How we calculate bonus EV

Every BonusOz review uses the same transparent model so you can reproduce our numbers.

The formula

For a bonus of amount B with wagering multiplier W, total required turnover is B × W. At an assumed slot return-to-player of 96% (RTP), expected loss while clearing is turnover × (1 − RTP). The bonus's expected value is then:

EV = B − (B × W × (1 − 0.96))

Worked example

A $200 bonus at 40x wagering requires $8,000 of turnover. At 96% RTP that is $320 of expected loss, so EV = $200 − $320 = −$120. The headline percentage is irrelevant — what matters is what you keep after wagering.

What the model deliberately simplifies

We assume 96% RTP and full game contribution. Real outcomes vary with the games you play, max-bet rules, excluded games, expiry windows and country restrictions. Each review lists what to verify on the live site, and our calculator lets you plug in the exact current numbers.

Try it: the free EV calculator.