What is arbitrage betting (a surebet)?
Arbitrage betting — also called a surebet, sure bet or arb — takes advantage of the differences in odds between bookmakers. When the odds on the same event are high enough, you can bet on every possible outcome and still come out ahead no matter which one happens. The key to surebetting is splitting your stakes correctly — and that is exactly what this sure bet calculator does for you.
New to this? Read our full guide: What is arbitrage betting?
How to use the calculator
Pick the outcomes
Choose how many ways the bet has — from 2 (e.g. Over/Under) up to 15.
Enter the odds
Type the best odds you found for each outcome across your bookmakers.
Set your stake
Enter the total amount you want to put down on the bet.
Get your profit
Instantly see how much to bet on each side and your guaranteed profit.
Prefer to set the stakes yourself? Just edit any value in the Bet column and the calculator recalculates the profits accordingly. There's also an optional note field next to each outcome — jot down the team, market (1X, Over 2.5) or score to keep track or share a screenshot.
How to spot a surebet
Add up the inverse of each odd: V = 1/odd₁ + 1/odd₂ + … + 1/oddₙ. If V is less than 1, a guaranteed profit exists (a surebet). The further below 1 it is, the higher your profit margin (profitability). The tool calculates V and the profitability automatically.
Want the maths? See the arbitrage betting formula with worked examples.
Need a specific number of outcomes?
We have a dedicated calculator preset for the most common bet types: 2-way, 3-way, 4-way, 5-way and 6-way arbitrage.
More free betting tools
Using a betting exchange? The back lay calculator sizes your lay stake and liability so you profit whichever way it goes. Odds moved after you bet? The hedging calculator shows how much to stake on the other side to lock in your profit. Got a bonus to use? The free bet calculator turns a free bet into locked-in profit. Working bookmaker sign-up offers? The matched betting calculator handles qualifying bets and free bets with commission built in. And when your bookmakers show prices in different formats, the odds converter switches between decimal, fractional, American and implied probability in one click. Just want to know what a bet returns? The odds payout calculator shows your payout and profit.
Frequently asked questions
- Is it free?
- Yes, 100% free and no sign-up. It runs entirely in your browser.
- How many outcomes does it support?
- From 2 to 15 ways, for markets such as 1X2, Over/Under, Correct Score and more.
- Is my data saved?
- No. Nothing is sent to a server — all calculations happen locally on your device.