Factorial Calculator
The factorial n! multiplies all integers from 1 to n. Useful in probability and combinatorics.
Calculator
Factorial Calculator
Result
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Formula
n! = n × (n−1) × … × 1
Step-by-step
- 1
Enter n
Any integer 0 or more.
- 2
Read the result
Note: 0! is defined as 1.
Worked example
Example input: n: 5
Result: 120
Related tools
- Permutation Calculator
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- Combination Calculator
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