Math Calculators
Math calculators solve the everyday arithmetic and algebra problems that show up in schoolwork, shopping, cooking, and budgeting. Each one shows the formula and a worked example so you can check the method, not just the answer.
- Percentage CalculatorFind what a percentage of a number is, what percent one number is of another, and the percentage change between two values.
- Percentage Increase CalculatorCalculate the percentage increase from a starting value to a new value, or apply an increase directly.
- Percentage Decrease CalculatorCalculate the percentage decrease between two values, or reduce a number by a given percentage.
- Average CalculatorCalculate the arithmetic mean of a set of numbers, along with the count, sum, minimum, and maximum.
- Fraction CalculatorAdd, subtract, multiply, and divide fractions, with results simplified to lowest terms and shown as mixed numbers.
- Ratio CalculatorSimplify a ratio to its lowest terms and see the equivalent proportion per unit.
- Exponent CalculatorRaise any base to any power, including negative and fractional exponents.
- Square Root CalculatorFind the square root of any non-negative number, and check whether it is a perfect square.
- Quadratic Equation CalculatorSolve ax² + bx + c = 0 with the quadratic formula, including the discriminant and complex roots.
Related guides
- How to Calculate a PercentageThe three basic percentage problems and the one idea that solves all of them.
- How to Calculate Percentage Increase (and Decrease)The change formula, why the base matters, and the trap of reversing percentages.
- Percentage Difference vs. Percentage ChangeTwo similar-sounding measures that answer different questions — and how to choose correctly.
- How to Calculate an AverageMean, median, and mode — what each one tells you and when the mean misleads.