Factorial Calculator
Calculate the factorial of a number (n!). Supports large numbers.
Last updated: 2/3/2026
The factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n.
Calculator Inputs
Results
Enter values above to see your results
How It Works
Enter an integer. We multiply n × (n-1) × (n-2) ... × 1.
Worked Examples
Calculate 5!
Sequence:
5 × 4 × 3 × 2 × 1= MultiplyResult:
120= 120Tips & Best Practices
- •0! is defined as 1.
- •Factorials grow very quickly. 100! has 158 digits!
Frequently Asked Questions
What is 0! ?
By definition, 0! = 1.
Related Calculators
Linear Interpolation Calculator
Find a value between two known points using linear interpolation formula.
30 seconds
Absolute Value Calculator
Find the absolute value (magnitude) of any number. |x|
5 seconds
Cube Root Calculator
Calculate the cube root of any number (∛x).
5 seconds
Percentage Calculator
Calculate percentages, percentage of a number, percentage increase/decrease, and more
30 seconds