Middle betting calculator
Two lines, one window where both sides win.
The two bets
Over at one book, Under at another, with the Under line higher.
$
%
Your own estimate of how often the result lands in the window.
What you get
Stakes are split so the two losing-side results pay the same. Whole-number lines can push, with the stake refunded.
Worst case-$4.50-$4.50
Lands on 46, 47 → both win
Stake on Over 45.5
Stake on Under 47.5
Best case
Break-even hit rate
Middle needs to land this often
- Under 47.5 only
-$4.50-$4.50 - Middle (46, 47)
$91.00$91.00 - Over 45.5 only
-$4.50-$4.50
How it works
- Take Over the low total and Under the high one (or the dog's + line and the favourite's − line).
- If the result lands between the two lines, both bets win.
- Outside the window one side wins and the other loses — usually a small cost.
Betting involves risk. Bookmakers can restrict or close accounts and void bets, automation can fail, prices move, and a positive expected value (+EV) bet can still lose. Promotions carry each bookmaker's own terms. There is no guarantee of profit. See responsible gambling for limits and support.
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All toolsBy the B337 team. Last updated .