Guide · 7 min read
Odds boosts: how to check whether a boosted price is really value
A boosted price looks generous by design. Whether it is actually better than the market depends on one comparison: the boosted odds against the fair odds without the bookmaker's margin. This guide shows that comparison, the boost types you'll meet, why the maximum stake is so small, and how a boost can become one leg of a sure bet.
Updated 22 October 2026
Contents
Types of odds boosts
Bookmakers use boosts to get attention for a match or a market. They come in a few forms:
- Single-price boosts (“super odds”, “enhanced odds”, “price boost”). One selection is offered at a higher price than usual, for example “was 2.50, now 3.00”.
- Profit boosts. A token that raises the winnings of a bet by a percentage, such as +25%. The boosted odds are 1 + (odds − 1) × (1 + boost).
- Boosted accumulators and bet builders. Several selections combined, then boosted. These start from prices with a large built-in margin.
- New-customer enhanced odds. A very high price on a favourite for a small first bet, with the extra winnings often paid as free bets rather than cash.
Slovak bookmakers often call their boosted prices “superkurz” or “navýšený kurz”; in Austria and Germany “Quotenboost” or “erhöhte Quote” is common. The name tells you nothing about the value.
Is the boost really better? Compare it with fair odds
The “was” price in a boost advert is the bookmaker's own price, margin included. The useful comparison is the fair price: the market's best estimate of the true probability, with the margin removed. You get it by taking prices from a sharp, high-volume market and devigging them, as the guide to no-vig fair odds explains. Then:
edge = boosted odds / fair odds − 1
expected value = stake × edge
A bookmaker boosts a home win from 2.30 to 3.00, maximum stake €10. Prices at other bookmakers, devigged, give fair odds of 2.40 (a win probability of about 41.7%).
Edge = 3.00 / 2.40 − 1 = +25%. Expected value of a €10 bet = +€2.50.
The same boost to only 2.45 would be worth 2.45 / 2.40 − 1 ≈ +2%, or €0.21 on €10. A boost “from 2.10 to 2.35” on that outcome would still be below fair: −2%.
Expected value is an average over many bets, not what happens on this one. The uncovered €10 bet above loses €10 more often than it wins. The expected value guide covers the idea in more depth.
If the bookmaker passes on a betting duty, use the price you effectively get. In Austria sports bets carry a 5% duty on the stake; a bookmaker that deducts it from the payout turns 3.00 into roughly 3.00 × 0.95 = 2.85. See the Austrian betting duty guide.
Profit boosts and boosted bet builders
A profit boost changes only the winnings part of the odds:
boosted odds = 1 + (odds − 1) × (1 + boost)
A 25% profit boost on odds of 2.20 gives 1 + 1.20 × 1.25 = 2.50. Whether that is value depends again on fair odds: if fair is 2.30, the edge is 2.50 / 2.30 − 1 ≈ +8.7%. Many profit boosts cap the extra winnings, so check the cap before choosing high odds.
Bet builders and accumulators are where boosts most often mislead. Each selection carries a margin, and in a builder the bookmaker also prices the correlation between selections, usually conservatively. If a builder is quoted at 6.00 while its fair price is about 7.50, a boost to 7.00 still leaves an edge of 7.00 / 7.50 − 1 ≈ −6.7%. The boost reduces the loss; it doesn't create value. Since fair prices for builders are hard to estimate, treat their boosts with caution.
A boost as one leg of a sure bet
When a boost pushes a price far enough, it can form a sure bet with the best price on the other outcome at another bookmaker. The test is the same as always: the sum of 1 / odds over all outcomes is below 1.
Tennis, two outcomes. Boosted 3.00 on Player A at Bookmaker 1, maximum stake €10. Best price on Player B: 1.75 at Bookmaker 2.
1/3.00 + 1/1.75 = 0.3333 + 0.5714 = 0.9048, so the pair returns about 10.5% on the total stake. The boost pays €30.00 if A wins, so the cover is €30.00 / 1.75 = €17.14, rounded up to €17.15.
| Outcome | Payout | Total staked | Result |
|---|---|---|---|
| Player A wins | €30.00 | €27.15 | +€2.85 |
| Player B wins | €30.01 | €27.15 | +€2.86 |
In this example the result is about the same whichever player wins, if both bets are accepted at the shown odds and stand. The guide to good arbitrage percentages puts 10.5% into context: that is far above what ordinary sure bets offer, which is exactly why boosts come with tiny maximum stakes.
Covering trades the uncovered expected value (+€2.50 above) for a result that doesn't depend on the match. On a three-way market such as 1X2 you need two cover bets, one for each other outcome. The ArbVantage sure bet calculator splits the stakes for two or three outcomes.
Maximum stakes and the small print
Boosts usually allow €5 to €50, sometimes less for accounts the bookmaker has already restricted. Points to check:
- Above the maximum. Some bookmakers reject the excess, others accept it at the normal price. Your cover must match what is actually accepted.
- How the extra is paid. On some offers the difference between the normal and the boosted price is paid as a free bet or bonus, not cash. Cover only the cash part, and value the rest separately (see converting free bets).
- Single use and eligible bets. One bet per customer, singles only, no cash-out, a deadline before kick-off.
- Settlement rules. Retirements in tennis, extra time and void rules differ between bookmakers. If the two legs are settled differently, both can lose. See voided bets and palpable errors.
Promotion terms differ between bookmakers; always check the terms and conditions.
Boosts and account limits
Bookmakers know that boosts are often priced above fair. That is part of the marketing budget, aimed at customers who also bet on ordinary prices. An account that only ever takes boosts, always at the maximum stake and often covered elsewhere, tends to be noticed. Common reactions are lower maximum stakes on boosts, exclusion from promotions, or general stake limits. The guide on how bookmaker limits work explains the mechanics. Nothing prevents limits, and no method makes an account immune to them.
Check the boosted price on the bet slip before placing the cover. Boosts can be withdrawn or reach their total liability within minutes, and a cover without the boosted leg is just an ordinary bet.
Frequently asked questions
Are odds boosts always value?
No. A boost is only value if the boosted odds are above the fair odds without the margin. Many single-price boosts are, but boosted accumulators and bet builders often stay below fair because their starting price carries a large margin.
Why is the maximum stake on a boost so low?
Because the boosted price is often above fair, so the bookmaker expects to lose money on it. A low maximum stake keeps that cost small and limits how much any one customer can take. Restricted accounts sometimes get an even lower maximum.
Can I cover an odds boost?
Often, yes. If the boosted price and the best price on the other outcome at another bookmaker add up to less than 1 in 1/odds terms, the pair is a sure bet. Size the cover so that both outcomes pay about the same, and check that the boost and both bets are accepted at the shown odds.
How do I calculate a profit boost?
Boosted odds = 1 + (odds − 1) × (1 + boost). A 25% profit boost on 2.20 gives 2.50. Then compare 2.50 with the fair odds to see whether the bet has a positive edge.
Sources
- Štrumbelj (2014): On determining probability forecasts from betting odds, International Journal of Forecasting 30(4)
- Clarke, Kovalchik, Ingram (2017): Adjusting Bookmaker's Odds to Allow for Overround, American Journal of Sports Science 5(6)
- Austria: Gebührengesetz 1957, § 33 TP 17 (betting duty), RIS
Betting involves risk: odds change, bets get voided, bonuses get withdrawn and accounts get limited. Only bet money you can afford to lose. Our responsible gambling page lists free help.
Not betting, legal or tax advice. 18+. As of October 2026. See our disclaimer.