Combinations with Repetition Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserIntermediate
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter n (types to choose from) and r (items to choose).
- Read the count.
How it works
When order doesn't matter but repeats are allowed, the count is C(n + r − 1, r).
Worked example
n=5 flavours, r=3 scoops. = 35 combinations.
Common mistakes
- Using this when order matters — that's permutations.
- Forgetting repeats are allowed (otherwise use standard nCr).
Frequently asked questions
What's a real example?
Choosing 3 ice-cream scoops from 5 flavours where you can repeat a flavour — 35 ways.
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.