Round Robin Calculator
Generate every parlay from 3-8 selections, all 2-way and larger combinations.
How to Use This Calculator
- Set the odds notation you want to work in (Decimal, Fractional, or American)
- Input the unit stake applied to each individual bet
- Register your selections (3 to 8) along with their odds
- Flag the outcome of each selection (Won, Lost, or Void)
- Define the minimum and maximum parlay fold sizes (e.g., 2-way through 3-way)
- Read off the 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
How is a round robin structured?
A round robin generates every possible parlay combination from your selections at the fold sizes you specify. As an example, 4 picks produce all 6 distinct 2-way parlays and all 4 distinct 3-way parlays.
What separates a round robin from a standard parlay?
A standard parlay is a single ticket that bundles all selections together. A round robin distributes those selections across several smaller parlays, which means some can still pay out even when others fail.
Which fold sizes are optimal to select?
2-way parlays maximize your hit rate but return less per win. 3-way parlays sit in the middle as a balanced option. Larger fold sizes produce fewer, higher-variance bets with larger potential payouts.