The Permutation and Combination Calculator is a powerful and easy-to-use mathematical tool designed to help students, teachers, and professionals calculate nPr (permutations) and nCr (combinations) accurately and quickly.

This calculator allows you to enter the total number of elements (n) and the number of elements selected (r) and instantly displays both the formula and the final computed result in a clean, structured format. It clearly distinguishes between permutations (where order matters) and combinations (where order does not matter), making it ideal for learning and revision.

The tool follows standard mathematical definitions:

Permutation (nPr) is used when the order of selection is important.
Combination (nCr) is used when the order of selection is not important.

With a professional split-view layout, colorful icons, dark bordered result cards, and hover-only effects, the calculator provides a distraction-free and academic user experience. It also handles invalid cases gracefully, such as when the value of r is greater than n, by showing a clear explanatory message instead of failing silently.

This calculator is especially useful for:

School and college mathematics
Probability and statistics
Competitive exam preparation
Computer science and data science basics
Quick verification of manual calculations

Whether you are learning permutations and combinations for the first time or need a fast and reliable calculator, this tool delivers accuracy, clarity, and excellent usability.