How Is Classic Slot RTP Calculated? Three-Reel Weights and Published V1 at 61.5375%

Direct answer

The current Published V1 three-reel model has exact RTP4923/8000=61.5375%. The95% Slot V2 models remain DRAFT candidates and must not replace published truth.

Quick facts

Reels

3

Published V1 RTP

61.5375%

House Edge

38.4625%

Hit Rate

7.9%

01

Turning reel weights into outcome probability

All three reels use the same weights: Cherry35, Lemon30, Bell20, Star10 and Seven5, totaling100.

Three Cherries therefore occur with probability(35/100)^3=4.2875%, while three Sevens occur with(5/100)^3=0.0125%.

02

Published V1 pays only five triple combinations

V1 payout rules are Cherry5×, Lemon8×, Bell15×, Star40× and Seven200×. Every other three-symbol combination pays zero.

Overall hit rate is therefore the sum of those five triple probabilities:79/1000=7.9%.

03

Exact RTP and house edge

RTP=Σ P(triple symbol i)×multiplier(i). Summing the five winning combinations gives4923/8000=61.5375%.

House Edge=1−RTP=3077/8000=38.4625%. That unusually low RTP is not a calculation error; it is the exact result of the Published V1 payout table.

04

Publication boundary: Draft is not Production

The repository also contains Slot V2 Candidate A and B, both mathematically verified at exact95% RTP, but they remain DRAFT candidates.

A separate5×6,28-payline Slot math prototype targets96.7%. These are different models. Public SEO should use the active published config as production truth rather than substituting a more attractive draft number.

EXAMPLE

Published V1 exact values

• Cherry triple:0.35³×5=21.4375% RTP contribution
• Lemon triple:0.30³×8=21.6%
• Bell=12% · Star=4% · Seven=2.5%
• Total=61.5375% · House Edge=38.4625% · Hit Rate=7.9%

Frequently asked questions