Free tool
Enter the original price, boost percentage, and stake. We show the boosted price, payout, and price-lift math.
No. A boost only changes the payout math. The event probability is exactly the same before and after the boost.
The calculator compares boosted profit to unboosted profit at the original price's break-even probability. Your real result still depends on the event.
No. Read the terms, maximum stake, market restrictions, and expiration. A better price is still just a price.
A boost improves the price, not the probability. The EV delta shown uses the original listed price's break-even probability; the real result still depends on the event. 21+ · Bet responsibly
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The honest explainer
A profit boost changes the price, not the probability. Whether the boosted price clears fair value depends entirely on what the unboosted market says the outcome is worth — which is what this calculator measures.
Books cap boosts small for a reason: an above-fair price is real money, and they know exactly how much they're giving away. The cap, not the percentage, is usually the number that matters.
A 50% boost turns +100 into +150, capped at $25. If the fair probability is 50% (a true coin flip), the boosted bet's expectation is 0.5 × $37.50 − 0.5 × $25 = +$6.25. Real, positive — and $6.25. The same offer with a $5 cap is a $1.25 decision dressed up as a 50% headline.
The part the paid-tool ads leave out: You will get limited — read the honest guide →