Round Robin Sports Calculator
Make every parlay from 3-8 picks.
How to Use This Calculator
- Pick the odds format you like best (Decimal, Fractional, or American)
- Pop in your unit stake (this is what each individual bet costs)
- Add between 3 and 8 selections along with their odds
- Tap Won, Lost, or Void for each selection
- Choose your smallest and biggest parlay sizes (say, 2-way up to 3-way)
- Check out the total return, profit, and a tidy breakdown by bet type
Formula
Round robin bets are calculated by generating all possible combinations of your selections at each fold size.
Number of combinations = C(n, k) where n = number of selections, k = fold size
For example, 4 selections with 2-way and 3-way parlays:
- C(4,2) = 6 doubles
- C(4,3) = 4 trebles
- Total: 10 bets
Frequently Asked Questions
What exactly is a round robin bet?
A round robin builds every possible parlay combination from your picks at the fold sizes you choose. Say you have 4 selections — you’d get all 6 of the possible 2-way parlays plus all 4 of the possible 3-way parlays.
How does a round robin compare to a normal parlay?
A standard parlay is just one bet rolling all your picks together. A round robin breaks your picks into lots of smaller parlays instead, so a few can still come in even when others don’t.
Which fold sizes are best to pick?
Going with 2-way parlays gives you the best shot at a win but smaller payouts. 3-way parlays sit nicely in the middle. The bigger the fold size, the fewer and riskier the bets, but the payouts get juicier.