Free tools
Free Math & Measurement Tools
Solve expressions and equations, analyse averages and data spread, calculate percentages and fractions, or convert units.
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Search this category by task or name, such as Area Calculator.
Area Calculator
Calculate rectangle, circle, triangle and trapezoid areas in metric or imperial units. Compare square metres, square feet, hectares and acres, then save the result.
Open tool →Ratio Calculator
Simplify a two-part ratio, scale it to a new first value and see each part as a percentage of the whole. Supports positive decimals with clear worked examples.
Open tool →GCF and LCM Calculator
Find the greatest common factor and least common multiple of two or more whole numbers. Get exact integer results and a reduced ratio, with no sign-up.
Open tool →Unit Converter
Convert length, mass, temperature, area, volume, speed and storage units. Swap direction, compare units and distinguish US, Imperial, decimal and binary measures.
Open tool →Percentage Calculator
Find a percentage of a number, percentage change, or an amount after an increase or discount. Clear formulas, examples and private printable results.
Open tool →Fraction Calculator
Add, subtract, multiply or divide fractions and mixed numbers. Get an exact simplified fraction, mixed number, decimal estimate and the calculation steps.
Open tool →Average Calculator
Find the mean, median, mode, range, sum and count of a number list. Paste numbers from a spreadsheet, compare clear statistics and copy or print the results.
Open tool →Scientific Calculator
Calculate expressions with powers, roots, trigonometry, logarithms and factorials. Use a touch-friendly keypad, choose degrees or radians, and copy or print results.
Open tool →Standard Deviation Calculator
Calculate sample and population standard deviation, variance and mean. Paste a list, compare both conventions and see the calculation with private printable results.
Open tool →Quadratic Formula Calculator
Solve ax² + bx + c = 0 with real or complex roots. See the discriminant, vertex, symmetry axis and method, including linear equations when a is zero.
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