Permutations with Repetition Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
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Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter n (items to choose from) and r (positions to fill).
- Read the count.
How it works
When order matters and repeats are allowed, the count is n raised to the power r (n^r).
Worked example
n=10, r=3 (a 3-digit PIN). = 1000 possibilities.
Common mistakes
- Using this when items can't repeat — that's standard permutations (nPr).
- Swapping n and r.
Frequently asked questions
When do I use n^r?
When each of the r positions can be any of the n items independently — like PINs, number plates or binary strings.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.