# Factorial Calculator

Here is the answer to questions like: What is the factorial of 1? What is the last digits of factorial of 1? How many trailing zeros in 1 factorial? How many digits are there in 1 factorial? Use the factorial calculator below to find the factorial of any real number between 0 and 10.000.

## What is factorial?## Definition of factorialThe factorial is a quantity defined any all integer x greater than or equal to 0. The factorial is the product of all integers less than or equal to x but greater than or equal to 1. The factorial value of 0 is by definition equal to 1. For negative integers, factorials are not defined. The factorial can be seen as the result of multiplying a sequence of descending natural numbers (such as 3 × 2 × 1). The factorial symbol is the exclamation mark !. ## The factorial formulaIf n is an natural number greater than or equal to 1, then n! = n x (n - 1) x (n - 2) x (n - 3) ... 3 x 2 x 1 If p = 0, then p! = 1 by convention. Example: 6! = 6 x 5 x 4 x 3 x 2 x 1 = 720 |
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## Table of Factorials until 30
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## Sample Factorials Calculations. |