Round Robin Betting Calculator
All parlays from 3-8 picks.
How to Use This Calculator
- Set the odds format: Decimal, Fractional, or American
- Input the unit stake (the amount applied to each individual bet)
- Add 3 to 8 selections, each with its odds
- Flag each selection’s outcome: Won, Lost, or Void
- Define the minimum and maximum parlay sizes (e.g., 2-way through 3-way)
- Read off the total return, profit, and 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
Define a round robin bet.
A round robin generates every possible parlay combination from your selections at the fold sizes you specify. From 4 picks, for instance, it produces all 6 of the 2-way parlays and all 4 of the 3-way parlays.
Round robin versus a standard parlay — what differs?
A standard parlay is a single bet stacking all selections together. A round robin distributes your selections across several smaller parlays, allowing some to pay even when others fail.
Which fold sizes are best?
2-way parlays maximize win frequency at the cost of smaller payouts. 3-way parlays sit in the middle. Larger folds yield fewer, higher-risk bets with larger upside.