Calculate Factorials (n!) Online
Compute the factorial of any number instantly. Also calculate permutations, combinations, double factorials, and subfactorials for math and statistics.
Number Factorial Calculator
Calculate factorial, double factorial, permutations, and combinations
Formulas
n! = n × (n-1) × ... × 1
5! = 5 × 4 × 3 × 2 × 1 = 120
n!! = n × (n-2) × (n-4) × ...
5!! = 5 × 3 × 1 = 15
P(n,r) = n! / (n-r)!
P(5,3) = 5! / 2! = 60
C(n,r) = n! / (r! × (n-r)!)
C(5,3) = 5! / (3! × 2!) = 10
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