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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

Odds format (applies to all legs)
Legs (3)

3–8 legs.

Round robin size (parlays of how many?)

Doubles = every 2-leg sub-parlay.

This is per sub-parlay, not total. The calculator multiplies by the number of combinations.

Round robin payouts at a glance

Every pick at −110, $10 per parlay. "If 1 loses" is what you collect when exactly one pick misses: only the parlays that include it lose. "Wins to profit" is the fewest winning picks that return more than you risked.

Round robin Parlays Total risk If all win If 1 loses Wins to profit
3 picks by 2s 3 $30.00 $109.34 $36.45 2 of 3
4 picks by 2s 6 $60.00 $218.68 $109.34 3 of 4
4 picks by 3s 4 $40.00 $278.32 $69.58 3 of 4
5 picks by 2s 10 $100.00 $364.46 $218.68 3 of 5
5 picks by 3s 10 $100.00 $695.79 $278.32 4 of 5
5 picks by 4s 5 $50.00 $664.17 $132.83 4 of 5
6 picks by 2s 15 $150.00 $546.69 $364.46 4 of 6
6 picks by 3s 20 $200.00 $1,391.59 $695.79 4 of 6
6 picks by 4s 15 $150.00 $1,992.50 $664.17 5 of 6
7 picks by 2s 21 $210.00 $765.37 $546.69 4 of 7
7 picks by 3s 35 $350.00 $2,435.27 $1,391.59 5 of 7
8 picks by 2s 28 $280.00 $1,020.50 $765.37 5 of 8
8 picks by 3s 56 $560.00 $3,896.44 $2,435.27 5 of 8

Collect amounts include your stake. Different odds or stakes? Enter them in the calculator above; it uses the same math.

Round robins at FanDuel, DraftKings, and other sportsbooks

Most US sportsbooks, FanDuel and DraftKings included, offer the round robin option in the bet slip once you've added three or more picks.

  • Sizes are labeled by legs per parlay, such as "by 2s" or "2-pick." Each size shows how many parlays it creates. Exact wording varies by book and changes as apps update.
  • The stake you enter is per parlay, not for the whole ticket. $5 on 4 picks by 2s is six parlays, so $30 total. Check the total on the slip before you confirm.
  • The math is the same at every book. Enter the odds your slip shows and this calculator gives the same payouts, before you place anything.

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.