The Roundabout is one of horse racing’s lesser-known multiples, built entirely from Single Stakes About (SSA) bets running in both directions between every selection. The Roundabout Calculator untangles exactly how much is staked and returned across the whole structure.
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Unlike a Trixie or Yankee, a Roundabout never combines selections into doubles or trebles. Instead, it links selections in pairs: if the first selection in a pair wins, its full winnings become the stake on the second selection in that same pair.
With 3 selections, a Roundabout creates 6 such pairs (each selection paired with each other selection, in both directions); with 4 selections, it creates 12. This calculator builds every leg, applies your results, and totals the outcome.
📊 How to Use the Roundabout Calculator
Choose 3 or 4 selections first, since this determines how many SSA legs make up the full bet — 6 legs for 3 selections, 12 legs for 4.
A Roundabout is not one bet but a bundle of separate Single Stakes About bets, one for every ordered pair of selections in the group.
Enter your odds format, unit stake per leg, and each selection’s odds and result. The calculator automatically works out every leg’s outcome based on which selections won or lost.
🔢 Calculator Fields Explained
Number of Selections – 3 or 4, the two standard Roundabout sizes, determining total leg count.
Odds Format – Decimal or American, converted internally for consistent calculation.
Unit Stake per Leg – the starting stake placed on the first selection in every SSA leg.
Selection Odds – the price for each individual selection in the group.
Won/Lost Toggle – the actual result for each selection, used to determine which legs paid out.
💰 Understanding the Results
| Result | What It Tells You |
|---|---|
| Total Staked | Sum of the unit stake across every leg in the Roundabout |
| Total Returned | Sum of all payouts across every leg that completed successfully |
| Net Profit | Total returned minus total staked across the entire bet |
| Leg-by-Leg Breakdown | Exactly which pairs paid out and which stopped after the first selection lost |
The leg-by-leg table is the most useful part of the results, since it shows precisely why the overall total came out the way it did — which pairs completed, and which never got past the first selection.
A losing first selection in any leg means that entire leg’s second bet is never placed — the stake for that leg is simply gone, with no partial return.
Only legs where the first selection actually won have any chance of returning a profit.
📐 Calculation Formulas
| Component | Formula | Best Used For |
|---|---|---|
| Total Legs (3 selections) | 3 × 2 = 6 ordered pairs | Working out total bet count and stake |
| Total Legs (4 selections) | 4 × 3 = 12 ordered pairs | Working out total bet count and stake for larger Roundabouts |
| SSA Leg Return | (Unit Stake × First Odds) × Second Odds, if both win | Calculating a single leg’s payout |
Each SSA leg is mathematically identical to a simple “up-and-down” bet: the first bet’s full return, stake included, becomes the entire stake of the second bet.
A Roundabout’s total cost scales with the number of ordered pairs, not the number of selections directly — 4 selections nearly doubles the leg count compared to 3.
This is why moving from a 3-selection to a 4-selection Roundabout roughly doubles total stake required, even though only one extra selection was added.
📝 Practical Examples
Example 1: A 3-selection Roundabout at $5 per leg (6 legs, $30 total staked). Selection A wins at 2.5, Selection C wins at 4.0, Selection B loses. Legs starting with B lose immediately; legs starting with A or C that lead into B also stop after the first bet.
Example 2: In the same scenario, the A→C leg completes fully: $5 at 2.5 returns $12.50, which becomes the stake on C at 4.0, returning $50 for that single leg alone.
A single fully-completing leg in a Roundabout can return far more than its own unit stake, since the winnings compound across two prices rather than just one.
Example 3: A 4-selection Roundabout with only one winner among the four selections will see most of its 12 legs fail immediately, since any leg starting with a loser stops instantly and any leg ending with a loser also returns nothing.
Across all three examples, a Roundabout’s overall profitability depends heavily on how many selections win, not just which ones.
💡 Tips & Best Practices
Use 3-selection Roundabouts when testing the concept, since the smaller leg count makes it easier to follow which pairs completed and which didn’t.
Remember that a Roundabout needs multiple selections to win, and specifically needs winners appearing consecutively in a pair, to see meaningful profit.
Compare a Roundabout’s total stake against a simpler multiple like a Yankee or Patent before committing, since the leg count can make total outlay higher than expected.
Use the leg-by-leg breakdown actively, not just the final total, to understand which specific pairings were responsible for any profit or loss.
