The maths behind your session
RTP Reality Check
See how RTP, bet size and session length affect your expected cost. A long-term average, never a promise for one session.
Your session estimate
Updates as you typeExpected session loss
Calculating your session estimate…
- Final bankroll (expected)
- —
- Total wagered
- —
- Expected return (payouts)
- —
House edge
That's an average loss of — per $100 wagered.
These averages assume you complete every spin at the same bet. Your bankroll may run out sooner; actual payouts can be very different.
Explore variance & outcome estimates
Illustrative only: these simplified models do not use a specific slot's payout table and cannot predict your session.
Illustrative bankroll ranges
Modelled outcomes
Read the numbers
What RTP actually tells you
RTP describes the theoretical share of all wagers returned over a very large number of spins. It is not the percentage of your starting bankroll you will get back.
| Slot RTP | Average loss per $100 wagered |
|---|---|
| 98% | $2 |
| 96% | $4 |
| 92% | $8 |
Why is total wagered more than my bankroll?
Winnings can be wagered again. At $1 per spin, 500 spins means $500 wagered, even if you started with $100. Expected loss is based on that total wagered amount.
How does variance change the result?
Lower variance generally means smaller, more frequent payouts. Higher variance means larger swings and rarer big payouts. It changes the spread of possible results, not the expected loss at a given RTP.
Will a longer session get me closer to RTP?
An average may settle towards the theoretical RTP over many spins, but there is no fixed number of spins that guarantees it. More wagering also increases expected loss. Playing longer does not recover earlier losses.
How are these estimates calculated?
Expected loss = bet per spin × number of spins × house edge. Expected return is the theoretical total paid back, including any money you wager again. Final bankroll subtracts expected loss from your starting balance.
The optional ranges use a simplified normal model and low, medium or high variance factors. The bust percentage is a rough heuristic, not a measured probability for your slot.
Keep it in perspective. Set a spending limit you can afford, and treat gambling as entertainment rather than income.