In this guide
Quick answer
- Book of 99 and Mega Joker top the list at around 99% RTP.
- A 99% RTP slot returns about $99 per $100 staked, on average, over the long run.
- Some casinos run lower-RTP versions of the same game. Always check the info screen.
Return to player, or RTP, is the share of all money wagered on a slot that it pays back as wins. A slot with 96% RTP pays back $96 for every $100 staked, measured across millions of spins. In a single evening, your result can swing far from that number.
What RTP actually means
RTP is calculated by the game provider and verified by independent testing labs. It is a long-run average. Most online slots sit between 94% and 97%, so anything above 97.5% is genuinely good.
The flip side of RTP is the house edge. A 97% RTP slot has a 3% house edge, and that is the figure that decides how fast your balance shrinks. Our house edge guide explains it in more depth.
The top 6 by RTP
| Slot | Provider | RTP | Volatility |
|---|---|---|---|
| Book of 99 | Relax Gaming | 99.00% | high |
| Mega Joker | NetEnt | up to 99.00% | high |
| Blood Suckers | NetEnt | 98.00% | low |
| Jokerizer | Yggdrasil | 98.00% | medium |
| Starmania | NextGen | 97.87% | medium |
| White Rabbit Megaways | Big Time Gaming | 97.72% | high |
Book of 99
Relax Gaming’s take on the classic “Book of” format. The 99% RTP is unusual for a modern release. Expect long dry spells, because volatility is high.
Mega Joker
A classic fruit machine with a Supermeter mode. The headline 99% RTP only applies when you play the Supermeter optimally, so the base game returns less.
RTP vs volatility
RTP tells you how much a slot pays back. Volatility tells you how it pays: many small wins (low) or rare big ones (high). Blood Suckers pays often and small. White Rabbit can go hundreds of spins without a feature, then pay out a large multiple of your stake. Read more in RTP vs volatility.
Expected loss calculator
Plug in your own numbers to see the average cost of a session.
Average expected loss:
This is a long-run average. Any single session can end well above or below it.Where to play them
Availability depends on your state. Players in states with legal online casinos (such as New Jersey, Pennsylvania and Michigan) can find many of these games at licensed sites. Check the RTP shown in the game before you play.
FAQ
Does a higher RTP mean I will win?
No. RTP is an average over millions of spins. It lowers your expected loss, but every session is still random.
Can a casino change a slot's RTP?
Casinos choose from preset RTP versions supplied by the provider. They cannot adjust it mid-session. The active version is shown in the game's info screen.
What is a good RTP for online slots?
Around 96% is typical. Anything above 97.5% is excellent.