How to Calculate Factorials

  1. Open the HeronTool website and locate the “Factorial Calculator” tool.
  2. Enter a non-negative integer (e.g., 5) in the input field, then click the “Calculate” button.
  3. The tool instantly displays the result (5! = 120) along with a step-by-step breakdown for verification.

Permutation Calculation Tips

  1. In the same tool, select the “Permutation” mode.
  2. Enter the total number n and the chosen count r (e.g., n=5, r=3).
  3. Click “Calculate” to get the permutation count P(5,3) = 60. The tool also shows the formula n!/(n-r)!.

Common Use Cases

  • Quickly count total possible outcomes in probability and statistics.
  • Generate all permutations or check algorithm complexity in programming.
  • Support math teaching by verifying manual calculations.

FAQ

Q: Can I calculate factorials of negative numbers? No, factorials are defined only for non-negative integers.
Q: What if the number is very large? The tool supports big-number calculations, but be mindful of browser performance.
Q: What's the difference between permutation and combination? Permutation considers order; combination does not. The tool also offers combination calculation (extra feature).