Middle Finder
A middle bet lets you take both sides of the same game at different sportsbooks. When two books post different lines on the same spread or total, a window opens where both your bets can win at the same time. The window size is the point gap between the two lines — any final score that lands inside that gap wins both bets simultaneously.
To use the tool, enter your total bankroll at the top. Each row automatically splits it between both legs using equal-value sizing, so the stakes add up to exactly what you entered. You can see your profit if the middle hits and your maximum loss if it misses. The worst case is losing the vig on one side — typically under $10 per $100. Sort by window size to prioritize the best opportunities, or by date to focus on upcoming games.
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Frequently asked questions
What is a middle bet in sports betting?▾
A middle is when two sportsbooks have the same game listed at different lines, giving you a range of outcomes where both of your bets win. For example, if Book A has Chiefs -1.5 and Book B has Eagles +3.5, you bet Chiefs -1.5 on Book A and Eagles +3.5 on Book B. If the Chiefs win by exactly 2 or 3, both bets win. If not, you win one and lose one — your only cost is the combined vig.
How does the Middle Finder work?▾
Linewhale scans current odds across all major sportsbooks and compares lines for the same game. When two books show enough of a gap on the same spread or total, that game shows up here. The window size tells you how many points separate the two lines — a bigger window means more outcomes where you win both bets.
What does the window size mean?▾
Window size is the point gap between the two lines. A 2-point spread window means two exact margin outcomes result in both bets winning. For totals, a 2-point window means the game total can land on either of two numbers and both Over and Under bets win. Bigger windows are more likely to hit.
What's my risk if the middle doesn't hit?▾
If the middle misses you win one bet and lose the other. Your net loss is the vig on the losing side — typically around $9 on a $100 bet at -110 odds. The stake calculator shows your exact worst-case loss based on the specific lines.
How much should I bet on each leg?▾
Enter your total bankroll at the top of the page. The tool automatically splits it between Leg A and Leg B using equal-value sizing — each leg is sized so that if either side wins alone, your net result is as close to break-even as possible. Your two stakes will always add up to the amount you entered.
Why do both legs sometimes show the same spread, like +1.5 and +1.5 for opposite teams?▾
This happens when two books disagree on who the favorite is — one book lists the home team as the underdog (+1.5) while another lists the away team as the underdog (+1.5). Even though the numbers look the same, these are opposite sides of the same game. A +1.5 spread doesn't require the team to win outright, just to not lose by more than 1. So if the game is decided by exactly 1 point, both teams cover their +1.5 simultaneously — that's the middle. The window is the gap between the two lines when viewed from the same team's perspective: +1.5 vs. -1.5 is a 3-point spread difference.