Mines Probability Calculator

Formula used

P(survive k)=C(25−m,k)/C(25,k) · M₉₉=0.99/P(survive k)

What this tool calculates

Adjust mine count and safe picks to calculate 25-tile Mines survival probability, next-tile mine risk, safe chance and the 99% RTP multiplier.

Survival probability per Mines click

On a uniformly randomized 25-tile board with m mines, after k safe picks the next safe chance is (25 - m - k) / (25 - k). Cumulative survival from the start is C(25 - m,k) / C(25,k). These answer different questions.

With 3 mines, the first safe chance is 22/25 = 88%. After one safe pick, the next safe chance is 21/24 = 87.5%. Surviving both picks from the start has probability 0.88 × 0.875 = 77%.

What the multiplier means

For two safe picks in that example, a 99% RTP model gives a gross multiplier of 0.99 / 0.77, approximately 1.285714x before rounding. Actual payout rounding and provider rules can differ.

Safe picks reveal information about the remaining board; they do not make another unknown tile safer. Once all safe tiles have been cleared, the next safe chance is zero.