Break-Even Win Rate Calculator

Where 52.38% comes from

At -110 you risk 110 to win 100. To break even you need wins to cover losses plus the margin, which works out to 110 divided by 210, or 52.38%. That is the bar. Anything below it loses money over time no matter how it feels, and the gap between 50% and 52.38% is exactly the house edge doing its work.

Why this number is the honest test of a record

A handicapper advertising 54% is claiming an edge of about 1.6 points. That is a real and respectable edge if it holds up. A handicapper advertising 65% over a meaningful sample is claiming something that essentially does not exist in liquid markets. The break-even figure is what turns a win rate from a marketing number into something you can assess.

Break-even changes with the price

At -110 you need 52.38%. At -120 you need 54.55%. At +100 you need 50%. At +150 you need 40%. This is why comparing win rates across bettors without knowing the odds they took is meaningless, and why a 48% win rate on underdogs can be far more profitable than a 55% win rate on favourites.

What a realistic edge looks like

Sustained performance in the mid-50s is strong. Long-run results in the high 50s at standard pricing are exceptional and rare. The reason is simply that markets are efficient enough that large persistent edges get bet away. Anyone presenting a long-term record well above that range deserves more scrutiny, not more trust.

Sample size is the other half

A 60% record over 40 bets tells you almost nothing, because that result occurs by chance often enough to be unremarkable. Several hundred graded bets is where a win rate starts carrying information, and even then the confidence interval is wider than most people expect. Judge a record by its size and transparency before you judge it by its percentage.