The headline "100% up to £500 + 200 free spins" is meaningless without understanding what the wagering requirement does to the actual value. A £500 bonus with 50x wagering is worth far less than a £100 bonus with 20x wagering — sometimes the smaller offer is worth 5x more in real cash. This calculator strips the marketing from the maths.

Enter the bonus amount, wagering requirement, game RTP, and your typical bet size. The calculator returns the expected bonus value (after wagering losses), the bonus-to-deposit ratio, and the percentage of the bonus you are likely to convert to withdrawable cash. Most UK casino bonuses convert at 30–60% of the headline value — meaning a "£500 bonus" is realistically worth £150–£300 in withdrawable cash.

For comparison shopping between casinos: enter each casino's offer into the calculator and compare the real expected value, not the headline number. Also pair with our bonus terms decoder to understand the max bet rule, game weighting, and win cap — these all affect the actual bonus value beyond wagering alone.