Factorial Calculator
Calculate the factorial of any non-negative integer.
- Free Online Tool
- Instant Results
- Mobile Friendly
- No Installation
- Secure & Private
Result
Understanding This Calculator
Factorial Formula
Product of all positive integers less than or equal to n.
n! = n × (n-1) × ... × 2 × 1
- 0! = 1 (by definition)
- Max input typically 170 (for 64-bit float limit)
Example 1
5!
- 5 × 4 × 3 × 2 × 1 = 120
How to Use
- Enter a non-negative integer (max 170).
Frequently Asked Questions
How do I use the Factorial Calculator?
Enter your values in the input fields, and the result will appear instantly.
Is this calculator free to use?
Yes, this calculator is 100% free and does not require any registration or subscription.
Is it mobile-friendly?
Absolutely! Our tool is optimized for all devices, including mobile phones, tablets, and desktop computers.