Factorial Calculator
Calculate factorials up to 500! with exact BigInt precision, see digits, trailing zeros, scientific notation, and explore nPr/nCr combinatorics on the same page.
Supports exact results up to 500! (7 digits).
Enter a second value to explore permutations and combinations of n objects taken r at a time.
0 ≤ r ≤ n
Adjust how much of the full factorial we render below. This does not affect the precision of calculations.
Digits in n!
7
2 trailing zeros
n! (scientific)
3.62880 × 10^6
Useful when the exact value is too long to read
ln(n!)
15.104413
Natural logarithm of the factorial
log₁₀(n!)
6.559763
Base-10 logarithm
Exact value of n!
Full precision factorial result. Large numbers are automatically grouped for readability.
Combinatorics
n = 10
r = 3
Permutations nP3
720
3 digits
Combinations nC3
120
3 digits
Permutations count ordered arrangements; combinations count unordered selections.