ultraquick.tools — Free Online Tools, Calculators & Converters

Time

Age Calculator

Calculate exact age in years, months, days from a birth date.

Time

Date Difference Calculator

Calculate the number of days, weeks, and months between two dates.

Time

Time Zone Converter

Convert a date and time between any two time zones.

Time

Leap Year Checker

Check whether any year is a leap year.

Time

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

Date Adder

Add or subtract days, weeks, months, and years from a date.

Time

Pomodoro Timer

Plan and run a Pomodoro session: focus blocks with short and long breaks, plus a live countdown.

Time

Date Countdown

Count the days, weeks, months and years until or since a target date.

Time

Focus Timer

A simple countdown focus timer with start, pause and reset — and an optional end-time estimate.

Time

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.

Health

BMI Calculator

Body Mass Index calculator with metric & imperial units.

Health

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

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

Pace Calculator

Calculate running pace, speed, and finish time from distance and time.

Health

Sleep Cycle Calculator

Find the best bedtime or wake-up time based on 90-minute sleep cycles.

Health

Blood Alcohol Content (BAC) Estimator

Estimate your blood alcohol content (BAC) from drinks, weight, sex, and time.

Health

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

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

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

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.

Math

Percentage Calculator

Percentage of a number, percent change, increase/decrease.

Math

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

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

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

Decimal to Fraction Converter

Convert any decimal to a simplified fraction.

Math

Fraction Simplifier

Reduce a fraction to its simplest form.

Math

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

Probability Calculator

Compute probabilities for coins, dice, and drawing without replacement.

Math

GPA Calculator

Calculate your grade point average on a 4.0 scale from courses and credit hours.

Math

Triangle Area Calculator

Find the area of a triangle from base and height or from three sides (Heron's formula).

Math

Paint Calculator

Estimate how much paint you need for a room from its dimensions, the number of coats, and the paint coverage.

Math

Tile Calculator

Calculate how many tiles you need from the floor or wall area, tile size, and a waste allowance.

Text

Word Counter

Count words, characters, sentences and reading time.

Text

Case Converter

Convert text to uppercase, lowercase, title case, camelCase, and more.

Text

Number to Words

Convert any integer to its English word representation.

Text

Text Reverser

Reverse text by characters, words, or lines instantly.

Text

Character Counter

Count total characters, unique characters, and frequency of each character.

Text

Morse Code Translator

Translate text to Morse code and Morse code back to text.

Text

Pig Latin Translator

Translate English text into Pig Latin.

Text

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

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

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

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

Letter Frequency Counter

Count how often each letter appears in text — for frequency analysis and cipher-breaking.

Text

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

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

Number to Words (Currency)

Convert a number into currency words for check writing — dollars and cents, euros, pounds or yen.

Generators

QR Code Generator

Create QR codes for links, text, Wi-Fi and more.

Generators

Lorem Ipsum Generator

Generate placeholder Lorem Ipsum text for designs and mockups.

Generators

Random Number Generator

Generate random numbers within a range using cryptographic randomness.

Generators

UUID Generator

Generate random UUID v4 identifiers instantly in your browser.

Generators

Hashtag Generator

Generate relevant hashtags from your text for social media posts.

Generators

Dice Roller

Roll any number of dice with any number of sides.

Generators

Lottery Number Generator

Generate random lottery numbers from a range.

Generators

Randomizer

Shuffle a list into a random order or pick N random items. Dedupe option.

Generators

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.

Converters

Length Converter

Convert meters, feet, inches, miles, km and more.

Converters

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly.

Converters

Weight Converter

Convert between kilograms, pounds, ounces, grams, and more.

Converters

Data Size Converter

Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes.

Converters

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

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals to numbers.

Converters

Binary Converter

Convert between binary, octal, decimal, and hex.

Converters

Scientific Notation Converter

Convert between decimal and scientific notation.

Converters

Decimal to Percent Converter

Convert between decimals and percentages.

