How to use this calculator
Enter American odds for each selection (minimum 3). Choose how many legs per parlay (2, 3, or 4). The calculator generates every combination and shows the payout if that specific combo hits. Total cost is stake x number of combinations.
Formula
Combinations = C(n, k) = n! / (k! x (n-k)!)
where n = total legs, k = parlay size
Total cost = combinations x stake per parlay
Each combo payout = stake x (D1 x D2 x ... - 1)
Example
4 teams in a 2-team round robin = C(4,2) = 6 separate 2-leg parlays. At $10 per parlay, total cost = $60. If legs 1 and 3 each go at -110, that combo pays $10 x (1.909 x 1.909 - 1) = $26.44 profit. The other 5 combos win or lose independently.
Frequently asked questions
What is a round robin bet?
A round robin automatically generates every possible smaller parlay from a group of selections. With 4 teams in a 2-team round robin, you get 6 separate 2-leg parlays. You win any combo where both of those legs win, even if other legs lose.
How many combinations in a 4-team 2-way round robin?
Use the formula C(n, k). For 4 teams and 2-team parlays: C(4,2) = 4! / (2! x 2!) = 6 combinations. For 5 teams in 2-team parlays: C(5,2) = 10 combinations. This calculator computes it automatically.
Is round robin better than a single parlay?
Round robins cost more upfront (stake multiplied by the number of combos) but protect you from a single bad leg busting your whole ticket. If 3 of 4 legs win, you cash multiple combos instead of losing everything. The tradeoff is a lower maximum payout versus one all-or-nothing parlay.
How do I calculate round robin payouts?
For each combo, multiply the decimal odds of the legs in that combo together. Then multiply by your stake per parlay to get total return. Subtract the stake for net profit. Each combination is an independent parlay.
