Factorial Calculator
n!, permutations, combinationsRuns locally · nothing uploaded
- n! (factorial)2432902008176640000
- Scientific notation2.432902008 × 10^18
- Digits19
- Trailing zeros4
- Permutations P(n, r) = n! / (n−r)!6840
- Combinations C(n, r) = n! / (r!(n−r)!)1140
Also works as:nPr calculatornCr calculatorcombinations calculator
How to use
- 1Enter n.
- 2Optionally enter r for permutations and combinations.
- 3Read the exact results.
FAQ
What is 0 factorial?
0! = 1 by definition, which keeps the permutation and combination formulas consistent.
Permutations vs combinations?
Permutations count order, combinations do not. Choosing 3 of 5 people in order: P(5,3) = 60; as a group: C(5,3) = 10.
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