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How to Calculate Factorial

Calculate n! for any non-negative integer.

The Formula

n! = n × (n-1) × ... × 1

The factorial formula uses the mathematical relationship: n! = n × (n-1) × ... × 1. Each variable in the formula represents a measurable quantity that affects the final result.

Step-by-Step Method

  1. 1Identify all input values needed for the factorial calculation.
  2. 2Substitute your known values into the formula: n! = n × (n-1) × ... × 1.
  3. 3Perform the arithmetic operations in the correct order (PEMDAS/BODMAS).
  4. 4Check that your result has the correct units and is within a reasonable range.
  5. 5Verify using the interactive Factorial Calculator to confirm your answer.

Related Topics

factorialcombinatorics

Use the Interactive Calculator

Skip the manual math — get instant results with our free Factorial calculator.

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