Math Calculators
Percentage, fraction, and other calculators for everyday and advanced math.
- Percentage CalculatorFind a percentage of a number, what percent one number is of another, percentage change, or increase and decrease a value by a percent.
- Fraction CalculatorAdd, subtract, multiply, and divide fractions and mixed numbers, simplify to lowest terms, and convert between fractions and decimals.
- Scientific CalculatorEvaluate scientific expressions with sin, cos, tan, logs, powers, roots, factorial, and π — in degrees or radians.
- Standard Deviation CalculatorCalculate population or sample standard deviation, variance, mean, SEM, and confidence-interval error bars from a list of numbers.
- Mean, Median, Mode, Range CalculatorFind the mean, median, mode, range, and geometric mean of a comma-separated list of numbers.
- Triangle CalculatorSolve any triangle from three parts (SSS, SAS, ASA/AAS, or SSA). Get sides, angles, area, heights, medians, inradius, circumradius, and triangle type.
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 with the quadratic formula. Enter decimals or fractions; get real or complex roots and optional worked steps.
- Pythagorean Theorem CalculatorSolve a² + b² = c² for any missing side of a right triangle. Enter two of a, b, and c (plain lengths or under a square root) to get the third side, angles, area, perimeter, and height.
- Circle CalculatorFind the radius, diameter, circumference, and area of a circle from any one value. Uses D = 2R, C = 2πR, and A = πR².
- Slope CalculatorFind the slope of a line from two points, or find the second point from one point, a distance, and the slope or incline angle. Get θ, distance, intercepts, and the line equation.
- Random Number GeneratorGenerate random integers or decimals in your browser. Inclusive range, optional unique draws and sorting — a pseudo-random generator, not for cryptography.