Round Robin Tool
Build every parlay from 3-8 picks and see all 2-way and larger combinations.
How to Use This Calculator
- Pick the odds format (Decimal, Fractional, or American)
- Set the unit stake (the amount staked on each individual bet)
- Add your selections (3 to 8) along with their odds
- Mark each selection Won, Lost, or Void
- Set the minimum and maximum parlay sizes (e.g. 2-way to 3-way)
- Read off total return, profit, and the per-bet-type breakdown
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 is a round robin bet?
A round robin builds every possible parlay combination from your picks at the fold sizes you choose. From 4 picks, for instance, you get all 6 possible 2-way parlays and all 4 possible 3-way parlays.
How does a round robin differ from a standard parlay?
A standard parlay is a single bet tying all selections together. A round robin breaks your picks into several smaller parlays, so some can still pay even when others lose.
Which fold sizes should I pick?
2-way parlays win most often but pay less. 3-way parlays sit in the middle. Larger folds mean fewer, riskier bets with larger potential payouts.