Factorial Calculator

Instantly calculate the factorial (n!) of an integer.

This tool has an API.Automate it from your code — 1 credit/call.Open in Playground

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Input

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Output

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How to use Factorial CalculatorEvery option explained, a worked example, and what to check when the output looks wrong.Read the guide

Examples & Use Cases

Input Integer (n)

Factorial Output (n!)

{ "input": 5, "factorial": 120, "scientific": "1.2e+2" }

What is a Factorial?

In mathematics, the factorial of a non-negative integer `n`, denoted by `n!`, is the product of all positive integers less than or equal to `n`. For example, `5! = 5 x 4 x 3 x 2 x 1 = 120`. Factorials are used extensively in statistics, combinatorics, and probability calculations.

How to use Factorial Calculator

Paste or type your input into the editor on the left.
Leave the defaults, or tweak them if the tool exposes options.
The result appears on the right as you type.
Copy the output or download it.

This tool runs in your browser. Your input is not uploaded or stored.

Use it from the API

Everything this page does is also available as a REST endpoint, so you can call Factorial Calculator from your own code, a script or a CI pipeline.


Bash
curl "https://api.toolsxpo.com/v1/factorial-calculator" \
  -H "Authorization: Bearer txp_live_YOUR_KEY"

The endpoint returns a JSON envelope ({ ok, data, meta }) and costs 1 credit per successful call. Try it in the playground or browse the full API reference.