at once. Text
- Slugify Batch Convert a whole list of strings to URL-friendly slugs in one click. Text
- Hash Batch Hash a whole list of strings with SHA-1, SHA-256, SHA-384, or SHA-512 in one click. Security
- Base64 Batch Base64-encode or decode a whole list of strings in one click. Security
- URL Decode Batch URL-encode or URL-decode a whole list of strings in one click. Developer
- JSON Minify Minify a JSON string — strip whitespace and compact it to one line. Developer
- Triangle Area Calculator Find the area of a triangle from base and height or from three sides (Heron's formula). Math
- Heart Rate Zone Calculator Find your training heart rate zones (Zone 1-5) from age and resting heart rate, using Karvonen or percent-of-max methods. Health
- One Rep Max Calculator Estimate your one-rep max (1RM) from a weight you lifted for reps, using Epley, Brzycki, Lombardi or Lander, plus a training-load table. Health
- Break-Even Calculator Find the break-even point in units and revenue from fixed costs, price and variable cost. Business
- Markup Calculator Calculate a selling price from a unit cost and a markup percentage, with the profit margin shown side by side. Business
- Invoice Generator Create a printable invoice from line items with discount and sales tax, then print or save as PDF. Business
- RPM Converter Convert between RPM, radians/second, hertz, and degrees/second instantly. Converters
- Data Unit Converter Convert bytes, KB, MB, GB, TB and binary KiB, MiB, GiB, TiB with correct SI vs IEC labels. Converters
- Random Color Generator Generate random colors as hex, RGB, and HSL for design inspiration and testing. Generators
- Random Date Generator Generate random dates within a date range, with ISO, US, EU, and long formats. Generators
- Random Team Generator Split a list of names into random, balanced teams for games, sports, and assignments. Generators
- Ascii85 Encoder & Decoder Encode text to Ascii85 (Base85) or decode Ascii85 back to text instantly. Security
- Hex Encoder & Decoder Encode text to hexadecimal or decode hex back to text, with 0x prefix and spacing options. Security
- Punycode Converter Convert internationalized domain names (IDN) to Punycode (xn--) and back. Developer
- Base32 Encoder & Decoder Encode text to Base32 (RFC 4648) or decode Base32 back to text instantly. Security
- ROT13 Encoder & Decoder Encode or decode text with ROT13, the self-inverse Caesar shift of 13. Security
- Atbash Cipher Encrypt and decrypt text with the Atbash (reverse-alphabet) cipher. Security
- Letter Frequency Counter Count how often each letter appears in text — for frequency analysis and cipher-breaking. Text
- Markup vs Margin Calculator Enter a cost and a selling price to see both the markup % and the profit margin % at a glance. Business
- CAGR Calculator Calculate the compound annual growth rate (CAGR) of an investment from its start and end values. Finance
- Loan Qualifier Calculator Find the maximum loan and home price you qualify for from your income, debts, rate, and DTI. Finance
- Color Shade Generator Generate lighter tints and darker shades of a base color. Design
- Border Radius Generator Generate CSS border-radius with a live preview. Design
- Pregnancy Due Date Calculator Estimate your pregnancy due date from your last period or conception date, with trimester milestones. Health
- Ovulation Calculator Find your fertile window and next ovulation date from your last period and cycle length. Health
- Pregnancy Weight Gain Calculator See recommended pregnancy weight gain by pre-pregnancy BMI, pregnancy type, and current week. Health
- Focus Timer A simple countdown focus timer with start, pause and reset — and an optional end-time estimate. Time
- Meeting Cost Calculator Estimate the cost of a meeting from attendee headcount, hourly rate and duration. Business
- Time Zone Meeting Planner Find a meeting time that works across time zones, with each attendee’s local time shown. Time
- Workday Calculator Count business days between two dates, excluding weekends and holidays. Time
- Text Statistics Word, sentence, character counts, average lengths and reading-level estimate. Text
- Syllable Counter Count the syllables in each word of your text, with a per-word breakdown. Text
- Reading Time Estimator Estimate reading and speaking time from a word count and words-per-minute rate. Text
- Text Similarity Checker Compare two strings with Levenshtein edit distance and a similarity percentage. Text
