Factorial Calculator
Exact factorials of large numbers using big integers.
20!
2432902008176640000
Digits
19
ShowHide the working
- 120! = 20 × 19 × … × 2 × 1
Formula
n! = n × (n−1) × … × 1How it works
The exact factorial of a number, using big integers so even large factorials are precise.
Example
20! = 2,432,902,008,176,640,000.
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About the Factorial Calculator
Exact factorials of large numbers using big integers. It sits in the Math & Algebra section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Factorial Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Factorial Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Factorial Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Math & Algebra?
- Equations, fractions, primes, roots, sequences and number theory. You can browse the full Math & Algebra category for related calculators.