Learn Arbitrage

What is Arbitrage Betting?

Arbitrage betting — often called "arbing" — is a strategy that takes advantage of different bookmakers offering different odds on the same sporting event. When the odds differ enough, you can place bets on all possible outcomes and target a profit regardless of the result.

This works because bookmakers set their odds independently. They don't always agree on the probability of an outcome, and when their disagreements are large enough, a gap opens up that you can exploit.

It uses a mathematical approach to wagering rather than predicting outcomes. You're not picking winners or relying on luck — you're taking advantage of a pricing inefficiency between bookmakers, similar to how currency arbitrage works in financial markets. That said, it still involves placing bets with licensed bookmakers.

How Does It Work?

Every bookmaker builds a margin (also called "overround" or "vig") into their odds. This is how they make money. Normally, if you add up the implied probabilities of all outcomes from a single bookmaker, they'll total more than 100% — that extra percentage is their margin.

An arbitrage opportunity appears when you combine the best odds from different bookmakers and the total implied probability drops below 100%. The difference between 100% and that total is your profit margin.

The Formula

For a two-outcome event (like a tennis match or head-to-head market):

Implied probability = (1 / odds1) + (1 / odds2)

If this total is less than 1.00 (or 100%), an arbitrage opportunity exists.

Why Do Arb Opportunities Exist?

Bookmakers set odds based on their own models, customer activity, and risk exposure. They don't coordinate with each other. When one bookie adjusts odds due to heavy betting on one side, it can create a gap with competitors who haven't adjusted yet.

These gaps are usually small (1–5%) and often short-lived. That's why speed matters and why automated comparison services like Ozzy Odds exist — manually checking odds across multiple bookmakers on dozens of events would take hours.

Rounding Your Bets

One of the quickest ways to get your bookmaker accounts limited is betting suspicious amounts like $47.57. Normal punters bet in round numbers — $50, $45, $100.

Our calculator shows both the exact (mathematically optimal) stake and a rounded whole-dollar amount. It tests multiple rounding combinations to find one where both outcomes are still profitable.

If the arb edge is too thin (usually under 1% on smaller stakes), rounding may kill the profit. The calculator flags this in red so you know not to place it with rounded amounts.

Tips for Account Longevity

Round to whole dollars — $50 looks normal, $47.83 doesn't.

Don't always bet the same markets — mix in some normal bets occasionally on sports you actually follow.

Don't withdraw immediately after every win — let balances sit for a while.

Vary your timing — don't place both legs of an arb within seconds. Stagger slightly.

Use multiple bookmaker accounts — the more accounts you have, the less dependent you are on any single one getting limited.

Understanding the Risks

Arbitrage betting is low-risk compared to traditional gambling, but it's not risk-free. Here's what can go wrong:

Odds move before you place both bets. This is the biggest risk. You place one side, then the other bookmaker's odds shift and the arb disappears. You're now exposed on one side only.

Bookmaker limits your account. Over time, bookmakers will notice consistent arbing patterns and reduce your max bet amounts. This is inevitable — the question is how long you can extend it.

Bet gets voided. If a bookmaker voids your bet (palpable error, wrong odds, event cancelled), you may be stuck with the other side of the bet exposed.

Draw or third outcome. Two-outcome arbs (H2H markets) only cover win/loss. In sports or markets where a draw is possible (e.g. soccer, some rugby league markets), a draw result could mean both bets lose. Always confirm you're covering all possible outcomes, or understand the exposure if you're not.

Calculation error. Entering the wrong odds or stake into the calculator means your bets won't be balanced. Always double-check.

None of these are catastrophic on any single bet, but they're real. Never risk more than you can afford to lose on any single arb, and always verify odds in the bookmaker app before hitting place.

Getting Started Checklist

1. Open bookmaker accounts. Sign up with at least 4–6 major Australian bookmakers. Verify your identity on all of them before you need to act quickly on an alert.

2. Fund your accounts. Spread your starting capital ($300–$500 minimum recommended) across your bookmaker accounts. You need funds ready to go in multiple accounts to act on opportunities.

3. Install Telegram. Download the Telegram app and make sure notifications are turned on. Speed matters.

4. Learn the calculator. Practice with our arbitrage calculator using example odds before placing real money.

5. Use the tracking assistant. When an alert comes through, tap "Start Tracking Arb" to have the assistant monitor the market for you and notify you if odds shift before you can place.

6. Start small. Place a few small arbs to get comfortable with the process before scaling up your stakes.

7. Subscribe. When you're ready, join Ozzy Odds to start receiving live arb alerts across licensed Australian bookmakers.