Calculator categories
Math
Percentages, fractions, roots, equations, trigonometry. 6 free calculators with the formula, worked examples, and FAQ on every page. All math runs in your browser — nothing is sent to a server.
Percentage calculator
Four modes: X% of Y, X is what % of Y, % change, value after adding/subtracting a %
Fraction calculator
Add, subtract, multiply, divide two fractions — fully simplified result with decimal equivalent
Square root / nth root calculator
Compute the square, cube, or any nth root of a number — with perfect-root detection
Speed, distance, time calculator
Solve for any one of speed, distance, or time given the other two
Quadratic equation solver
Solve ax² + bx + c = 0 with discriminant, real or complex roots
Scientific notation converter
Standard ↔ scientific ↔ engineering notation, with order-of-magnitude breakdown