Unit Size

Another term for ROI in betting, representing the average percentage return per bet. Calculated as (Total Profit / Total Staked) x 100. A 5% yield means you return an average of $0.05 for every $1.00 wagered. Yield is the standard measure used to evaluate and compare tipster performance.

A strategy where the bettor identifies and bets on outcomes where the bookmaker's odds are higher than the true probability warrants. A value bet exists whenever the offered odds exceed the fair odds. Over time, consistently placing value bets leads to profit regardless of individual results. This is the core principle behind professional sports betting.

The probability that a bettor will lose their entire bankroll given their edge, bet size, and number of bets. Even profitable bettors face risk of ruin if they stake too large a percentage of their bankroll. Reducing unit size dramatically lowers risk of ruin. A common target is keeping RoR below 1%.

A strategy that exploits odds differences between bookmakers to guarantee a profit regardless of the outcome. By placing proportional bets on all possible outcomes across different bookmakers, the bettor locks in a risk-free return. For example, if one bookmaker offers Home at 2.20 and another offers Away at 2.10, the combined margin may allow a guaranteed profit.

The difference between the odds at which you placed a bet and the final closing odds. If you consistently get better odds than the closing line, you are likely a profitable bettor. CLV is considered the single best predictor of long-term betting profitability, even more reliable than short-term results.

A strategy where you back multiple selections in the same market with different bookmakers, distributing stakes to ensure the same profit regardless of which selection wins. Unlike arbitrage, Dutching does not guarantee a profit on every outcome but can distribute risk while targeting specific outcomes you consider underpriced.