RTP & Expected-Value Calculator

RTP — return to player — is the percentage a game is built to pay back over the long run. A 96% RTP slot returns €96 for every €100 staked on average, across millions of spins. That last part is where most people go wrong, so this calculator translates the percentage into something you can actually feel: your expected return on a real stake, your expected loss, and the realistic spread for a single session of the length you'll actually play.

The number that matters for one evening isn't the headline RTP — it's the variance around it. This tool shows both, so you can see why a 96% game can still leave you well up or well down by the time you log off.

Expected return is your total stake multiplied by the RTP — the long-run average paid back. Expected loss is the rest, the slice the house edge keeps, equal to your total stake times one minus the RTP. Neither is what you'll see in one session, which is what the realistic range is for: it shows a good run, a middle run and a bad run, and the gap between them widens with the game's volatility. A high-volatility game has the same average as a low-volatility one at equal RTP, but a far wider range — bigger spikes, deeper troughs. Read the range, not just the average, and you'll have honest expectations going in.

RTP, house edge and total turnover

RTP and house edge are two views of the same coin: a 96% RTP means a 4% house edge. The edge applies to every euro staked — your total turnover — not to your deposit. This is the most common confusion, so it's worth labouring. If you deposit €50 and spin it through the game many times, your total stake might be €500 or more, and the expected loss is 4% of that turnover, not of your €50 deposit.

That's why a small deposit played for a long session can lose more than the deposit itself looks like it should — the money recycles through the edge again and again. The calculator works in total stake (spins × bet) for exactly this reason, giving you the figure that genuinely predicts your expected loss rather than a flattering one based on the deposit alone.

Why volatility changes everything short-term

Two games can share a 96% RTP yet feel completely different. A low-volatility slot pays small and often, so a session hugs the average — modest, steady, predictable. A high-volatility slot pays rarely but large, so most sessions run below average while you wait for a hit that may or may not come, then occasionally spikes well above it. The long-run RTP is identical; the short-run experience is night and day.

This is why RTP alone is a poor guide to one evening's play. The calculator's realistic range captures the difference: feed in a volatile game and the good-run and bad-run outcomes pull far apart, even with the average unchanged. If you prefer a longer, calmer session from a fixed budget, lower volatility serves you better; if you're chasing the occasional big hit and accept more dry spins, higher volatility fits — just go in knowing the trade-off.

Worked example: €1 spins for 300 rounds

You plan 300 spins at €1 each on a 96% RTP slot. Total stake is 300 × €1 = €300 — that's your turnover, and the figure that drives the maths. Expected return is €300 × 96% = €288; expected loss is the remaining €12, which is simply 4% of €300.

So on average you'd hand over €300 in bets and get €288 back — about €12 gone. But average is the one outcome you almost never see exactly. On a medium-volatility game the simulation shows a middle outcome near −€12 as expected, a good run finishing perhaps €40–€60 ahead, and a bad run down €120 or more. Swap in a 94% RTP game and rerun it: expected loss doubles to around €24, and every figure shifts against you. Two percentage points of RTP doesn't sound like much until you watch it double your expected loss in plain euro.

Glossary

RTP

Return to player — the percentage of total stakes a game is designed to pay back over the long run, e.g. 96% means €96 returned per €100 staked on average.

House edge

The casino's built-in advantage, equal to 100% minus the RTP; it's the average share of every euro staked that the operator keeps over time.

Volatility

How a game pays out — low volatility means small, frequent wins, while high volatility means rare but larger wins and wider swings.

Wagering requirement

The total turnover you must bet before bonus funds and their winnings become withdrawable, written as a multiple such as 35x.

Expected value (EV)

The average outcome of a bet or bonus across many simulated attempts, expressed in euro — positive means good value, negative means an expected loss.