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A profit boost is worth exactly what the math says it's worth. Enter your bet's odds, the boost percentage, and the fair (no-vig) odds. You get the boosted price and the expected value before you bet it.
Don't know the fair odds? Take a sharp book's prices on both sides of the bet and strip the vig. Quick how-to below.
A profit boost multiplies the profit of a winning bet, not the total payout. The expected value compares that boosted payout against the bet's true chance of winning:
EV% = (fair win probability × boosted decimal payout) − 1
Worked example: $25 on a +100 bet with a 50% boost pays out like +150. If the fair price is −105 (a 51.2% shot), EV = 51.2% × 2.50 − 1 = +28%, about +$7.00 of expected profit on a $25 boost. That's why books cap boost stakes: used correctly, boosts are among the only casino-grade edges handed to the player.
The market. Take both sides of the bet at a sharp book, say −110 / −110 on a spread. Convert each to implied probability (52.4% each, totalling 104.8%), then divide your side by the total: 52.4 ÷ 104.8 = 50%. That 50% (even money, +100) is the no-vig "fair" price. This is called devigging, and it's the entire foundation of boost math. A dedicated devig calculator is coming; until then, any two-sided market works with the method above.
Profit. A 50% boost on +100 pays +150, because the $100 profit on a $100 bet becomes $150. Every major book (FanDuel, DraftKings, bet365, theScore) applies boosts this way.
Because the underlying bet still carries the book's margin, and boost terms fight you: minimum odds rules push you toward longshots, parlay requirements stack vig on every added leg, and stake caps limit the damage when you do find value. The boost has to be big enough to beat all of that, and often it isn't.
Negative EV is a pass, full stop. Low single digits is thin. Fine at small stakes, but sensitive to your fair-odds estimate being right. Once verified EV gets past roughly 5-10%, a boost is clearly worth its capped stake. Past 15-20% it's the best bet you'll place all week.
The desk runs this exact math on every boost, at every book, every morning, and publishes the results. The free Discord opens soon.