Math

Factorial Calculator

Calculate factorials, permutations (nPr), and combinations (nCr).

n! Factorial

0! = 1 · Max: 170! before overflow

Permutations nPr

Combinations nCr

Factorial Table (1–20)

${Array.from({length:20},(_,i)=>{let f=BigInt(1);for(let j=2;j<=i+1;j++)f*=BigInt(j);return`

${i+1}!${f.toLocaleString()}

`;}).join('')}