A middle is a bet on both sides of a total or spread at different lines, leaving a gap where both bets can win. This calculator takes your Over and Under lines, their odds, and your stakes, then shows the middle window, your profit if the result lands inside it, and the small loss if it does not.
How middle bets work
You bet the Over at a low line and the Under at a higher line — for example Over 45.5 and Under 48.5. If the final result lands strictly between the two lines, both bets win and you scoop a double payout. That gap is the "middle".
Outside the window, exactly one side wins and the other loses, so your outcome is a small profit or a small loss depending on the odds and stakes. A well-priced middle risks a little to win a lot: the downside is capped and the upside is the double win.
The calculator shows every case — Over wins only, the middle hits, Under wins only, and, when your lines are whole numbers, each exact scoreline that refunds one leg — so you can judge whether the middle window is worth the cost of entering it.
Worked example
Bet Over 45.5 at 1.95 for $100, and Under 48.5 at 1.95 for $100. Your total stake is $200 and the middle window is 46 to 48.
If the result is 46, 47, or 48, both bets win: 2 × ($100 × 1.95) − $200 = $190 profit. That is the middle hitting.
If the result falls outside 45.5–48.5, one side wins and one loses: $195 − $200 = a $5 loss. So you risk $5 for a shot at $190 — the classic middle risk-reward.