Question 1

What is a factorial?

Accepted Answer

n\! = n × (n-1) × ... × 2 × 1. Example: 5\! = 5×4×3×2×1 = 120. Used in permutations and combinations.

Question 2

How do I calculate large factorials?

Accepted Answer

10\! = 3,628,800. 20\! = 2.4 quintillion. Factorials grow extremely fast. Use calculators for n > 10.

Question 3

How accurate are these calculations?

Accepted Answer

Our calculator uses double-precision floating-point arithmetic, accurate to about 15-16 significant digits for most calculations.

Question 4

Can I use the result in further calculations?

Accepted Answer

Yes, results are calculated to full precision. You can copy the exact value or use the rounded display depending on your needs.

Factorial Calculator - Free Online Tool

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