Surebet Calculator

Find a surebet across a three-way football market and split your stake for a guaranteed profit, using decimal odds.

A surebet calculator spots guaranteed-profit opportunities across a three-way football market and shows exactly how much to stake on each outcome at different bookmakers.

What Is a Surebet?

A surebet — also called an arbitrage or arb — is a set of bets placed at different bookmakers that covers every possible outcome of a market, priced in such a way that you profit no matter what happens. The idea is elegantly simple: instead of backing just one outcome and hoping it lands, you back all three outcomes (Home, Draw, Away on a 1X2 market) at the highest odds available across the betting world, and the gap between what you stake and what you get back is guaranteed profit.

Surebets exist because different bookmakers price the same market differently. If you search across enough books, you will occasionally find a combination where the total implied probability of all outcomes falls below 100%, which means the bookmaker margin has shrunk enough to leave room for profit. That is the telltale sign of a surebet: the math is in your favour before you even place the bet. This is not a high-risk strategy or a statistical edge — it is a mathematical certainty.

The term “surebet” is most common on odds-comparison and syndicator sites, where the concept is used alongside automated arb alerts. Seasoned bettors and syndicates hunt surebets as a form of professional betting, exploiting price differences across the market to lock in small, certain profits.

How Surebet Odds Are Calculated

A surebet is identified by converting each decimal price into an implied probability, adding those probabilities, and checking whether the total is below 100%. The formula is simple: for each outcome, divide 1 by the odds, then add them all together and multiply by 100. If Home is 2.60, Draw 3.60 and Away 3.30, the calculation is (1/2.60 + 1/3.60 + 1/3.30) × 100 = 96.6%. Since 96.6% is below 100%, a surebet exists.

To find the guaranteed profit as a percentage of your stake, divide 100 by the total implied percentage and subtract 100: (100 / 96.6) − 100 = 3.58%. That means every euro you stake returns a guaranteed 3.58 cents of profit, regardless of which outcome happens.

To split your stake correctly across the three outcomes, each bet must be sized proportionally so that all three return the same amount. This is where the calculator does the heavy lifting: it divides your total stake by the total implied percentage in fractional form for each outcome, ensuring that if Home wins (at 2.60), Draw wins (at 3.60), or Away wins (at 3.30), you receive the same payout and pocket the same profit. The maths keeps the risk and reward perfectly balanced.

What the Calculator Shows You

Enter a total stake and the three decimal prices from your chosen bookmakers, and the calculator returns the guaranteed profit and the stake to place on each outcome. Total implied probability is the sum of the three individual probabilities; if it is below 100%, you have a surebet. Guaranteed profit is the amount you will make no matter what the result is — calculated as the payout minus your total stake. The calculator also breaks down each stake (how much you place on Home, Draw and Away) and each return (what you get back if that outcome wins). These figures let you verify that the bookmakers will accept your stakes before you commit.

Worked Example

Suppose you find a three-way 1X2 market where Home is 2.60 at one bookmaker, Draw is 3.60 at another, and Away is 3.30 at a third, and you have EUR 300 to stake.

First, check the total implied probability: (1/2.60 + 1/3.60 + 1/3.30) × 100 = 96.6%. Since this is below 100%, a surebet exists.

Next, the calculator splits your EUR 300 stake across the three outcomes. For a Home win at 2.60, you place EUR 119.52. For a Draw at 3.60, you place EUR 86.32. For an Away win at 3.30, you place EUR 94.16. Note that the stakes are unequal because the odds are unequal; the shorter prices get more of the stake.

Now the payouts: if Home wins, your EUR 119.52 at 2.60 returns EUR 310.74. If the Draw comes in, your EUR 86.32 at 3.60 returns EUR 310.74. If Away wins, your EUR 94.16 at 3.30 returns EUR 310.74. All three paths return the same amount. Subtract your total stake of EUR 300, and the guaranteed profit is EUR 10.74 — a 3.58% return.

