Round-Robin Parlays Explained
One bet that breaks into multiple smaller parlays automatically. Trade size for hit rate when you want to spread risk across selections.
A round-robin parlay takes a list of selections and automatically builds every possible smaller parlay combination from them. With four selections, a round-robin generates six 2-leg parlays. With five selections, it generates ten 2-leg parlays. The trade-off: more bets cost more money, but you can lose one or two legs and still cash some of the smaller parlays.
How round-robins work
Say you have four NFL selections you like:
- Chiefs −3
- Bills moneyline
- Eagles total Over 48.5
- 49ers −7
A standard 4-leg parlay requires all four to win. Lose any one and the parlay loses.
A round-robin “by 2s” automatically builds all 2-leg parlay combinations:
- Chiefs + Bills
- Chiefs + Eagles
- Chiefs + 49ers
- Bills + Eagles
- Bills + 49ers
- Eagles + 49ers
That’s six 2-leg parlays. Stake $5 on each costs $30 total. If three of your four selections win and one loses, three of the six 2-leg parlays cash. You don’t get the full 4-leg parlay payout, but you don’t lose everything either.
Round-robin sizing
Most sportsbooks let you build round-robins by 2s, 3s, or 4s — combining your selections into 2-leg, 3-leg, or 4-leg parlays.
| Selections | By 2s | By 3s | By 4s | By 5s |
|---|---|---|---|---|
| 3 | 3 parlays | 1 parlay | — | — |
| 4 | 6 parlays | 4 parlays | 1 parlay | — |
| 5 | 10 parlays | 10 parlays | 5 parlays | 1 parlay |
| 6 | 15 parlays | 20 parlays | 15 parlays | 6 parlays |
| 8 | 28 parlays | 56 parlays | 70 parlays | 56 parlays |
Eight selections by 3s = 56 parlays. At $5 each, that’s $280 total stake — round-robins can get expensive fast.
When round-robins make sense
Good use cases:
- You have 4-6 selections you like roughly equally and want to spread risk
- You want some payout even if one leg loses
- You want diversified exposure across a slate of games
- You’re using bonus bets and want to extend their action
Bad use cases:
- You only really like 2-3 of your “selections” — round-robin amplifies weak picks
- You’re trying to chase a big payout (just bet a single parlay)
- Your stake size on each leg is so small the math doesn’t work
- You haven’t calculated total stake before placing
The math: hit rate vs. payout
Round-robins are inherently lower-variance than single parlays:
- 5-leg parlay at -110 each: ~3.5% chance to hit, ~2280% payout
- 5-selection round-robin by 2s (10 × 2-leg parlays): Much higher chance to cash something, much smaller potential maximum payout
You’re trading top-end payout for floor protection. For most casual bettors, that’s a worse expected value because round-robins compound the sportsbook’s parlay margin across multiple bets. For sharp bettors with genuine edges on each selection, round-robins can make sense as risk management.
How to build a round-robin
Most Missouri sportsbooks support round-robins natively:
- Add 4+ selections to your bet slip
- Select “Round Robin” or “Combo” option (varies by app)
- Choose your sizing (by 2s, 3s, etc.)
- Set per-parlay stake — total stake = stake × number of parlays
- Review and place
DraftKings, FanDuel, BetMGM, and Caesars all support round-robins. Use our parlay calculator to see what each individual parlay would pay before you commit.
Three rules for round-robins
- Calculate total stake first. A “$5 round-robin” with 8 selections by 3s is $280 total. Always do the multiplication before placing.
- Use them when you actually like all your picks. Round-robins amplify weak selections. Picking 5 plays just to fill out a round-robin is a fast way to lose.
- Don’t round-robin into pure long shots. A round-robin of +500 selections still has tiny hit rates. The format is better suited to spreading moderate plays, not stacking long shots.