Casino marketing is built on numbers that sound better than they are. These calculators recompute them from the actual maths, run entirely in your browser, and are free to use and share.
A headline bonus is a marketing number. This works out what the offer is actually expected to be worth once wagering, game contribution and the house edge are applied.
"96% RTP" sounds like you keep 96% of your money. Over a real session, the spread around that average is far wider than the average itself. Move the sliders and look at the range, not the middle.
The big multipliers sit at the edges because the ball almost never gets there. These are the exact probabilities of each bucket, computed from the binomial distribution the game is built on.
Every extra tile you reveal multiplies your payout because it multiplies your chance of hitting a bomb. Here is the exact survival probability and the multiplier a zero-edge game would pay.
A 1.5x cashout feels safe. It busts roughly a third of the time. This shows the true probability of reaching each multiplier, and how long you typically wait for one.
Recompute a round yourself. Paste the revealed server seed, your client seed and the nonce, and this reproduces the result in your browser using HMAC-SHA256 — nothing is sent to us.