Math Tools
Need 15% off a price, a fraction as a decimal, or the area of a triangle? These calculators handle the everyday math that is easy to get wrong by hand — percentages, fractions, statistics and geometry. Type in your numbers and get the worked answer immediately, with no sign-up and nothing to install.
27 tools, ready when you are
- 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
- Triangle Area Calculator Find the area of a triangle from base and height or from three sides (Heron's formula). Math
- Significant Figures Calculator Count significant figures in any number and round it to N significant figures. Math
- 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
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