Factorial Calculator
Math CalculatorsCalculate the factorial (n!) of any non-negative integer.
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About This Tool
Find the product of all positive integers up to n. Essential for probability, combinations, and permutations.
Frequently Asked Questions
A factorial (denoted as n!) is the product of all positive integers less than or equal to n. For example, 4! = 4 × 3 × 2 × 1 = 24.
By mathematical convention, 0! is equal to 1. This is consistent with rules for permutations and combinations.
Standard JavaScript number types reach "Infinity" after 170! because the result exceeds the maximum value for a 64-bit float.
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