- Compound Frequency Calculator Compare how annual, monthly, daily, and continuous compounding change the final balance for the same rate. Finance
- Amortization Schedule Generator Generate a full month-by-month amortization schedule for any fixed-rate loan. Finance
- Debt Snowball Calculator Pay off multiple debts smallest-balance-first with the snowball method and a fixed extra payment. Finance
- JSONPath Extractor Extract values from any JSON document using a JSONPath query expression. Developer
- HTML Tag Extractor Extract every tag, attribute, class, and id from an HTML snippet. Developer
- CSS Unit Converter Convert CSS lengths between px, rem, em, pt, pc, in, cm, mm, vw, vh, and %. Design
- Image to Base64 Encoder Encode an image file to a base64 data URI, or decode a data URI back to bytes. Developer
- Cron Next Run Calculator Show the next N run times for any 5-field cron expression from a start time. Developer
- JSON Prettify vs Minify Show the same JSON pretty and minified side by side with the character savings. Developer
- Fuel Economy Calculator Calculate your vehicle's fuel economy (MPG, L/100km, km/L) from distance traveled and fuel used. Finance
- Electricity Cost Calculator Estimate the running cost of an appliance from its wattage, daily hours, days, and your electricity rate. Home & DIY
- Tile Calculator Calculate how many tiles you need from the floor or wall area, tile size, and a waste allowance. Home & DIY
- JSON to YAML Converter Convert JSON to YAML and YAML back to JSON instantly in your browser. Developer
- YAML Validator Validate YAML online and re-print it as clean canonical YAML. Developer
- Markdown to HTML Converter (Two-Way) Convert Markdown to HTML and HTML back to Markdown in your browser. Developer
- TOML to JSON Converter Convert TOML to JSON and JSON back to TOML instantly in your browser. Developer
- JSON Validator Validate JSON and pinpoint the exact line and column of any syntax error. Developer
- UUID Validator Validate a UUID, extract its version, variant, and get the canonical form. Developer
- Regex Explainer Parse a regular expression and explain each token in plain English. Developer
- Credit Card Validator Validate a card number with the Luhn checksum and identify the issuing network. Finance
- String Trim Lines Trim each line of text and optionally drop blank lines. Text
- Slugify Path Slugify a URL path segment-by-segment while preserving its slash structure. Text
- Sort Words Sort the words in a string alphabetically or by length, ascending or descending. Text
- Text Joiner Join lines or words into one string with a separator, optionally removing duplicates. Text
- ASCII Table Complete ASCII character table with decimal, hex and binary codes, plus a char-to-code converter. Reference
- Periodic Table Lookup Look up any chemical element by symbol, name or atomic number — mass, category, group and period. Reference
- Multiplication Table Generate a printable multiplication table (times table) from 1x1 up to 20x20. Reference
- Number to Words (Currency) Convert a number into currency words for check writing — dollars and cents, euros, pounds or yen. Text
- Stopwatch Count-up stopwatch with lap and split times, plus fastest, slowest and average lap stats. Time
- Epoch Converter Convert Unix timestamps to human-readable UTC dates and back, in seconds or milliseconds. Time
- Waist-to-Height Ratio Calculator Check your waist-to-height ratio (WHtR) against the 0.5 healthy boundary and risk bands. Health
- CSS Text Shadow Generator Build CSS text-shadow with a live preview and presets for classic, hard, subtle, neon and retro looks. Design
- Military Time Converter Convert military (24-hour) time to 12-hour AM/PM and back, with a full chart. Time
- Force Converter Convert between newtons, kilonewtons, pounds-force, kilograms-force, dynes and more. Converters
- Energy Converter Convert joules, kilojoules, calories, kilocalories, watt-hours, kWh, BTU, foot-pounds and eV. Converters
- Coin Flip Simulator Flip 1 to 10,000 coins at once and see heads/tails counts, percentages and streaks. Generators
- Body Surface Area Calculator Calculate body surface area (BSA) in m² with the Du Bois, Mosteller, Haycock and Gehan & George formulas. Health
- Waist-to-Hip Ratio Calculator Check your waist-to-hip ratio (WHR) against WHO risk cutoffs for men and women. Health
- 50/30/20 Budget Calculator Split your monthly take-home pay into needs, wants and savings with the 50/30/20 rule. Finance
