Slot bonus buy calculator
What a bonus buy really costs at your bet size: the price, the expected cost over many buys, how often it pays back its price, and the odds of the max win.
| Mode | Price per buy | RTP | Expected cost, all buys | Pays back its price | At least one pays back | Max win odds | Max win in $ |
|---|---|---|---|---|---|---|---|
| Pick a game with a bonus buy. | |||||||
Expected cost is price × buys × (1 − RTP): the long-run average. Any single run of buys can end far above or below it. "At least one pays back" is 1 − (1 − p)N, where p is the chance a single buy returns its price.
Highest-RTP bonus buys right now
| Game | Mode | Price | RTP | Pays back its price |
|---|---|---|---|---|
| Plinko 10000x | Base 100 | 100× | 98.95% | 1 in 8.20 |
| Plinko 10000x | Extreme 100 | 100× | 98.95% | 1 in 20 |
| Plinko 10000x | High 100 | 100× | 98.95% | 1 in 13 |
| Plinko 10000x | Insane 100 | 100× | 98.95% | 1 in 35 |
| 3D Lightning Plinko | Legend | 100× | 98.48% | 1 in 3.48 |
| 3D Lightning Plinko | Epic | 50× | 98.41% | 1 in 7.37 |
| Lokis Vault | Bonus | 100× | 98.17% | 1 in 4.55 |
| Waylanders Forge | Powerspin | 75× | 98.00% | 1 in 16 |
| Waylanders Forge | Bonus | 100× | 98.00% | 1 in 4.03 |
| Waylanders Forge | Bonus2 | 200× | 98.00% | 1 in 7.83 |
| Waylanders Forge | Bonus3 | 1,000× | 98.00% | 1 in 7.66 |
| Waylanders Forge | Fuspin | 2,000× | 98.00% | 1 in 5.67 |
| Lokis Vault | Powerspin | 50× | 98.00% | 1 in 8.04 |
| Lokis Vault | Extremespin | 1,000× | 98.00% | 1 in 7.74 |
| Chocolate 98 | Mega | 25× | 98.00% | 1 in 23 |
How to read a bonus buy
A bonus buy costs a fixed multiple of your base bet and starts the feature straight away. Its RTP is the share of that price it returns over the long run, so a 100× buy at 96% RTP costs 4× the base bet per buy on average. More in the bonus buy RTP guide.
Get the week's bonus buys sorted by RTP
One email a week: new Engine slots with RTP and max-win odds, RTP changes and the most played games. Free, no casino offers on this site. Unsubscribe any time.