Bonus expected value is the mathematical worth of a casino or sportsbook bonus to a player after accounting for its terms: the bonus or matched amount, the wagering requirement, the game weighting or minimum odds, the maximum cashout, the maximum bet while active, the expiry, and the house edge of the eligible games.
Definition
Bonus expected value is the mathematical worth of a casino or sportsbook bonus to a player after accounting for its terms: the bonus or matched amount, the wagering requirement, the game weighting or minimum odds, the maximum cashout, the maximum bet while active, the expiry, and the house edge of the eligible games. It is calculated as the expected value of the required play minus the expected losses incurred while meeting the wagering, giving a figure that can be positive (the bonus is worth taking) or negative (playing through it costs more than the bonus is worth).
Most real-world casino bonuses have a small positive EV if played optimally with a low-house-edge eligible game, a negative EV if played on high-edge games or with realistic imperfect play, and a strongly negative EV if the terms are onerous (very high wagering, tiny cashout cap, sticky bonus). The EV calculation is what turns "is this bonus good?" from marketing impression into arithmetic.
In context
For affiliates, bonus EV is the rigorous version of the bonus comparison that most content does badly. Instead of ranking offers by headline match percentage, content that computes the approximate EV of each bonus under its actual terms — showing the wagering, the eligible game and its house edge, the cashout cap, and the resulting expected value — gives readers a genuine basis for choosing, and it exposes offers whose big headline number hides terms that make them worthless or negative.
This is the kind of accurate, worked-through content that performs in a YMYL niche and builds trust.
The honest framing has limits to state. A positive-EV bonus is only positive if played to the required strategy (specific low-edge game, minimum bets, clearing before expiry) and over enough plays for the EV to matter; realistic players deviate and get less.
Bonus EV also does not account for the responsible-gambling cost of the extra required turnover — a bonus that requires wagering 35 times a 100 deposit means staking 3,500 to clear it, which is far more exposure than the player may have intended. Content should present bonus EV as a value-comparison tool, always alongside the full terms and the required turnover, and should not imply that a positive-EV bonus is free money or a way to profit reliably.
Age-gating and responsible-gambling framing apply, and the practical message is that the terms, not the headline, determine whether a bonus is worth taking.
Worked example
An affiliate's bonus comparison computes the approximate EV of five welcome offers under their real terms: two are slightly positive if cleared optimally on a 96%+ slot, two are negative because of 45x wagering and a small cashout cap, one is strongly negative as a sticky bonus. It shows the required turnover for each and carries responsible-gambling messaging.
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