Math Calculators

Free math calculators for percentages, fractions, scientific operations, statistics, and geometry. Step-by-step results you can check.

• Scientific CalculatorA full scientific calculator supporting trigonometry, logarithms, exponents, and factorials. Type a whole expression or use the keypad, and switch between degrees and radians.
• Percentage CalculatorFive percentage tools in one place, each showing the working: find a percentage of a number, express one number as a percentage of another, calculate percentage change, work backwards from a percentage, and measure the percentage difference between two values.
• Fraction CalculatorAdd, subtract, multiply, or divide two fractions or mixed numbers, simplify a fraction, or convert a decimal to a fraction — and see the result in lowest terms, as a mixed number, as a decimal and as a percent, with the working behind each step.
• Standard Deviation CalculatorPaste a data set to get the standard deviation, variance, mean, median, and range, with the choice between sample and population formulas and the working shown.
• Random Number GeneratorGenerate one or many random numbers within any range, with an option to exclude repeats. Numbers are drawn from your browser's cryptographic random source.
• Triangle CalculatorEnter any three values of a triangle — sides, angles or a mix, with at least one side — to solve every side and angle, the area, perimeter, heights, inradius and circumradius, with the law of sines or cosines worked through and the ambiguous case reported.