Free online factorial calculator. Calculate the factorial (n!) of any positive integer. Great for math learning, permutation and combination calculations. No signup required.
Zero dependencies · Works offlineFree online factorial calculator. Calculate the factorial (n!) of any positive integer. Great for math learning, permutation and combination calculations. No signup required.
Factorial, denoted n!, equals 1×2×3×...×n. For example: 5! = 5×4×3×2×1 = 120. By convention, 0! = 1.
Factorials are widely used in permutations and combinations, probability theory, Taylor series, and algorithm complexity analysis.
This tool supports 0 to 1000. Results beyond 170! are extremely large but can be precisely calculated using BigInt.