How do you calculate the expected value of a casino bonus?

Use this formula: Real Value = Bonus Amount × (1 − House Edge × Wagering Requirement). For example, a 1 BTC bonus with 40x wagering requirement played on slots with a 3% house edge: 1 × (1 − 0.03 × 40) = 1 × (1 − 1.2) = −0.2 BTC. That bonus costs you 0.2 BTC to clear. If the result is negative, skip the bonus.