Round Robin Calculator
Build round robin bets from your selections, see every sub-parlay combination, and compare total return against a single full parlay to understand the risk trade-off.
Presets:
Selections
$
Your Selections3 Picks
1
Dec: 1.667
2
Dec: 1.909
3
Dec: 2.300
Results
Round Robin Summary
3 × 2-leg parlays from 3 selections
Total Parlays3
Winning Parlays1
Total Wagered$30.00
Total Returned$31.82
Net P&L+$1.82
ROI+6.1%
Hit Probability & EV Analysis
Full Parlay Prob11.88%
Any Sub-Parlay Prob49.39%
Straight Bets EV-$1.36
Round Robin EV-$2.67
Straight ROI-4.55%
RR ROI-8.88%
Insurance Analysis INSURED — profit if 1 leg loses
| If This Leg Loses | RR Payout | Net Profit |
|---|---|---|
| Chiefs ML | $43.91 | +$13.91 |
| Bills -3 | $38.33 | +$8.33 |
| Eagles ML | $31.82 | +$1.82 |
This round robin is fully insured: you still profit even if any single leg loses. Worst case: $1.82. Best case: $13.91.
Full Parlay vs Round Robin
Full Parlay+632 Payout: $73.18LOSES
VS
Round Robin3 sub-parlays Returned: $31.82PROFIT: +$1.82
Round robin costs $20.00 more in total stake but protects you when 1 leg miss.
Sub-Parlay Breakdown
| # | Legs | Combined Odds | Payout | Status |
|---|---|---|---|---|
| 1 | Chiefs MLBills -3 | +218 | $31.82 | Won |
| 2 | Chiefs MLEagles ML | -150 | $0.00 | Lost |
| 3 | Bills -3Eagles ML | -110 | $0.00 | Lost |
Round Robin Betting Strategy
What is a Round Robin?
A round robin is a series of smaller parlays generated from a larger set of selections. Instead of putting all your picks into one do-or-die parlay, the round robin creates every possible sub-parlay of a chosen size. For example, 4 selections taken in 2-way parlays produces C(4,2) = 6 separate bets. If any one selection loses, some of your sub-parlays can still win, giving you partial protection against a single bad leg.
Round Robin vs Full Parlay
A full parlay pays more when every leg hits, but returns zero if a single selection loses. A round robin trades maximum upside for downside protection. You wager more total (one stake per sub-parlay), but you can still profit even when one or more legs miss. The break-even point depends on the number of losing legs and the odds involved. Generally, round robins shine when you have strong confidence in most picks but want insurance against one surprise loss.
Optimal Selection Count
The sweet spot is 3 to 5 selections with 2-way or 3-way sub-parlays. Fewer than 3 selections and you cannot form a round robin. Beyond 6, the number of sub-parlays grows quickly (C(8,2) = 28 bets), making the total wager expensive relative to the individual payouts. With 4 picks in 2-way parlays you get 6 bets — manageable stake, solid protection, and enough upside if most legs hit. Larger pools are only worthwhile at plus-money odds where each sub-parlay payout is substantial.
When to Use Round Robins
Use round robins when you have 3+ legs you feel confident about but want to hedge against one bad beat destroying your ticket. They are especially valuable for NFL Sundays when you have a full slate of strong leans, futures parlays where one result might not go your way, or any time the full-parlay odds imply less than 5% win probability. Round robins are not ideal for heavy favorites at minus-money odds, where the sub-parlay payouts may not cover the total stake cost even with most legs winning. Always run the numbers here first.
Formulas
Sub-Parlays = C(n, k) = n! / (k! × (n - k)!)Decimal_Odds(leg) = odds > 0 ? (odds/100) + 1 : (100/|odds|) + 1Combo_Decimal = Decimal_A × Decimal_B × ... × Decimal_KCombo_Payout = Stake × Combo_Decimal (if all legs in combo win)Total_Returned = Sum of all winning combo payoutsNet_P&L = Total_Returned - (Sub-Parlays × Stake)ROI = (Net_P&L / Total_Wagered) × 100%Take Your Edge Further
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