- Significant Figures Calculator Count significant figures in any number and round it to N significant figures. Math
- Word Diff Checker Compare two texts word by word with inline highlights for added and deleted words. Text
- HTTP Status Code Lookup Look up any HTTP status code by number or keyword and see what it means and when it happens. Developer
- Markdown Table Formatter Align and tidy existing markdown tables — equal-width columns, consistent separators, no broken rows. Developer
- Color Blindness Simulator See any hex color through eight types of color vision deficiency, from red-blind to greyscale. Design
- Checksum Calculator Compute CRC-32, Adler-32 and FNV-1a checksums of any text, in hex and decimal. Security
- Hash Compare Compare two hashes side by side and get an instant match or mismatch verdict. Security
- Unicode Lookup Look up any character or code point: name, block, plane, UTF-8 and UTF-16 encodings. Reference
- Bingo Card Generator Generate printable bingo cards — US 75-ball 5x5 with FREE centre or UK 90-ball tickets. Generators
- Country Code Lookup Look up ISO 3166 country codes — alpha-2, alpha-3 and numeric — by code or name. Reference
- MIME Type Lookup Find the MIME type for a file extension — or the extensions that use a type. Reference
- NATO Phonetic Alphabet Spell any text in the NATO alphabet — Alfa, Bravo, Charlie — with a full reference table. Reference
- Greek Alphabet Table All 24 Greek letters: name, uppercase, lowercase, code point and where each is used. Reference
- SI Prefix Reference All 24 SI prefixes from quetta to quecto — factors, symbols and a quick converter. Reference
- HTML Color Names All 148 CSS named colors with hex and RGB values — searchable and click-to-copy. Reference
- Keyboard Shortcut Reference Searchable cheat sheet of common Windows and macOS keyboard shortcuts. Reference
- Tournament Bracket Generator Build single or double elimination brackets for 2–64 entrants, with byes. Generators
- Secret Santa Pairing Assign Secret Santa givers with exclusions for couples — no self-draws. Generators
- Polyhedral Dice Set Roller Roll the full RPG dice set — d4 to d20 — with a modifier, in one click. Generators
- Raffle Draw Generator Draw raffle or door-prize winners from a list of names and assign them to prizes in order. Generators
- Pick For Me — Decision Maker Can't decide? List your options (weights optional) and let the tool pick one fairly. Generators
- CSS Flexbox Generator Build the flex container: direction, justify-content, align-items, wrap, and gap — with live preview. Design
- CSS Grid Generator Generate grid-template-columns, rows, and gap from a track count or an explicit track list. Design
- CSS Clip Path Generator Crop elements into circles, ellipses, rounded insets, and polygon shapes with live preview. Design
- CSS Transition Generator Generate CSS transition shorthand — properties, duration, easing (cubic-bezier, steps) and delay. Design
- CSS Filter Generator Combine blur, brightness, contrast, hue-rotate, sepia and drop-shadow into filter CSS. Design
- Font Size Clamp Generator Generate fluid typography with clamp() — font sizes that scale smoothly with the viewport. Design
- Caesar Shift Detector Break a Caesar cipher: all 25 shifts tried and scored for English-ness, best first. Security
- XOR Cipher Encrypt or decrypt text with repeating-key XOR, output as hex or base64. Security
- Data Transfer Rate Converter Convert bandwidth and transfer speeds: bps, Kbps, Mbps, Gbps and the byte-based MB/s, GB/s equivalents. Converters
- Paper Size Converter Convert paper sizes A0–A10, Letter, Legal and Tabloid between millimetres and inches, with area and fit checks. Converters
- Shoe Size Converter Convert shoe sizes between US, UK and EU for men and women, anchored on foot length in cm and inches. Converters
- Byte Frequency Analyzer Break text into its UTF-8 bytes: distribution table, printable/control/high-byte split and Shannon entropy. Security
- Columnar Transposition Cipher Encrypt or decrypt text with the classic keyword-driven columnar transposition — characters rearranged, never substituted. Security
- Power Converter Convert watts, kilowatts, horsepower, PS, BTU/h and tons of refrigeration. Converters
- Torque Converter Convert newton-meters, kilogram-force meters, pound-feet, pound-inches and ounce-inches. Converters
- Flow Rate Converter Convert L/min, m³/h, US gallons per minute, imperial gpm and CFM. Converters
- Illuminance Converter Convert lux, foot-candles, kilolux, millilux, phots and lumens per square inch. Converters
