Percentage Calculator
Find a percentage of a number, including the result after adding or subtracting it.
Math
4 free tools
Math calculators
From percentages and fractions to equations and statistics.
Choose your problem type and enter values to see a result with its formula and assumptions. Use the examples to check your understanding, then export or print your result if needed. Numbers are rounded for display while calculations use unrounded values.
Fraction Calculator
Add, subtract, multiply or divide two fractions and simplify the result.
Math
Quadratic Equation Calculator
Solve ax² + bx + c = 0 and identify the type of roots.
Math
Statistics Calculator
Find the mean, median, range and standard deviation of a list of numbers.
Math
Before you start
- Distinguish a percentage of a number from the percentage change between two numbers.
- In statistics, interpret standard deviation according to whether your data represent a whole population or a sample.
- A fraction cannot have a zero denominator, and you cannot divide by a fraction whose value is zero.