RTP to House Edge Converter — UK 2026
RTP (Return to Player) and house edge are two ways of expressing the same mathematical concept. RTP is the proportion of wagers returned to players on average; house edge is the proportion retained by the house. They sum to 100% — a 96% RTP means a 4% house edge. The calculator below converts between these two representations for any game, and compares the mathematical impact of RTP differences across common UK casino games. Understanding the conversion helps compare games fairly and identify when small-looking RTP differences are actually significant.
RTP / House Edge Converter
Why the Conversion Matters
Casino marketing typically emphasises RTP ("97% return!") while house edge is the more useful decision-making framing. 97% RTP sounds excellent; 3% house edge frames the same mathematics as an explicit cost. For UK player decision-making, house edge framing produces better choices:
"This slot has 96% RTP" — sounds good, implies near-breakeven play.
"This slot has 4% house edge" — explicit about the expected cost per £1 wagered.
Mathematically identical; psychologically very different. The house edge framing is harder to mistake for positive expected value.
Small RTP Differences Matter More Than They Seem
A 2-percentage-point RTP difference (94% vs 96%) appears modest but represents a 50% increase in house edge (6% vs 4%). Across £10,000 total wagered, the difference is £600 vs £400 expected loss — £200 real-money difference for identical entertainment time.
A 1-percentage-point RTP difference (96% vs 97%) represents a 25% reduction in house edge (4% vs 3%). Seek out higher-RTP games where available.
RTP Values to Know
Below 94%: Avoid. Substantially worse than UK baseline. Old slots and some novelty games fall in this range.
94-95%: Below baseline. Accept only for specific gameplay preference that outweighs the mathematical disadvantage.
96%: UK slot baseline. Acceptable mathematical quality.
96.5-97%: Above baseline. Worth seeking for sustained play.
97%+: High-RTP. Specific slots (1429 Uncharted Seas at 98.6%, Big Bad Wolf at 97.34%, White Rabbit Megaways at 97.77%) and specific live variants (Lightning Roulette straight-ups at 97.30%).
99%+: Exceptional. Essentially only Power Blackjack with basic strategy (99.75%) and Blackjack Switch with optimal strategy (99.83%).
See our high RTP slots guide, RTP explained, and house edge explained.
Related Calculators
Session loss calculator — computes expected outcomes for specific session parameters.
EV per hour calculator — hourly expected loss rates for specific games.
Wagering calculator — computes welcome offer expected value under the UKGC 10x cap.
Frequently Asked Questions
Why are RTP and house edge both used?
Same mathematics, different framing. Marketing prefers RTP ("97% return!"); strategic decision-making benefits from house edge framing ("3% cost per wager"). Both are equivalent but psychologically different.
Is a 2% RTP difference significant?
Yes. 94% vs 96% RTP represents a 50% increase in house edge (6% vs 4%) — substantial difference across sustained wagering. £10,000 wagered produces £600 vs £400 expected loss; £200 real difference for identical activity time.
What's the highest RTP at UK casinos?
Blackjack Switch with optimal strategy at 99.83% (specialist variant). Power Blackjack with basic strategy at 99.75%. 1429 Uncharted Seas slot at 98.6%. Big Bad Wolf slot at 97.34%.
What's the worst-value UK casino bet?
Baccarat Tie bet at 8:1 payout: 14.36% house edge. 9:1 payout variant improves to 4.85% — still substantially worse than Banker (1.06%).
Can UK operators vary RTP on the same slot?
Yes. Providers typically offer multiple RTP versions (96.0%, 94.0%, 92.0% common). Operators choose which to deploy. Verify the specific RTP at your operator's version of the slot. See reading slot paytables.