Factorial Calculator
FreeCalculate factorial of any number (n!)
Limited to 170! (beyond that exceeds JS number range).
About Factorial Calculator
Factorials grow at a staggering pace: multiply every whole number up to your target and the result balloons within just a few steps. Working out n! by hand past a small number is tedious and error-prone, yet it shows up constantly in probability, combinatorics, and math homework. This calculator handles the whole multiplication chain for you.
Enter a number and the tool returns its factorial, the product of every positive integer up to it. It's free, runs in your browser, and needs no signup. Instead of stacking multiplications and second-guessing your arithmetic, you get the exact value instantly, ready to use in a formula or to check your own working.
Common uses
- Solving probability and combinatorics problems that use n!
- Checking a factorial you worked out by hand
- Computing permutations and combinations that need factorials
- Exploring how fast factorial values grow
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- 100% Free — no account needed
- Works in your browser — no software required
- Instant results
- Secure and private
- No data stored
- Simple to use
FAQ
What is the factorial of zero?
Zero factorial equals one by definition, and the calculator returns this just as mathematics expects.
Why do large factorials get so big so fast?
Because you multiply by every integer up the chain, the result grows extremely quickly, far faster than exponential growth.
Can it handle decimals or negative numbers?
Factorials are defined for whole non-negative numbers, so the tool works with those rather than fractions or negatives.
Can I use Factorial Calculator on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.