n!
Factorial Calculator
Compute n! for any non-negative integer up to 170. Uses BigInt for arbitrary precision; supports double factorial and Stirling approximation.
MATHCompute n! for any non-negative integer up to 170. Uses BigInt for arbitrary precision; supports double factorial and Stirling approximation.
Detailed instructions, formula notes, and US-context guidance shown in the calculator above.
Disclaimer: Estimate only. Consult a qualified professional for decisions with major financial, legal, or health consequences.
Factorial Calculator
Compute n! for any non-negative integer up to 170. Uses BigInt for arbitrary precision; double factorial n!! and Stirling approximation also shown.
10!
3628800
Double factorial n!!3840
Stirling approximation3.5987e+6
n! grows extremely fast: 10! = 3.6 million; 20! ≈ 2.4×10¹⁸; 70! exceeds googol; 170! ≈ 7×10³⁰⁶ (near JS Number max).
Frequently Asked Questions
What is the Factorial Calculator for?
Compute n! for any non-negative integer up to 170. Uses BigInt for arbitrary precision; supports double factorial and Stirling approximation.
How do I use the Factorial Calculator?
Detailed instructions, formula notes, and US-context guidance shown in the calculator above.
How accurate are my factorial results?
Estimate only. Consult a qualified professional for decisions with major financial, legal, or health consequences.
Is the Factorial Calculator free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.