MATH
Factorial Calculator
Calculate the exact factorial of a non-negative whole number.
Your result
MATHEnter your values and select calculate.
On this page How it works & practical examples
How to use the Factorial Calculator
The factorial counts ordered arrangements of n distinct items. The output is an exact integer string; the digit count helps assess very large results.
The calculation
n! = 1 × 2 × … × n; 0! = 1
Worked example
10! is 3,628,800; 0! and 1! both equal 1.
Assumptions and limits
Supports up to 500 to keep output manageable. It does not evaluate the gamma function or factorials of non-integers.
Common questions
Which inputs should I use?
The factorial counts ordered arrangements of n distinct items. The output is an exact integer string; the digit count helps assess very large results.
What does the result exclude?
Supports up to 500 to keep output manageable. It does not evaluate the gamma function or factorials of non-integers.