Mathlean · Online math workspace
Factorial calculator
Multiply the positive integers up to a nonnegative integer.
How to use this calculator
Replace 8; eight factorial is 40320. Zero factorial is 1.
Tap the math below to edit it and see the result. Once a result is ready, press Tab on a hardware keyboard to accept it. Outside a matrix, Return completes the line; the phone math keyboard has the same Return action.
Try it here
Interactive tools require JavaScript. You can read the guide and example without it.
What to know
Factorials grow quickly. The Gamma extension is a different operation at noninteger inputs.
Mathlean combines visual mathematical input with computation and canvas tools. Results depend on the expression and available engine support; check important answers independently.