Definition
Breakeven win rate is the percentage of bets you must win to avoid losing money at a given price. It depends on the odds, because shorter payouts require a higher hit rate.
For negative American odds, the formula is:
Breakeven Win Rate = Risk / (Risk + Win)
For positive American odds, the formula is:
Breakeven Win Rate = Risk / (Risk + Profit)
At -110 odds, you risk $110 to win $100:
110 / (110 + 100) = 52.38%
So a bettor must win more than 52.38% of -110 bets to profit before considering promos, limits, or changing prices.
Worked Example
A point spread is listed at -110. You place 100 bets of $110 each.
If you win 52 bets, you profit $5,200 and lose $5,280 on the 48 losses. Net result: -$80.
If you win 53 bets, you profit $5,300 and lose $5,170 on the 47 losses. Net result: +$130.
That is why the breakeven point sits between 52% and 53%, exactly 52.38%.
Why It Matters
Breakeven win rate helps a bettor compare their projected edge against the price being offered. A pick is only profitable when the bettor’s true win probability is higher than the breakeven rate implied by the odds.