Running a few different win/loss combinations through the calculator before betting builds intuition for how sensitive Roundabouts are to which selections win.
Consider whether a straightforward accumulator or each-way multiple might suit your selections better, since Roundabouts are a niche, higher-stake structure by design.
⚠️ Common Mistakes to Avoid
Confusing Roundabout With Round Robin
A Round Robin bundles doubles, trebles, and up-and-down bets across selections; a Roundabout is exclusively made of Single Stakes About legs in both directions.
Assuming Roundabout and Round Robin are the same bet is a common and costly mix-up between two very different multiple structures.
Always confirm exactly which bet type is being placed before staking, since the total cost and structure differ significantly between the two.
Underestimating Total Stake for 4-Selection Roundabouts
Moving from 3 to 4 selections doubles the leg count from 6 to 12, which can catch bettors off guard on total outlay.
Always check the total staked figure directly rather than assuming cost scales in simple proportion to the number of selections.
Assuming a Single Winning Selection Guarantees Profit
A winning selection only pays out on legs where it’s paired usefully — either as a starting winner into another winner, or in a leg that reaches it after a prior win.
One winning selection among several losers is rarely enough to produce an overall profit across a full Roundabout.
Always check total returned against total staked across every leg, not just whether any individual selection won. Assuming isolated wins guarantee overall profit is the costliest misunderstanding of Roundabout bets.
🎯 When to Use This Calculator
Use this tool before placing a Roundabout to understand exactly how many legs are involved, what each one costs, and how sensitive the overall result is to which selections actually win.
A Roundabout rewards clusters of consecutive winners far more than isolated ones — this calculator makes that structural reality visible before you stake anything.
It’s also useful after the fact, for reconciling a settled Roundabout bet against what the bookmaker actually paid out, leg by leg.
🔗 Related Calculators
Patent Calculator, Trixie Calculator, Yankee Calculator, Round Robin Calculator, Parlay Calculator, Each Way Calculator
📖 Glossary
Roundabout – a multiple bet made entirely of Single Stakes About legs between every pair of selections, in both directions.
Single Stakes About (SSA) – a two-selection bet where winnings from the first selection become the stake on the second.
Up-and-Down – another common name for a Single Stakes About bet.
Leg – one individual SSA bet within the larger Roundabout structure.
Ordered Pair – a directional pairing of two selections, where order determines which one’s winnings feed the other.
Round Robin – a different multiple bet combining doubles, trebles, and up-and-down bets, often confused with Roundabout.
Total Staked – the sum of unit stakes committed across every leg of the Roundabout.
Total Returned – the sum of all payouts from legs that completed successfully.
Decimal Odds – odds format where the payout multiple includes the original stake.
Unit Stake – the fixed starting amount placed on the first selection of every leg.
❓ Frequently Asked Questions
How many bets are in a 3-selection Roundabout?
A 3-selection Roundabout contains 6 individual SSA legs, since every one of the 3 selections is paired with each of the other 2, in both directions.
This means the total stake is 6 times your chosen unit stake, even though only 3 selections are involved.
What happens if the first selection in a leg loses?
That leg simply stops — the second bet in that pair is never placed, and the leg’s stake is lost in full, with no partial return.
This is identical to how a standard Single Stakes About or up-and-down bet behaves when the first leg loses.
Is a Roundabout the same as betting every selection individually?
No — a Roundabout links selections together through winnings reinvestment, meaning a win on one selection can substantially increase the stake (and payout) on another.
Betting selections individually as separate singles would not produce this compounding effect between winners.
Can a Roundabout be built with more than 4 selections?
Technically yes, though leg counts grow quickly — 5 selections would produce 20 legs, making the bet expensive and complex to track. Most bookmakers and bettors stick to 3 or 4.
Leg count grows by n × (n-1), so each additional selection adds substantially more legs than the last.
Does a Roundabout pay out if only one selection wins?
Only partially at best — a single winning selection can only complete a leg if it’s paired usefully with another result, and most legs involving only one overall winner will still fail.
Meaningful profit generally requires at least two selections to win, ideally ones that are paired together in the same leg.
⚖️ Legal Disclaimer
This calculator is provided for educational and informational purposes only. It calculates theoretical stakes and returns for Single Stakes About-style multiple bets based on the odds and results entered, and does not guarantee any betting outcome. Please gamble responsibly and within your means.
