Middles Calculator
Calculate the expected value of a middle opportunity.
Side 1 (e.g. Team A +3.5)
Side 2 (e.g. Team B -2.5)
Estimated chance the result lands between the two lines
How to Use
A middle exists when you can bet both sides of a spread or total and there's a gap where both bets win. For example: Team A +3.5 at Book 1 and Team B -2.5 at Book 2. If Team B wins by exactly 3, both bets win. Enter each side's line, odds, and wager, plus your estimated probability of hitting the middle. The calculator shows your EV across all scenarios.