Factorial Calculator
Calculate factorial (n!) for numbers 0-170. View scientific notation for large numbers. Compute permutations (nPr) and combinations (nCr).
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How to Use the Factorial Calculator
- Enter a non-negative integer (0-170) in the n field.
- Optionally enter r to calculate permutations P(n,r) and combinations C(n,r).
- Click Calculate to compute.
- View the full result, scientific notation, and digit count.
What is Factorial?
The factorial of a non-negative integer n (written as n!) is the product of all positive integers less than or equal to n. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120. By convention, 0! = 1.
Features
- Supports 0 to 170 (JavaScript number limit)
- Scientific notation for large results
- Digit count for the result
- Permutations P(n,r) and Combinations C(n,r)
- Reference table for common factorials
- 100% client-side processing
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Disclaimer: This tool is provided as-is for informational and educational purposes only.