Factorial Calculator
Calculate factorials and permutations/combinations
Calculate factorials and permutations/combinations. Key features include Factorial (n!) calculation and Permutations (nPr). Use it for math and technical calculations. All processing runs locally in your browser. Your files and text are not sent to Tool-web's server.
Encrypted with HTTPSProcessed in your browser
All processing runs locally in your browser. Your files and text are not sent to Tool-web's server.
Actions:
How to Use
- Enter a number for factorial calculation
- Or enter n and r for permutations/combinations
- View the result instantly
- Use for probability calculations
Features
- Factorial (n!) calculation
- Permutations (nPr)
- Combinations (nCr)
- Double factorial support
- Result in scientific notation
Frequently Asked Questions
What is n factorial?
n! is the product of all positive integers from 1 to n. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.
What is the largest factorial it can calculate?
The tool can calculate exact factorials up to about 170!. Beyond that, results are shown in scientific notation.
What is the difference between permutations and combinations?
Permutations count arrangements where order matters. Combinations count selections where order does not matter.
What math and science tools are available?
We offer scientific calculator, matrix calculator, prime checker, Fibonacci generator, statistics calculator, trigonometry calculator, and more.
Are these tools free to use?
Yes. All math and science tools are completely free with no registration or usage restrictions.
Are the calculations accurate?
Yes. We use precise mathematical algorithms and formulas to ensure accurate results for educational and professional use.
Privacy & Security
All processing happens entirely in your browser using client-side JavaScript. Your files and text are not uploaded to Tool-web's server.
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