# Permutation & Combination Calculator

> Calculate nPr, nCr and factorials for counting and probability problems.

To calculate permutations and combinations, enter the total number of items and how many you are choosing. Permutations count ordered arrangements, combinations count unordered selections, and the tool shows both alongside the relevant factorials.

**URL:** https://convertto.tech/t/permutation-combination-calculator
**Category:** Calculators (https://convertto.tech/c/calculators)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Set the total items (n).
2. Set the chosen items (r).
3. Choose the calculate.
4. The result appears immediately — copy or download it.

## FAQ

### When do I use nPr instead of nCr?

Use nPr when order matters — race positions, passwords, seating arrangements. Use nCr when it does not — lottery numbers, committee members, a hand of cards.

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