Guaranteed Profit by Total Stake

At this 3.58% surebet margin, the guaranteed profit scales linearly with the stake.

Implied Probability of Each 1X2 Outcome

In any three-way market, the decimal price determines the implied probability. For a surebet to exist, the combined implied probabilities of all three outcomes must fall below 100% — meaning the bookmakers have collectively under-priced the market relative to their own combined risk. The table below shows how each Home, Draw and Away price translates into its implied probability. The key insight is that these three probabilities must sum to less than 100% for arbitrage to be possible.

At 96.6% total, the three outcomes fall short of 100% — this gap is the bookmaker margin that creates the surebet opportunity. This gap is what you profit from by splitting your stake proportionally across the three outcomes. Without this gap (without a total below 100%), the market is fair and no surebet exists. Professional arb hunters scan markets constantly, looking for exactly this: three prices so low that their combined probability falls short of 100%.

Practical Execution and the Race Against Time

The biggest practical risk with a three-way surebet is time. Because you are matching three different bookmakers, the odds may move between the moment you identify the surebet and the moment you finish placing all three bets. If any price shortens while you are still looking, the total implied probability rises and may climb above 100%, eliminating the surebet. This is why syndicates stake the shortest price first and confirm each bet in writing before moving to the next. Speed is essential; even a five-minute delay can mean the difference between locking profit and chasing a mirage.

Bookmakers also impose maximum stake limits on individual markets, and limits often vary between sports and bet types. A surebet that works on paper may collapse in practice if your preferred size exceeds a bookmaker’s limit. Likewise, some bookmakers restrict arb play by closing accounts or refusing bets on identified arb combinations. Before committing significant capital, it is worth confirming that all three bookmakers will accept your proposed stakes at the prices shown. This due diligence separates professional arb players from amateur wishful thinkers.

Finally, any total implied probability above 100% means there is no surebet. Rounding errors and the practical difficulty of matching prices at the exact moment they are quoted mean that thin margins often evaporate before you get the money down. A three-way surebet needs all three legs locked at the quoted prices; even small movement in one price can destroy the edge.

When a Surebet Makes Sense

Surebets are not a strategy for most recreational bettors; they are a tool for syndicates and professional punters looking for small, certain edges. The appeal is clear: there is no luck involved, no analysis required, and no outcome that costs you money. The downside is equally clear: the margins are usually tiny — often between 1% and 5% — and only viable at scale. A EUR 10.74 profit on a EUR 300 stake is attractive only if you can execute dozens or hundreds of these bets per month with minimal slippage. Single surebets scattered across the year barely cover transaction costs.

Surebets also require access to a wide range of bookmakers with high limits and tolerance for arb play. Most mainstream online shops discourage or block this activity outright, so surebet players typically must navigate a mix of smaller regional books, betting exchanges and specialist arb services. The regulatory and logistical overhead — managing multiple accounts, confirming stakes with customer services, and recovering accounts that have been closed — means that surebet play is usually viable only as a professional pursuit, not a hobby. The infrastructure investment in these accounts and the ongoing relationship management with multiple bookmakers makes arb betting a serious operational commitment, not a casual side bet.

Common Mistakes

The most common pitfall is rounding the stakes so heavily that the three returns no longer match, turning the surebet into a lopsided bet. Never round stakes to whole euros; the calculator gives you precise figures for a reason. Another frequent error is assuming the surebet survives after just one price moves. Even a small change — a point or two on one of the three odds — can push the total implied probability over 100% and eliminate the edge. Equally, ignoring bookmaker betting limits and maximum stakes is dangerous; a book may reject your largest bet and leave you exposed on one outcome. Finally, some bettors confuse a bookmaker margin that is just over 100% with a surebet. Any total implied probability above 100% is a house edge, and rounding or slippage will turn it into a loss.

Surebet vs a Normal Market

The key difference between a surebet and a conventional 1X2 market is where the edge lies.