Factorial Calculator
Calculates n factorial up to 170.
Result
- n!
- 3,628,800
How to use the factorial calculator
- Enter the n.
- The results update as you type, or press Calculate.
- Read the n! first, then the supporting figures below it.
Formula
n! = 1 × 2 × … × n.
Worked example
For example, with these inputs:
- n: 10
the calculator returns:
- n!: 3,628,800
Background
Each formula has assumptions built in. Area formulas assume flat shapes, volume formulas assume regular solids and statistical measures assume the data you enter is the data you want to describe. Knowing the assumptions helps you pick the right tool.
In everyday life the same maths shows up in discounts, recipe scaling, renovation measurements and comparing prices per unit. Being comfortable with it saves money and avoids costly measuring mistakes.
Frequently asked questions
How does the factorial calculator work?
It applies this formula: n! = 1 × 2 × … × n.
Can I use any units?
Yes, as long as every input uses the same unit. The answer will be in that unit (squared for areas, cubed for volumes).