Factorial Calculator
Factorial Calculator
n! = n × (n−1) × ... × 1
What is the Factorial Calculator?
Factorial Calculator calculate factorial of any number up to 170. It is part of Home of Calculators's Math Calculators suite for mathematical calculations, equations, formulas. The calculator is designed for students, engineers, scientists, but anyone can use it. No signup, no ads, no tracking. Just accurate math, computed locally in your browser using a BigNumber-precision math engine.
The factorial of a non-negative integer n is the product of all positive integers less than or equal to n. By convention, 0! = 1. Factorials are used in combinatorics, probability, and series expansions.
nNon-negative integerHow to use the Factorial Calculator
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Start with n
Begin with the number n itself.
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Multiply descending integers
Multiply n by (n−1), then (n−2), and so on down to 1.
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Special case
If n = 0, the result is 1 by definition.
Quick tips
- All calculations run locally in your browser; your data never leaves your device.
- For best results on mobile, rotate to landscape when entering many values.
- Bookmark this page to come back to your calculation anytime.
- Need a different calculator? Try our visual builder to create your own.
Why Home of Calculators
- 100% private (calculations run in your browser)
- 128-bit BigNumber precision (no rounding errors)
- Works on any device: phone, tablet, desktop
- Free forever (no signup, no ads, no upsells)
Frequently asked questions
Is the Factorial accurate?
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Yes. Home of Calculators uses a BigNumber-precision math engine (64-128 decimal digits) to ensure calculations are accurate. We run 96+ automated tests covering unit conversion, financial formulas, health formulas, and more. For critical decisions (financial, medical, legal), we still recommend consulting a qualified professional.
Is the Factorial Calculator free?
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Yes. Every calculator on Home of Calculators is 100% free, with no signup, no ads, and no hidden fees. The entire platform is free forever.
Do you store the values I enter?
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No. All calculations happen in your browser. We never see, store, or transmit your inputs to any server. Your data stays on your device.
Can I use the Factorial on my phone?
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Yes. Home of Calculators is fully responsive and works on any device (phone, tablet, laptop, or desktop). The interface adapts to your screen size.
Can I embed this calculator on my own website?
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Yes. Click the "Share" button to get an iframe embed code. The embedded calculator will look like any other Home of Calculators widget. You can also build a fully customized version using our visual builder.
Can I build my own custom calculator?
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Absolutely. Home of Calculators's visual builder lets you add fields, write formulas, choose a theme, and brand the result with your own logo, all without writing code.