Permutation & Combination Calculator
Compute nPr and nCr — order matters, or it doesn't.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use Permutation & Combination Calculator
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Enter n (total number of items) and r (items chosen).
- 2
Step 2. See nPr (permutations, order matters) and nCr (combinations, order doesn't) update instantly.
- 3
Step 3. The factorial values of n, r and (n−r) are shown for context.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about permutation & combination calculator.
Probability Calculator
P(A), P(A∪B), P(A∩B) — single and joint event probability.
Fibonacci Generator
Generate the first N Fibonacci numbers — arbitrary precision.
Grade Calculator
Weighted class grade from assignments, exams and categories.
Prime Number Generator
List the first N primes — or primes up to a limit.