- Moon Phase Calculator Find the moon phase, illumination and age for any date, plus the next new and full moon. Time
- Sunrise & Sunset Calculator Exact sunrise, sunset, solar noon, day length and civil twilight for any date and place. Time
- Easter Date Calculator Western and Orthodox Easter for any year, plus Ash Wednesday, Good Friday and Pentecost. Time
- Time Zone Offset Table Every major time zone's UTC offset right now — with DST status and local times. Time
- Unix Epoch Milestones Countdowns to 2 billion seconds since 1970 and other round numbers — and your own. Time
- Z-Score Calculator Turn a raw value into a z-score, a percentile and normal-curve areas. Math
- Weighted Average Calculator Average numbers that don't count equally — grades, credits, blended rates. Math
- 2x2 Matrix Calculator Determinant, inverse, trace, eigenvalues, rank and type of any 2×2 matrix. Math
- Percentile Rank Calculator What percent of a dataset falls below any value — three conventions shown. Math
- Empirical Rule Calculator Apply the 68-95-99.7 rule to any mean and standard deviation. Math
- Geometric Mean Calculator Geometric mean of positive numbers — the right average for growth rates. Math
- Typography Normalizer Turn straight quotes, double hyphens and ... into curly quotes, em dashes and ellipsis. Text
- Zero-Width Character Cleaner Find and strip invisible zero-width characters (U+200B, U+200C, U+200D, U+2060, U+FEFF). Text
- Duplicate Word Finder Catch accidentally repeated words like “the the” and see which words you overuse. Text
- Unix Permissions Calculator Convert chmod modes both ways: octal like 755 ↔ symbolic like rwxr-xr-x. Developer
- Semver Comparator Parse, compare and sort semantic versions with correct prerelease precedence rules. Developer
- Steps to Calories Calculator Turn any step count into distance, walking time, and calories burned from stride, weight, and pace. Health
- Caffeine Half-Life Calculator See how much caffeine is still in your system and when it drops below your cutoff threshold. Health
- Credit Utilization Calculator Per-card and overall credit utilization percentages, score-friendly bands, and paydown targets. Finance
- Subscription Cost Audit List every subscription with its billing cycle and see the true monthly and annual cost of the stack. Finance
- Byte Size Formatter Format any byte count as a human-readable size in SI (KB = 1000) and binary IEC (KiB = 1024) at once. Developer
- Wallpaper Roll Calculator Work out how many rolls of wallpaper a wall needs from area, roll size, and pattern repeat — strips planned, not guessed. Home & DIY
- Flooring Calculator Convert a room's floor area into planks and boxes, with a waste factor for cuts, defects, and the plank you'll need in three years. Home & DIY
- BTU Room Sizing Calculator Size a heater or air conditioner for one room: BTU per hour from floor area, ceiling height, insulation, sun, occupants, and climate. Home & DIY
- Fence Calculator Turn a perimeter length into fence posts, panels, rails, and gate bays — with the closed-loop corner math done for you. Home & DIY
- Grass Seed Calculator Weigh your lawn, not your guess: seed for new lawns or overseeding, plus fertilizer product from its nitrogen percentage. Home & DIY
- Mulch Coverage Calculator Turn bed area and depth into cubic yards, cubic feet and exact bag counts for mulch, soil or gravel. Home & DIY
- Deck Board Calculator Count deck boards, joists and screws from deck size, board width, gap and joist spacing. Home & DIY
- Insulation Batt Calculator Size batts or rolls for a wall or attic from area, R-value and stud spacing. Home & DIY
- Drywall Sheet Calculator Sheets of drywall for a room from dimensions, ceiling, doors and windows — plus screws. Home & DIY
- Stair Stringer Calculator Risers, treads, run, stringer length and angle from total rise — with the comfort check. Home & DIY
- Wind Chill Calculator NWS wind chill from air temperature and wind speed, in °F and °C, with frostbite-time bands. Weather
- Heat Index Calculator NWS heat index (Rothfusz regression) from temperature and humidity, with caution-to-danger bands. Weather
- Cloud Base Calculator Estimate convective cloud base height from temperature and dew point, in feet and meters. Weather
- Snow Load Calculator Roof snow load from snow depth and snow type, in psf, kg/m² and kPa — plus total weight. Weather
- Rainwater Harvesting Calculator Roof area × rainfall → harvestable water in liters and gallons, adjusted by roof surface type. Weather
