Round Robin Parlay Calculator
Split your legs into every smaller parlay combination. See total stake, max payout, and what you'd collect if everything hits.
Build your round robin
3–8 legs.
Doubles = every 2-leg sub-parlay.
This is per sub-parlay, not total. The calculator multiplies by the number of combinations.
Sub-parlay breakdown
Each row is a separate bet. All must hit independently for that row to pay.
| Legs | Combined | Payout if hits |
|---|
Show the math
Understand the round robin
How a round robin actually works
A round robin takes your N selections and breaks them into every possible smaller-sized parlay. A 4-leg round robin "by 2s" creates 6 separate two-leg parlays — every pair drawn from your 4 selections. You bet the same stake on each pair. Total stake is the number of pairs (6) times the per-bet stake.
If all 4 legs win, all 6 pairs win. If 3 of 4 win, only the 3 pairs that don't include the loser pay. If 2 of 4 win, only the 1 pair containing those 2 winners pays. Below that, you lose everything.
You can also do "by 3s," "by 4s," etc. The math is the same — C(N, K) combinations.
Round robin vs. straight parlay
A straight 4-leg parlay pays much more if all four legs hit — but pays zero if even one misses. A 4-leg round robin by 2s pays less in the all-win scenario, but if exactly 3 of 4 hit, you still cash the 3 doubles that don't include the loser.
So: round robin = lower ceiling, higher floor. Straight parlay = higher ceiling, zero floor.
Sharps generally prefer straight parlays when conviction on all legs is strong, and round robins when they want exposure with some downside protection. Both compound the sportsbook's vig per leg — that's the underlying cost either way.
Why total stake gets out of hand fast
The combinations grow combinatorially. A 5-leg round robin by 3s is C(5,3) = 10 bets. A 6-leg by 3s is C(6,3) = 20 bets. An 8-leg by 4s is C(8,4) = 70 bets — at $10 per bet that's $700 total exposure to get the round robin coverage.
Always check the "Total stake" number before placing the bet at your sportsbook. The displayed slip usually shows total exposure correctly, but it's easy to mis-set the per-bet stake and end up risking far more than intended.