# Factorial calculator: Calculate n! online

The F command calculates the factorial such as 5!. 5! (5 factorial) means 1 × 2 × 3 × 4 × 5 and its value is 120. If you input F 5 in the search form above, the page outputs 120 as follows.

This calculator shows an error if input a non-integer value like 5.1 or 3/8.