Know if a boost is actually worth using.
Enter the original odds, exact boosted odds or boost percentage, fair win probability, stake cap, and promo rules. BonusBell shows boosted EV, break-even probability, promo value, and whether the terms still qualify.
Manual first, bonus-ready
No sportsbook linking or live odds feed required. Use no-vig odds, a sharp line, or your own model, then send promising promos into Bonus Extractor.
Promo inputs
Exact boosted odds override the boost percent. If a book gives only a percentage, BonusBell applies it to the profit portion of the odds.
Quick scenarios
Load common sportsbook promo shapes, then edit the terms.
Fair probability versus boosted break-even
100% means your fair probability equals the boosted break-even point.
Before you use the promo
A boost is only valuable when the price, rules, and stake cap all work together.
Use a fair line
The cleaner your no-vig or sharp reference, the less likely you are to overrate a flashy boost.
Respect the cap
A huge boost with a tiny max stake may still be worth less than a plain better price elsewhere.
Read the terms
Minimum odds, markets, leagues, bet type, expiry, and max win rules can erase the value.
Watch parlays
Parlay boosts need extra care because leg correlation and payout rules can change the true price.
Boost math
Supports exact boosted prices plus percentage profit boosts.
Fair comparison
Compare boosted break-even probability against your fair probability.
Terms check
Stake caps, minimum odds, and parlay leg rules are part of the result.
No linking
Everything works from manual inputs before live odds automation is ready.
How this fits the BonusBell workflow
Use this calculator for quick boost EV, Parlay Inspector for multi-leg fair pricing, and Bonus Extractor when the promo should become a saved bonus with terms, expiry, and extraction planning.
Top platforms for these tools
Top-rated platforms reviewed by our editorial team.