Factorial Calculator
Calculate the factorial of any number (n!). Supports large numbers using BigInt.
Frequently Asked Questions
What is a factorial?
The factorial of n (written n!) is the product of all positive integers from 1 to n. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120. By definition, 0! = 1.
How large a factorial can this calculate?
This tool uses JavaScript BigInt, which can handle arbitrarily large factorials limited only by your device's memory.
What is 0 factorial?
0! = 1. This is defined by convention and is consistent with the combinatorial interpretation of factorials.
Is my data sent to a server?
No, all calculation is done entirely in your browser.
