Introduction
A surebet happens when the odds from different bookmakers let you bet on every outcome of a game and still make a profit no matter who wins. This is also called arbitrage betting. It works because not all bookmakers agree on the same odds, and sometimes the gap between them is big enough to guarantee you money.
This free surebet calculator works out the stakes and profit for you. Enter the odds for each outcome, and it will tell you if a surebet exists. If one does, it shows you exactly how much to stake on each side to lock in a guaranteed profit. The tool supports 2-way markets like tennis or over/under bets, and 3-way markets like football match results that include a draw. You can use decimal, fractional, American, Hong Kong, or Indonesian odds formats. It also handles exchange commissions so your results stay accurate.
The calculator breaks down every step of the math so you can see how it works. It shows your implied probability total, profit margin, return on investment, and the exact stake to place on each outcome. Use it to spot real arbitrage opportunities and size your bets with confidence.
How to Use Our Surebet Calculator
Enter your odds from different bookmakers for the same event. The calculator will tell you if a surebet exists, how much to stake on each outcome, and your guaranteed profit.
Market Type: Pick 2-Way for events with two outcomes, like tennis or over/under bets. Pick 3-Way for events that include a draw, like football match results.
Odds Format: Choose the format your bookmaker uses. Options include Decimal, Fractional, American, Hong Kong, and Indonesian. The calculator converts all formats automatically.
Currency: Select your preferred currency. This changes the symbol shown next to all money values in the results.
Total Stake: Enter the total amount of money you want to bet across all outcomes. Select "Fix total stake" to let the calculator split this amount for you.
Bookmaker: Type the name of the bookmaker offering the odds for each outcome. This field is optional.
Odds: Enter the odds each bookmaker gives for that outcome. Use the format you selected above.
Commission Type: Choose Win if your bookmaker charges commission only on winnings. Choose Bet if commission applies to the full bet amount.
Commission %: Enter the commission percentage your bookmaker charges. Leave it at 0 if there is no commission.
Include This Leg: Uncheck this box to remove an outcome from the calculation without deleting its data.
Fix This Stake: Select this option on any outcome to lock that stake amount. The calculator will then adjust all other stakes and the total stake around it.
Round to Nearest: Choose how to round each stake. This helps when a bookmaker does not accept bets with small decimal amounts.
Press Calculate to see your results. Press Reset Calculator to return all fields to their default values.
What Is a Surebet?
A surebet happens when two or more bookmakers offer odds on the same event that, when combined, guarantee you a profit no matter who wins. This is also called arbitrage betting. The key idea is simple: the odds from different bookmakers disagree enough that you can bet on every possible outcome and still come out ahead.
How Does a Surebet Work?
Every set of odds has a built-in implied probability. This is how likely the bookmaker thinks an outcome is. In a normal market, the implied probabilities for all outcomes add up to more than 100%. The extra amount is the bookmaker's edge. But sometimes, if you pick the best odds from different bookmakers, those probabilities add up to less than 100%. When that happens, you have found a surebet. The gap below 100% is your guaranteed profit margin. To understand how bookmakers build that edge into their odds, our no vig calculator strips the margin away and shows the true implied probabilities.
How to Use This Surebet Calculator
This calculator works out every figure for you. Enter the odds for each outcome, choose your total stake, and it tells you exactly how much to bet on each side. It also shows whether a surebet exists, what your guaranteed profit will be, and your return on investment (ROI). You can switch between 2-way markets like tennis or over/under totals and 3-way markets like football match results that include a draw.
Understanding Effective Odds and Commission
Some betting exchanges charge a commission on your winnings or your total bet. This lowers your real payout. The calculator adjusts for this by computing effective odds, which are your true odds after the commission is taken out. Always enter any commission your platform charges so the results stay accurate.
Why Surebets Are Rare
Bookmakers watch their odds closely and adjust them fast. Surebet chances usually last only minutes. Odds also shift as people place bets. Because of this, speed matters. You need to spot the opportunity, calculate your stakes, and place all bets before the odds change. This calculator helps you act quickly by giving you instant results as you type.
Important Things to Keep in Mind
Surebet profits are usually small, often between 1% and 5% of your total stake. Bookmakers may also limit or close accounts that consistently place arbitrage bets. Always read the terms and conditions of any bookmaker you use. This calculator is a math tool. It shows you the numbers but does not guarantee that odds will stay the same long enough for you to place every bet.