RTP calculator
Enter a bet size and a number of spins, then the RTP versions you want to compare. The calculator shows the total wagered and the average loss at each version, plus the gap to the best one in dollars. It works with long-run averages, and your own session will land somewhere either side.
Calculator
- Total wagered
- $1,000.00bet × spins
- Expected loss at 96.5%
- $35.00the best version below
| RTP % | Loss | Paid back | Vs best | Remove |
|---|---|---|---|---|
| $35.00 | $965.00 | – | ||
| $40.00 | $960.00 | $5.00 | ||
| $60.00 | $940.00 | $25.00 | ||
| $80.00 | $920.00 | $45.00 | ||
| $120.00 | $880.00 | $85.00 |
Formula: total wagered × (1 − RTP). An average over a very long run; one session can land far above or below it.
Runs in your browser. Nothing you type is sent or stored.
Setting it up
Put in your usual bet and a spin count you'd actually play, 500 on a weeknight or 3,000 over a weekend. The table starts with five versions, 96.5 down to 88. Overwrite them with the numbers your slot's studio publishes. The × removes a row and Add a version puts one back, up to eight.
The top RTP you enter becomes the yardstick. Vs best is what each lower version costs you on top of it for the same play. The version a casino actually runs sits in the slot's paytable or help screens, usually near the bottom.
- Total wagered
- bet × spins
- Loss
- total wagered × (1 − RTP)
- Paid back
- total wagered × RTP
- Vs best
- total wagered × (best RTP − this RTP)
Worked example: Le Bandit at $0.50
| RTP | Average loss | Paid back | Vs best |
|---|---|---|---|
| 96.34% | $54.90 | $1,445.10 | $0.00 |
| 94.23% | $86.55 | $1,413.45 | $31.65 |
| 92.17% | $117.45 | $1,382.55 | $62.55 |
| 88.36% | $174.60 | $1,325.40 | $119.70 |
calc.py, 12 Nov 2026. RTP versions from the Le Bandit page on hacksawgaming.com (read 12 Nov 2026).
Same game, same bet, same spins, and the lowest setting costs a bit over three times the top one. The reels look identical at every setting. Open the rules before spinning and check the number there.
How far one session can land from the average
The calculator gives the average. Your night at the slot is a single draw, and how wide it can swing is a property of the game. Engine Insights gives each Stake Engine slot a one-spin standard deviation, which is enough to size that swing.
| Slot (studio) | SD per spin | Average loss | SD of the session | Spins before the average loss reaches one SD |
|---|---|---|---|---|
| Tongue Game (Twist Gaming) | 12.39 | $33 | $392 | about 141,000 |
| Ganja Snail (Donut Gaming) | 27.38 | $33 | $866 | about 688,000 |
| Odins Vault (Valkyrie) | 169.38 | $33 | $5,356 | about 26.3 million |
Own numbers from the Engine Insights snapshot (RTP and standard deviation as listed for the games, fetched 2026-11-12). Session SD = one-spin SD multiplied by √1,000, times $1. Last column = (SD ÷ (1 − RTP))².
All three cost the same $33 on average for a thousand $1 spins. On Tongue Game, a normal session still ends a few hundred dollars either side of that. On Odins Vault, one big hit or none decides the night, and the RTP needs about 26 million spins before it shows through the noise. A gap like the $119.70 between Le Bandit's top and bottom versions hides inside swings of this size, so you won't notice it in a weekend. You still pay it every time you play the low one.
18+. RTP describes millions of spins, not your next hour, and even the top version keeps an edge. Support: Responsible gaming. No ties to Twist Gaming, Donut Gaming, Valkyrie or Hacksaw Gaming; names stay with their owners.
Questions
How do you calculate expected loss from RTP?
Multiply the total you bet by (1 − RTP). 2,000 spins at $0.20 is $400 wagered, and at 96% the average loss is $16.
Does a higher RTP mean I will win more often?
Not necessarily. RTP sets the average return. Hit rate sets how often wins come, and volatility how big they get.
Where is the RTP version a casino runs?
Inside the slot, in the help or paytable pages. Studios with several versions list all of them on their own game pages, so you can compare.
Can the calculator tell me if I will win today?
No. It shows the long-run average for the play you enter. Tonight could finish well above or well below that.
Sources
- Hacksaw Gaming: Le Bandit. Four versions listed: 96.34, 94.23, 92.17 and 88.36 percent Checked 12 November 2026
- Engine Insights (public API, snapshot). 30 days, 13 Oct to 11 Nov 2026 Checked 12 November 2026
18+ · Play responsibly · gamblingtherapy.org