Converters

Fraction to Decimal Converter

Convert a fraction to a decimal and detect repeating cycles.

Converters

Pressure Converter

Convert between pascal, bar, atm, psi, mmHg and more.

Converters

Angle Converter

Convert between degrees, radians, gradians, and turns.

Converters

Cooking Converter

Convert between cups, tablespoons, teaspoons, ml, fl oz, pints, quarts, liters and gallons.

Converters

Base Converter

Convert numbers between any base from 2 to 36, including fractional values.

Converters

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.

Finance

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

Compound Interest Calculator

Calculate compound interest with optional regular contributions.

Finance

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

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

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

Retirement Calculator

Project your retirement savings and check a target.

Finance

Unit Price Calculator

Compare prices by computing the cost per unit.

Finance

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

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

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

Bill Splitter

Split a bill with tax and tip across any number of people.

Finance

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

Mortgage Payoff (Extra 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

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

Break-Even Calculator

Find the break-even point in units and revenue from fixed costs, price and variable cost.

Finance

Markup Calculator

Calculate a selling price from a unit cost and a markup percentage, with the profit margin shown side by side.

Finance

Invoice Generator

Create a printable invoice from line items with discount and sales tax, then print or save as PDF.

Finance

Markup vs Margin Calculator

Enter a cost and a selling price to see both the markup % and the profit margin % at a glance.

Finance

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

Meeting Cost Calculator

Estimate the cost of a meeting from attendee headcount, hourly rate and duration.

Finance

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

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.

Finance

Credit Card Validator

Validate a card number with the Luhn checksum and identify the issuing network.

Design

Color Converter

Convert between hex, RGB, and HSL color formats instantly.

Design

CSS Gradient Generator

Create CSS gradients (linear, radial, conic) with live preview.

Design

Hex to RGB Converter

Convert hex colors to RGB and HSL with a live swatch.

Design

CSS Box Shadow Generator

Generate CSS box-shadow with a live preview.

Design

Color Contrast Checker

Check WCAG color contrast between two colors.

Design

Aspect Ratio Calculator

Reduce width and height to a simple aspect ratio.

Design

Color Palette Generator

Generate complementary, analogous, triadic, tetradic, and monochromatic palettes from a base color.

Design

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

CSS Unit Converter

Convert CSS lengths between px, rem, em, pt, pc, in, cm, mm, vw, vh, and %.

Design

Color Picker

Pick a color and get hex, RGB, HSL codes plus a coordinating palette.

Security

Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 back to text instantly.

Security

Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly.

Security

JWT Decoder

Decode JSON Web Tokens and inspect header, payload, and expiry.

Security

Caesar Cipher

Encrypt and decrypt text with a Caesar (shift) cipher.

Security

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

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

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

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.

Developer

JSON Formatter

Format, validate, and beautify JSON with custom indentation.

Developer

URL Encoder & Decoder

Encode text for URLs or decode URL-encoded strings instantly.

Developer

Markdown to HTML Converter

Convert Markdown text to clean HTML instantly in your browser.

Developer

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

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

Cron Expression Generator

Generate cron expressions for scheduled tasks with human-readable descriptions.

Developer

Meta Tag Generator

Generate SEO meta tags, Open Graph, Twitter Cards, and JSON-LD schema.

Developer

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

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

CSS Minifier

Minify CSS by removing comments and whitespace.

Developer

JavaScript Minifier

Minify JavaScript by removing comments and whitespace.

Developer

HTML Minifier

Minify HTML by removing comments and whitespace.

Developer

SQL Formatter

Format and beautify SQL queries with indentation.

Developer

ASCII Text Converter

Convert text to ASCII codes and back.

Developer

Markdown Table Generator

Convert CSV, tab, pipe, or whitespace data into a GitHub-flavored markdown table.

Developer

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

Punycode Converter

Convert internationalized domain names (IDN) to Punycode (xn--) and back.

Developer

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

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

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 (Bidirectional)

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.

Reference

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.