Round Robin Bet Calculator
“Round robin” means two different bets. In the UK it is a fixed 10-bet wager on three selections; in the US it is every parlay of a chosen size from a list of picks. This calculator settles both, line by line, with winners, losers and void legs.
In one line: UK round robin = 3 doubles + 1 treble + 3 up-and-down pairs = 10 bets. US round robin by 2s on four picks = all 6 two-team parlays.
Decimal odds, win only. American prices: −110 is 1.91, +150 is 2.50; the odds converter does the rest. A void leg, a non-runner or a push counts as 1.00.
Result
How a UK Round Robin Is Settled
Three selections, A, B and C, in different events. The doubles and the treble are ordinary accumulators. The other six bets are three single stakes about pairs: on A and B, one bet is a single on A that, if A wins, puts a stake equal to the original on B out of the return; the other runs the same way from B to A. A half that starts with a loser returns nothing, and a half whose second leg loses keeps the first single's return minus the stake passed on.
Worked example: 2.00, 3.00 and 2.50 at £1 a bet
| Result | Doubles + treble | Up-and-down | Return | Profit |
|---|---|---|---|---|
| All three win | £33.50 | £24.00 | £57.50 | +£47.50 |
| A and B win | £6.00 | £11.00 | £17.00 | +£7.00 |
| Only B wins | £0.00 | £4.00 | £4.00 | −£6.00 |
| A void, B and C win | £20.50 | £20.00 | £40.50 | +£30.50 |
With A and B winning: the double pays 2 × 3 = £6; the A/B pair pays (2 − 1 + 3) + (3 − 1 + 2) = £8; the A/C pair pays 2 − 1 = £1, because the £1 passed to C is lost; the B/C pair pays 3 − 1 = £2. Total £17. With a single winner, only its two up-and-down halves pay, 2 × (odds − 1): that covers the £10 outlay only if the winner is priced above 6.00 (5/1).
The US round robin
American sportsbooks use the name for a set of parlays. With n picks and parlays of size k there are C(n, k) bets: 4 picks by 2s is 6 parlays, by 3s is 4; 6 picks by 3s is 20. Four picks at 1.91 (about −110), $10 a parlay:
| Round robin | Outlay | 4 of 4 win | 3 of 4 win |
|---|---|---|---|
| By 2s (6 parlays) | $60 | $218.89 | $109.44 |
| By 3s (4 parlays) | $40 | $278.71 | $69.68 |
The trade-off is the same as with any multiple: smaller parlays survive a loser, larger ones pay more when everything lands. A push counts as 1.00 and shortens the parlays it is in. Same-game legs usually cannot be combined in a round robin; the reason is in our guide to bet builder correlation. For the related UK full-cover bets, see the doubles and trebles calculator and the full cover bets comparison.
Related Calculators
A UK round robin covers three selections. For eight selections, the largest standard full-cover bet is the Goliath: 247 bets made of 28 doubles, 56 trebles, 70 fourfolds, 56 fivefolds, 28 sixfolds, 8 sevenfolds and one eightfold. The Goliath calculatorworks out the return for any number of winners.
If the stake is a bookmaker free bet token, the stake is not returned with the winnings, so the value of the bet changes. The free bet calculatorshows the difference.
Multiple bets are easier to judge over a season than a single slip. The betting ROI calculatorturns your total stakes and returns into a yield you can compare over time.
Frequently Asked Questions
What is a round robin bet?
In the UK a round robin is 10 bets on three selections in different events: three doubles, one treble and three pairs of single stakes about bets (also called up-and-down bets). At £1 a bet it costs £10. In the US a round robin means something else: every parlay of a chosen size from a list of picks, for example all six 2-team parlays from four picks.
How does a single stakes about bet work?
A single stakes about bet on A and B is two bets. The first is a single on A; if A wins, a stake equal to the original is taken from the return and placed on B. The second is the same in reverse, starting with B. With A at 2.00 and B at 3.00 and £1 stakes, both winning returns £4 on each half, £8 in total; if only A wins, the pair returns £1.
How many winners do you need for a round robin to make a profit?
It depends on the prices. With three selections at 2.00, 3.00 and 2.50 and £1 a bet, two winners (the 2.00 and the 3.00) return £17 against the £10 outlay, while one winner returns between £2 and £4. With three shorter prices, say all at 1.50, two winners return £7.25 and lose money. The calculator shows every combination.
What happens to a round robin if one selection is void?
A void leg or non-runner is settled at odds of 1.00. Doubles that include it become singles on the other selection, the treble becomes a double, and in the up-and-down bets the stake simply passes through the void leg to the other selection. With the first selection void and the other two (3.00 and 2.50) winning, £10 returns £40.50.
Is a US round robin the same as a parlay?
It is a set of parlays. A round robin by 2s on four picks is six separate 2-team parlays, each with its own stake, so one losing pick only kills the parlays that contain it. At $10 each on four picks at 1.91 (about -110), all four winning returns $218.89 on $60, and three of four still returns $109.44.
A round robin multiplies the stake: 10 bets in the UK, 20 parlays for 6 picks by 3s in the US. Check the total outlay before you confirm. 18+ (21+ in most US states). If gambling stops being fun, see our responsible gambling resources.