Check the product terms first
bet365's Bet Boost FAQs provide one first-party example of eligibility, selected events and markets, maximum stakes and settlement conditions; any operator can change its terms. Betfair's sportsbook rules provide another operator example for enhanced-price bets. Neither source describes every boost product.
Payoff calculation
Suppose the ordinary available price is 2.00 and an eligible boost offers 2.20 with a 10-unit maximum stake:
- Ordinary profit on 10 units = 10 x (2.00 - 1) = 10.00 units.
- Boosted profit on 10 units = 10 x (2.20 - 1) = 12.00 units.
- Incremental winning profit = 12.00 - 10.00 = 2.00 units.
The price improvement is real under those assumptions. It says nothing by itself about the probability or expected value of the selection.
Comparison table
| Check | Evidence to record |
|---|---|
| Base comparison | Executable non-boosted price at the same timestamp |
| Boosted price | Accepted receipt price |
| Stake cap | Maximum amount eligible for boost |
| Eligibility | Customer, event, market and bet-type conditions |
| Expiry | Offer closing time |
| Settlement | Voids, pushes, errors and maximum returns |
Expected value still needs a probability
At an estimated win probability of 48%, EV at 2.00 is 0.48 x 2.00 - 1 = -0.04 units per unit. At 2.20 it is 0.48 x 2.20 - 1 = 0.056 units. The conclusion changes only under the stated 48% estimate, which requires independent validation. OpenStax gives the expected-value basis.
Measure the benefit across the intended stake
A boost may apply only to part of the amount a reader intended to place. Suppose 10 units can be accepted at boosted odds of 2.50 and a further 40 units at the ordinary price of 2.20. Winning gross return is 10 x 2.50 + 40 x 2.20 = 113 units. Across the 50-unit total, the blended decimal price is 113 / 50 = 2.26. Describing the whole position as 2.50 would overstate the payoff.
Compare the boosted receipt with an executable base price captured at the same time. A crossed-out reference price, an earlier quote or a different market is not a reliable counterfactual. Also separate a true odds increase from a free-bet token or refund feature, because stake return and settlement can differ.
Offer audit
- Save the dated first-party terms.
- Record market, selection, ordinary price and boosted price.
- Confirm the eligible customer, stake cap and expiry.
- Calculate ordinary, boosted and blended gross return.
- Apply settlement restrictions and maximum returns.
- Keep the probability assessment independent of the promotion.
The higher accepted payoff is straightforward to calculate. Whether the bet is suitable or has positive estimated value remains a separate, evidence-dependent question.
Related resources
Use odds comparison for the base-price record and fair odds for probability terminology.
Continue learning
- Next guide: Handicap Odds
- Related guide: How to Read and Calculate Decimal Odds
Assumptions and limitations
The bet365 example was last read in July 2026. The examples are illustrative and exclude restrictions not shown in the stated inputs. A boost can encourage an otherwise unplanned bet; a higher price does not remove loss risk or make the selection suitable.
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