Rust Mines EV calculator
- Probability of reaching this stop
- 66.96%
- Cash-out multiplier
- 1.47x
- EV per $1 bet
- $0.9843
Base edge is 1%. The paid multiplier is truncated to 2 decimals, so the real edge is 1%–1.7% (EV per $1 ≈ $0.982–$0.99) depending on mine count and stop point — matching the server's payout exactly.
The math
With N mines on a 25-tile grid, after K safe clicks the probability that the (K+1)-th click is safe is (25 - K - N) / (25 - K). The cumulative probability of all first K clicks being safe is the product of those terms.
Fair multiplier = 1 / probability. Rust Snowball applies a flat 1% house edge, so the actual payout multiplier is 0.99 × fair multiplier. EV per $1 = probability × multiplier = 0.99 — the 1% edge eats exactly 1 cent of every $1, regardless of mine count or stop point.
Related
Frequently asked questions
- How does the Mines EV calculator work?
- On a 5×5 grid with N mines and K safe clicks, win probability = product of (25-k-N)/(25-k) for k in 0..K-1. Fair multiplier is 1/probability; we apply a flat 1% house edge so actual multiplier is 0.99 × fair.
- Why is EV always ~$0.99?
- Flat 1% house edge across every mine count and stop point. RTP is 99% regardless of strategy.
- Does mine count matter for EV?
- No. EV per $1 is ~$0.99 at every count. Mine count controls variance (3 mines = low, 24 mines = lottery) but not EV.
Ready to play?
Sign in with Steam in one click. Free 0.15 gem signup gift, no email needed.