Factorial Calculator
Calculate n! for whole numbers up to 170 exactly. The result updates as you type, with the working underneath so you can check it.
Your details
Result
10!
3,628,800
- Digits
- 7
Good to know: n! = n × (n−1) × … × 1
About this tool
Formula
n! = n × (n−1) × … × 1
Questions people ask
Why is 0! equal to 1?
By convention, which keeps formulas such as combinations consistent: there is exactly one way to arrange nothing.
Related tools
- GCD and LCM CalculatorFind the greatest common divisor and least common multiple of two or more numbers.
- Prime Factorization CalculatorBreak a number into prime factors and count its divisors.
- Fraction CalculatorAdd, subtract, multiply and divide fractions with simplified results.
- Ratio CalculatorSolve proportions and simplify ratios.
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators