Factorial Calculator Online
Compute n! (n factorial) for any non-negative integer. Free.
Factorial calculator
The factorial of n (n!) is the product of all positive integers from 1 to n. Example: 5! = 5 × 4 × 3 × 2 × 1 = 120. By definition, 0! = 1.
Frequently Asked Questions
What is a factorial?
The factorial of a non-negative integer n, written n!, is the product of all positive integers from 1 to n. For example 5! = 5×4×3×2×1 = 120.
What is 0!?
By definition, 0! = 1.
Related
Cite This Calculator
Reference this calculator on your website or in your work using the citation below:
HTML Citation Code:
<p>Calculator: <a href="https://onlinecalculator.co.uk/math/factorial-calculator" target="_blank">Factorial Calculator Online</a> - OnlineCalculator.co.uk</p>APA Style Citation:
OnlineCalculator.co.uk. (2025). Factorial Calculator Online. Retrieved from https://onlinecalculator.co.uk/math/factorial-calculatorNote: This calculator is free to use and reference. No permission required for educational or commercial citation.