What is the Factorial Calculator?
The factorial calculator is a free online tool that helps you work out factorial quickly and accurately. It uses the standard formula n! = n x (n-1) x ... x 1 and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter a whole number (0-170).
- See its factorial.
Formula used
n! = n x (n-1) x ... x 1Explanation of each input
- Number (n) โ the number (n) used in the calculation.
Understanding your result
- n! โ the calculated n!.
Step-by-step calculation
For the example values 5:
- Apply the formula:
n! = n x (n-1) x ... x 1 - Substitute the values: 5x4x3x2x1
- Result: 120
Worked example
| Inputs | 5 |
|---|---|
| Working | 5x4x3x2x1 |
| Result | 120 |
Benefits and practical uses
This calculator saves you time and reduces errors when you need factorial. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- 0 <= n <= 170 (overflow beyond).
Frequently asked questions
What is 0 factorial?
0! is defined as 1.
Disclaimer: Results are provided for general information. Please verify important figures independently.