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Free Betting Arbitrage Calculator to find 2-way, 3-way & 4-way sure bets. Calculate stakes, payouts & guaranteed profits instantly online.
Arbitrage betting is one of the most talked-about strategies in sports betting. It’s a way to make a guaranteed profit by placing bets on all possible outcomes of an event using different bookmakers. Our Betting Arbitrage Calculator makes this process simple, accurate, and beginner-friendly. Whether you’re dealing with 2-way, 3-way, or even 4-way markets, our tool calculates the exact stake for each outcome so you can lock in your profits without doing the math yourself.
Arbitrage betting, often called “sure betting” or “arbing,” is when you cover all possible results of a sports event at odds that guarantee a profit. This happens when the total implied probability of all outcomes is less than 100%. The difference between the real odds and the bookmaker’s prices is where your profit comes from. With the right odds and correct stake distribution, you win no matter what the final result is.
The core of the calculator is based on a simple but powerful formula. First, we convert all odds into decimal format to make calculations consistent. Then, we find the implied probability for each outcome:
Implied Probability = 1 ÷ Decimal Odds
We add up all the implied probabilities to get a value called S:
S = (1 ÷ Odds₁) + (1 ÷ Odds₂) + ... + (1 ÷ Oddsₙ)
If S is less than 1, there’s an arbitrage opportunity.
The calculator then works out exactly how much to bet on each outcome:
Stake for Outcome i = Total Stake × [(1 ÷ Oddsᵢ) ÷ S]
This ensures that no matter which outcome wins, your payout is the same.
Guaranteed Payout = Total Stake ÷ S
Net Profit = Guaranteed Payout – Total Stake
Profit % = (1 ÷ S – 1) × 100
Start by entering the number of outcomes for your bet – this could be 2 for a tennis match, 3 for a football match with a draw option, or 4 for more complex markets. For each outcome, enter the odds and choose the correct odds format (decimal, fractional, or American). You can also enter the bookmaker’s name for your reference.
Set your total stake amount. The calculator will instantly display the correct stake for each outcome, your guaranteed payout, and your profit percentage. If the calculator shows S < 1, you have a sure bet opportunity.
Arbitrage betting is legal in most countries, but bookmakers don’t always like it. In some places like the US, sports betting itself is regulated state by state, so you should check local laws. While placing sure bets isn’t technically illegal, some betting sites may limit or close accounts if they detect frequent arbitrage activity.
Yes, arbitrage betting works as long as you place all bets at the right odds and at the same time. The challenge is finding these opportunities before the odds change. That’s why many bettors use an arbitrage betting finder or software to scan for profitable matches. Our calculator then takes those odds and gives you the exact staking plan to make the profit real.
The Betting Arbitrage Calculator is a must-have tool for anyone looking to turn sports betting into a calculated investment. By using accurate formulas, it removes the risk of manual calculation errors and ensures you get the maximum possible return. Whether you’re a casual bettor trying a 2-way market or a seasoned pro calculating 4-way bets, our tool is fast, reliable, and completely free to use.
The formula is: S = sum of (1 ÷ Odds for each outcome). If S < 1, there’s an arbitrage opportunity.
Yes, the calculator works for 2-way, 3-way, and even 4-way markets.
Profit depends on the odds difference between bookmakers and your total stake. The calculator shows exact figures.
Sports betting is regulated state by state. Arbitrage betting itself isn’t illegal, but check your local laws.
You can use a free arbitrage bet finder, paid software, or manually compare odds across multiple bookmakers.