How to Beat the Bookmaker's Overround
The overround is the built-in margin that makes bookmakers money. Here's how to reduce and beat it so more of the value stays with you.
Every bookmaker market is priced with an overround — a margin that means the odds add up to more than 100% probability, guaranteeing the bookmaker an edge. Beating it is the essence of long-term profit. This guide shows you how, building on what is a bookmaker's margin (overround)?.
Understand what you're up against
In a fair market the implied probabilities would total 100%. The overround pushes them above that, so on average bettors pay a tax on every bet — the source of the bookmaker's profit.
The bigger the overround, the harder it is to win.
Always take the best price
The simplest way to shrink the margin you pay is to line shop and take the biggest available odds on every bet. Across many bets, this directly cuts the effective overround you face.
Even 2-3% better prices transform long-term results.
Use low-margin markets and exchanges
Overrounds are smaller in competitive, high-liquidity markets and much smaller on betting exchanges, which only take a small commission. Sticking to low-margin markets keeps more value in your pocket.
Obscure markets often carry fat margins — tread carefully.
Find value beyond the margin
Ultimately you beat the overround by consistently backing prices bigger than the true chance — genuine value betting — and by beating the closing line.
A tipster who beats the overround for you shows up as real profit on your own tracked record.
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Last reviewed 18 August 2026 · Written and fact-checked against our review policy and scoring methodology.
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