Factorial Calculator
Compute the factorial n! for large numbers at full precision (BigInt). Enter your values, click Calculate, and get the full result with its breakdown — everything is processed on your device, nothing is sent to a server.
All calculations run in your browser. Your data is never sent to our servers.
Example
Example Input
20
Example Output
2432902008176640000
How to Use
- 1Fill in each input field with the values you want to compute.
- 2If there are choices (units, mode, operation), pick what you need.
- 3Click the Calculate button (or press Ctrl+Enter).
- 4The main result and its breakdown appear in the Result area. Click Copy to copy it.
About the Factorial Calculator
The Factorial Calculator computes n! = 1 × 2 × … × n using BigInt, so even large numbers are shown exactly (factorials grow extremely fast). The digit count of the result is also shown.
Useful for combinatorics, probability, and series.
FAQ
Is this Factorial Calculator accurate?
Yes. It uses standard formulas and runs directly in your browser at full JavaScript precision (plus BigInt/decimal.js for large numbers where needed).
Is my data sent to a server?
No. All calculations happen entirely on your device. No values are sent to or stored on our servers.