Factorial Calculator
Compute n! for large numbers using BigInt.
Amortization schedule
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Showing first 12 of months.
Growth over time
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Introduction
Factorial Calculator — Compute n! for large numbers using BigInt. Enter n to get an instant, accurate result.
Formula
n! = n × (n−1) × (n−2) × … × 1, computed with arbitrary-precision arithmetic for exact results.
Step-by-step
- Enter the n.
- Click Calculate to see your result instantly.
Real-world example
Example: With n = 10, the Factorial Calculator gives Factorial: 3628800.
Frequently Asked Questions
What is 0!?
0! is defined as 1.
How large a factorial can I compute?
Up to 500! — beyond that the result is not returned.
What inputs does the Factorial Calculator need?
You'll need to provide: n. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Factorial Calculator?
The Factorial Calculator applies the formula exactly as calculated — n! = n × (n−1) × (n−2) × … × 1, computed with arbitrary-precision arithmetic for exact results. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Factorial Calculator free to use?
Yes, the Factorial Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Factorial Calculator
The Factorial Calculator uses a real, verifiable formula — n! = n × (n−1) × (n−2) × … × 1, computed with arbitrary-precision arithmetic for exact results. — so results are accurate every time, not an approximation.