What an odds boost is
A sportsbook promotion that pays better odds than normal on a set bet, like a parlay going from +400 to +500. They usually have a low maximum stake.
Odds boost calculator
Enter the normal odds, the boosted odds and your stake. See the extra profit, how big the boost really is and roughly how much edge it gives you.
Extra profit from the boost$25.00
Profit at normal odds$100.00
Profit at boosted odds$125.00
Boost size+25.0% profit
Implied chance: normal → boosted20.0% → 16.7%
Edge if the normal odds were fair+$5.00 (20.0%)
The normal price already includes the sportsbook's margin, so the real edge is smaller than shown. A boost has value when the boosted odds beat the fair odds: use the no-vig calculator to find them.
For information only. Results use the odds you enter and don't include any sportsbook rules or limits.
How it works
Odds boost calculator: the basics
Boost size
A boost from +400 to +500 adds 25% to the profit. Compare boosts by this number rather than by how big the odds look.
When a boost has value
The normal price includes the sportsbook's margin. A boost only gives you an edge when the boosted odds beat the fair odds, the price with that margin removed.
Straight bets beat long parlays
Boosts on straight bets often give real value. Boosts on long-shot parlays can still carry a big margin even after the boost.
Terms used here: Odds boost · Fair odds · Vig · Full glossary
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FAQ
Odds boost calculator questions
How do I calculate an odds boost?
Work out the profit at the normal and boosted odds and compare. $25 at +400 profits $100; at +500 it profits $125, so the boost adds $25 (25%).
Are odds boosts worth it?
Often, on straight bets where the boost beats the fair odds. Long parlay boosts can look generous but still favour the sportsbook. Compare with the no-vig price.
Why is there a max stake on boosts?
Boosts can give bettors an edge, so sportsbooks cap the stake, often between $10 and $50, to limit what they can lose.