Factorial Calculator
𝑥 Algebra. Use the Factorial formula to find n!, n: pick the value you want, type the others, and the answer updates as you go.
n!120
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| n! | no unit |
| n | no unit |
Worked example
Find the n! when n = 5.
Using n! = n × (n-1) × … × 2 × 1: n! = 120.
Frequently asked questions
What is the formula for Factorial?
n! = n × (n-1) × … × 2 × 1.
What do the letters stand for, and what units are used?
n!, n.
How do you calculate n!?
Put the values into n! = n × (n-1) × … × 2 × 1. For example, with n = 5, n! = 120.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (n!, n) and fill in the others: it rearranges the formula for you.