- Dew Point Calculator Turn air temperature and relative humidity into the dew point with the Magnus formula, plus a comfort read. Weather
- Beaufort Scale Calculator Convert wind speed to Beaufort force 0–12 and back, with the sea state, land signs and wave heights. Weather
- Degree Days Calculator Sum heating and cooling degree days from daily mean temperatures against any base temperature. Weather
- Wet-Bulb Temperature Calculator Compute the Stull wet-bulb temperature from air temperature and humidity, with a heat-stress band. Weather
- Storm Distance Calculator Count the seconds from lightning flash to thunder and get the storm's distance plus 30/30 safety guidance. Weather
- BPM Delay Calculator Turn any BPM into tempo-synced delay and reverb times: straight, dotted and triplet note values in milliseconds. Music
- Note Frequency Calculator Convert any note and octave to its exact frequency in Hz under equal temperament, with MIDI numbers and cents offsets. Music
- Tap Tempo Calculator Tap along with a beat to find its BPM — averaged intervals, median BPM and a steadiness read on your taps. Music
- Tone Generator Play a pure tone in your browser by note or frequency — sine, square, sawtooth or triangle, 20 Hz to 20 kHz. Music
- Playback Speed Calculator See how long a podcast, lecture or audiobook takes at 1.25x, 1.5x, 2x — new duration plus time saved at every speed. Music
- Chord Transposer Transpose chord progressions up or down in semitones, with correct sharp/flat spelling and capo shapes. Music
- Camelot Wheel Calculator Convert any key to its Camelot code (8A, 8B…) and list the harmonically compatible keys around it. Music
- Set Time Calculator Total a DJ or live set: paste track lengths, add transition gaps, and get the exact running time. Music
- Sample Length Calculator Convert bars at a BPM into seconds, milliseconds and samples — or turn a length in seconds back into bars. Music
- Audio Bitrate Calculator Convert bitrate and duration into file size (and back), with per-minute and per-hour storage estimates. Music
- Test Grade Calculator Convert points earned out of points possible into a percentage and letter grade, on standard or custom scales. School & Study
- Cumulative GPA Calculator Combine every semester into one credit-weighted GPA — enter each term’s GPA and credit hours on its own line. School & Study
- Study Time Splitter Split your daily study hours across subjects by exam date — the nearest deadline gets funded first. School & Study
- Class Hour Cost Calculator Turn tuition and fees into a cost per contact hour, per credit, and per course — what one lecture really costs. School & Study
- GPA Scale Converter Convert a grade between a percentage, the 4.0 scale, UK honours classes and ECTS in one step. School & Study
- Attendance Percentage Calculator Check your attendance percentage and see exactly how many more classes you can afford to miss. School & Study
- Spaced Repetition Planner Turn the 1-3-7-16-35-day review ladder into a dated review schedule for everything you are learning. School & Study
- Grade Curve Calculator Curve a list of scores with a flat add, a linear rescale or a top-score adjustment — before and after stats included. School & Study
- Assignment Late Penalty Calculator Apply a late-work policy — per-day penalty, grace days, floor and cutoff — to any submitted score. School & Study
- Meat Cook Time Calculator Estimate oven time and rest time for meat by weight, with USDA-safe internal temperatures. Food & Cooking
- Freezer Thaw Time Calculator Estimate fridge and cold-water thawing times by weight, based on USDA food-safety guidance. Food & Cooking
- Pan Size Converter Scale a recipe when you swap round, square, rectangular, springform or loaf pans. Food & Cooking
- Alcohol Dilution Calculator Get the new ABV after adding water, or the exact water needed to hit a target proof. Food & Cooking
- Rice & Pasta Ratio Calculator Water ratios, cook times and rest times for rice, grains and pasta, scaled to your amount. Food & Cooking
- Dog Age Calculator Convert dog years to human years by breed size — small, medium, large or giant — not the ×7 myth. Pets
- Cat Age Calculator Convert your cat's age to human years and see the life stage: kitten, junior, prime, mature, senior or geriatric. Pets
- Chocolate Toxicity Calculator Estimate the theobromine dose in mg/kg from the chocolate type and amount eaten, and see the risk band for your pet's weight. Pets
