UK Slot RTP Calculator
Calculate expected session cost and bonus EV. Based on verified maths — not marketing.
Session Cost Calculator
Bonus EV Calculator
January 2026 UKGC 10× wagering cap. Formula: Bonus − (Wagering × Bonus × House Edge)
Understanding These Numbers
Session cost is the mathematical expected loss — not what you will necessarily lose. Individual sessions vary enormously due to variance. The expected value applies only over thousands of sessions. A single session can result in profit or a large loss regardless of RTP.
Bonus EV formula: Bonus − (Wagering × Bonus × House Edge). £50 bonus at 10× on 96.5% RTP: £50 − (10 × £50 × 0.035) = £32.50 positive EV. This assumes completing all wagering — not guaranteed if you lose first. See: RTP guide • Buy bonus explained.