Factorial Calculator (n!)

  • Enter a non-negative integer in the input field.
  • Click "Calculate Factorial" to calculate the factorial.
  • View the result, detailed calculation, and formula.
  • Your calculation history will be displayed below.
  • Click "Clear Results" to reset the results and history.
  • Click "Copy Results" to copy the result and explanation to the clipboard.
Calculation History:

    What is Factorial?

    In mathematics, the factorial of a non-negative integer “n,” denoted as “n!”, is the product of all positive integers from 1 to “n.” It is a fundamental mathematical operation used in various mathematical and combinatorial calculations. The factorial of 0 is defined to be 1 by convention.

    All Formulae Related to Factorial

    1. Factorial Formula:
      • The factorial of a non-negative integer “n” is calculated as follows: n! = n × (n - 1) × (n - 2) × ... × 3 × 2 × 1
    2. Factorial of 0:
      • By convention, the factorial of 0 is defined to be 1:Copy code0! = 1
    3. Factorial of 1:
      • The factorial of 1 is also 1: 1! = 1
    4. Factorial of a Negative Integer:
      • Factorials are not defined for negative integers. The factorial function is only defined for non-negative integers (including zero).
    5. Factorial Recursion:
      • Factorials can be expressed recursively as follows: n! = n × (n - 1)!
    6. Factorial Properties:
      • Factorials have several properties, including:
        • Multiplying a factorial by a positive integer “k” results in a new factorial: (k × n)! = k! × n!
        • Dividing a factorial by a positive integer “k” results in a new factorial: (n / k)! = n! / (n - k)!
        • Factorials grow rapidly with increasing “n.” For large values of “n,” the approximation n! ≈ √(2πn) * (n/e)^n is used.

    Applications of Factorial Calculator in Various Fields

    A Factorial Calculator, which computes the factorial of a non-negative integer, has various applications in different fields of mathematics, science, engineering, and computer science. Here are some of the key applications of a Factorial Calculator in various fields:

    1. Combinatorics:
      • Factorials are fundamental in combinatorial mathematics, where they are used to calculate permutations and combinations. They help determine the number of ways to arrange or choose elements from a set.
    2. Probability and Statistics:
      • In statistics, factorials are used in calculating probabilities, especially in problems involving permutations and combinations. They play a crucial role in probability distributions like the binomial and Poisson distributions.
    3. Mathematical Analysis:
      • Factorials appear in series expansions and power series, such as Taylor series and Maclaurin series, used for mathematical analysis and approximation of functions.
    4. Calculus:
      • Factorials are encountered in calculus, particularly in the derivatives and integrals of functions involving factorials.
    5. Engineering:
      • Engineers use factorials in problems related to reliability analysis, quality control, and system design. They help calculate the probability of success or failure in complex systems.

    Benefits of Using the Factorial Calculator

    Here are the key advantages of using such a calculator:

    1. Accuracy: Factorial calculations can become complex for large values of “n.” A calculator ensures accurate results without the risk of manual calculation errors.
    2. Time-Saving: Factorial calculations can be time-consuming, especially for large numbers. A calculator provides quick results, saving valuable time.
    3. Efficiency: It streamlines the process of calculating factorials, making it more efficient, especially when dealing with multiple calculations.
    4. Reduced Risk of Errors: Manual calculations of factorials can lead to mistakes, but a calculator minimizes the potential for errors, ensuring reliability.
    5. Versatility: Factorial calculators are versatile tools that can handle a wide range of values for “n,” from small integers to very large numbers.


    1. “Beyond Repeated Multiplication: Factorials in Combinatorics and Probability” by Discrete Mathematics
    2. “From Stirling’s Approximation to Asymptotic Analysis: Unveiling the Hidden Depths of Factorials” by Journal of Mathematical Analysis and Applications

    Last Updated : 27 February, 2024

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    9 thoughts on “Factorial Calculator (n!)”

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