- Aquarium Volume Calculator Tank dimensions to liters and gallons, with filled water weight and US vs imperial gallons. Pets
- Pet Annual Cost Calculator Add up food, vet, insurance, grooming and supplies to see the true annual, monthly and lifetime cost of a pet. Pets
- Pet Food Portion Calculator Turn your pet's weight and food calories into daily grams and per-meal amounts. Pets
- Dog Gestation Calculator Mating date to due date: 63-day canine gestation with the 58–68 day window. Pets
- Pet Sitter Cost Calculator Total sitting bill: visits × rate × days, plus overnights, surcharge and travel. Pets
- Aquarium Heater Wattage Calculator Tank size + temperature rise → heater watts via the 2.5–5 W/gallon rule. Pets
- Puppy Adult Weight Calculator Puppy age + weight + breed size → projected adult weight and growth range. Pets
- Ohm's Law Calculator Enter any two of voltage, current, resistance and power — the other two are solved instantly. Science & Physics
- Density Calculator Mass and volume in, density out — g/cm³, kg/m³ and lb/ft³ at once, with a floats-or-sinks check. Science & Physics
- Molarity Calculator Moles or mass with molar mass, plus solution volume — molarity in M, mM and µM at once. Science & Physics
- Half-Life Calculator What remains after any elapsed time: percent left, amount decayed, decay constant and more. Science & Physics
- Free Fall Calculator Drop height, fall time and impact velocity — enter one, get the others (g = 9.81, no drag). Science & Physics
- Dilution Calculator Solve C1V1 = C2V2 for any missing value when diluting a stock solution to a working strength. Science & Physics
- Projectile Motion Calculator Launch speed and angle give range, max height and flight time — the classic no-drag projectile equations. Science & Physics
- Ideal Gas Law Calculator Solve PV = nRT for any missing variable, with pressure, volume, moles and temperature unit options. Science & Physics
- Molar Mass Calculator Type a chemical formula — H2O, CuSO4·5H2O, Ca(OH)2 — and get its molar mass with a full element breakdown. Science & Physics
- Wavelength & Frequency Calculator Convert wavelength, frequency and wave speed for light (c) and sound (343 m/s), plus photon energy E = hf. Science & Physics
- Late Fee Calculator Calculate an invoice late fee — flat or percent per month/year — after a grace period, with the annualized rate. Business
- Customer Lifetime Value Calculator Estimate customer lifetime value from order value, frequency, margin and lifespan — with a CLV:CAC read. Business
- Churn Rate Calculator Convert customers lost into churn and retention rates, annualized churn, and average customer lifetime. Business
- Runway & Burn Rate Calculator Turn cash and monthly burn into months of runway, with the gross vs net burn distinction and a status read. Business
- Freelance Rate Calculator Turn a target salary into an hourly and day rate, accounting for billable share, overhead and taxes. Business
- CPM Calculator Calculate CPM from ad spend and impressions, plus CPC, CTR and CPA when you add clicks and conversions. Business
- Commission Calculator Compute sales commission at a flat or tiered rate, with the effective rate and take-home pay including base salary. Business
- ROAS Calculator Calculate return on ad spend from revenue and ad cost, with the break-even ROAS your gross margin demands. Business
- Utilization Rate Calculator Turn billable and total hours into a utilization rate, then price the billable capacity and the idle hours. Business
- Net Terms Due Date Calculator Add Net 15/30/60/90 or EOM terms to an invoice date to get the exact due date and days remaining. Business
- Coffee Ratio Calculator Get the coffee:water ratio right for any brew — espresso, pour-over, French press or cold brew — in either direction. Food & Cooking
- Sourdough Hydration Calculator Work out dough hydration from flour, water and your starter — and see the water needed to hit a target %. Food & Cooking
- Oven Temperature Converter Convert oven temperatures between °F, °C and UK gas marks, with the fan-assisted setting for each. Food & Cooking
- Drinks Per Guest Calculator Plan drinks for a party: guests × hours × pace → beer, wine, spirits, soft drinks, ice and cups to buy. Food & Cooking
No matches yet.
Try a different word or pick another topic.
THE FIELD GUIDE
Not just the answer.
The “why”, too.
Plain-English explanations, worked examples, and a little more understanding. One guide for every tool.
Find your next lightbulb momentlooks good
on you.