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What is Slot RTP? Find the Best Highest RTP Slots in 2021!

RTP in slots generally refers to the amount of money a player can expect to get back from a particular slot. In this guide, we’ll go through the slots with the highest RTP as well as the casinos with the highest slot payouts. Read on for more!

High RTP Slots for 2021

RankSlot NameRTPGame ProviderCasinos
King Billy Casino €1000 Welcome Bonus+200 Spins
BitStarz Casino 100% match up to 1 BTC
PlayOJO Casino 50 Free Spins on first deposit
1429 Uncharted Seas
Casumo Casino 100% up to €300 + 20 free spin
Rizk Casino Deposit €100, Play with €200 + 50 Free Spins
Mr Play Casino €200 Welcome Bonus & 100 Spins
Joker Strike
LeoVegas Casino Free Spins No Deposit Bonus
Casoo €2,000+200 Free Spins
SlotsMillion Casino Happy Hour Deposit Fridays
Caxino Casino 100% deposit bonus
Videoslots Casino 100% up to €200
PlayLuck £500 Welcome Bonus & 100 Spins
Cashimashi Casino 100% up to €200
Drift Casino €500 + 300 Free Spins
SlotsMillion Casino Happy Hour Deposit Fridays
PlayOJO Casino 50 Free Spins on first deposit
Casumo Casino 100% up to €300 + 20 free spin
SlotsMillion Casino Happy Hour Deposit Fridays
Good Girl Bad Girl
King Billy Casino €1000 Welcome Bonus+200 Spins
Videoslots Casino 100% up to €200
Mr Green Casino Double Deposit + 200 Free Spin
Zeus Lightning
97.73%Red Tiger Gaming
King Billy Casino €1000 Welcome Bonus+200 Spins
Cashimashi Casino 100% up to €200
LeoVegas Casino Free Spins No Deposit Bonus
White Rabbit
97.72%Big-Time Gaming
SlotsMillion Casino Happy Hour Deposit Fridays
King Billy Casino €1000 Welcome Bonus+200 Spins
Dunder Casino €100 + 100 Spins
Wolfpack Pays
SlotsMillion Casino Happy Hour Deposit Fridays
Mr Green Casino Double Deposit + 200 Free Spin
Videoslots Casino 100% up to €200

What is RTP?

RTP is a measure of how much money a game will return to a player in the long term. But what does that really mean when you sit down for a couple of spins on your favourite slot? How do you find the best RTP? We think we’ve found a comparison that’ll help make the concept more relatable.

Think of your weekly drive to the supermarket…

Think of your weekly shopping run, or any other car journey you might have. At any given moment during the drive towards the supermarket, your car will be going at a different speed; you might be at a standstill in traffic or cruising along happily. Over the duration of the whole journey though, you’ll have an average speed, which is made up of these slow and fast moments throughout the journey.

You can think of RTP as being exactly like that average speed. For any given spin while you’re playing, you might not get anything back or you could make a huge win. In the long run though, the average of all your spins will be the RTP.

The slots RTP value is calculated over hundreds of thousands or millions of spins. This means that just because you have a losing streak, it doesn’t mean the game is rigged or anything of the sort. The scale of spins the average is taken from is large enough to account for such instances. You might just as easily have a streak of wins!


Why Should You Care About RTP?

We believe that once informed, players are able to make better decisions when it comes to which games they’d like to play on.

RTP gives you a decent indication of the kind of game you’ll be pressing ‘spin’ on. It will give you an idea of the expected payout, meaning you can find the best payout slots online!

It’s also usually related to how volatile a particular title is, but we’ll get into all of that later. If you’d like to learn more about volatility, we recommend you check out our Guide to Volatility for a more in-depth look.


The Best High RTP Slots

If you’re just looking for a quick list of the highest RTP slots around, then look no further! This is a table of slots with the best RTP. Highest RTP slots are ranked further up. We’ll get into each of these titles just below.

Generally speaking, slots with an RTP higher than 97% will be considered high RTP. If you’re past 98%, then it’s one of the highest RTP slots!

Mega Joker – 99% RTP


Mega Joker

At a chart-topping 99% RTP, you’ll be hard pressed to find anything with a higher RTP. This is one of the highest RTP casino slot machines around. You’ll find a classic fruit machine theme here, with three main reels on the bottom half of the machine.

It has a basic and supermeter mode, as well as a local jackpot! The high RTP value only kicks in during the supermeter mode though, which is a little disappointing. Regardless, it’s an excellent and simple 3-reel, 5-payline game that’s sure to delight!

Check out our guide to the Best Jackpot Slots for more recommendations for jackpot slots!

2 – 1429 Uncharted Seas – 98.5% RTP1429 Uncharted Slots

Right on Mega Joker’s tail we find 1429 Uncharted Seas. This map-themed title has an impressively high RTP of 98.5%. It features 5 reels and 25 fixed paylines all over the map. It also features expanding wilds which will take up a whole reel. There’s also a free spins feature triggered by 3 bonus symbols. That means anchors away and open sails. Best of luck on those high seas!

3 – Joker Strike – 98.11% RTP

Joker Strike Slots

Despite its simplistic and unassuming appearance, this 5×3, classically-theme video slot offers a very healthy 98.11% RTP. It has 10 paylines and a max win of 1211× your stake. This is one of the best payout slots considering such a high RTP. You’ll find a couple of extra features to enjoy too! In fact, the Hi Roller feature is where you can actually take advantage of that 98.11% RTP. The base game only has a relatively standard 96.4% RTP.

4 – Blood Suckers – 98% RTP

Blood Sucker Slots

Continuing on our list covering some of the best payout slots, we have Blood Suckers. We’ll try to refrain from any stake-related jokes with this one. Blood Suckers is a 5-reel, 3-row video slot with 25 win lines. It’s quite simplistic and sparse when it come to features, but sometimes simple is good. This is especially true if ‘simple’ is accompanied with an alluring 98% RTP like it is in this game. Oh, and keep an eye out for those scatter symbols, the free spins section makes the game one to die for!

5 – Jokerizer – 98% RTP

Jokerizer SlotsAnother fruit themed slot!? We promise, it’s worth it! Jokerizer, by Yggdrasil, comes with a juicy 98% RTP. Just like the slot above, it has a 5-reel, 3-row layout, but this time with 5 paylines. The joker part of the Jokerizer name comes in with the bonus symbol for this title. Three Jokerizer symbols will net you a mystery win between 1000 and 6000! Have a spin yourself, our recommendation isn’t in jest!

6 – Starmania – 97.87% RTP

Starmania Slots

We move from fruit and jesters to… space dice? We’re not really sure how the dice fit into this one. Either way, you’ll find a 5-reel, 3-row and 10-payline set up with this one, which is standard fare for a video slot as you’ve probably gathered by this point. RTP sits at a very high 97.87%. So, roll the dice for the chance at a win that’s out of this world!

7 – Good Girl, Bad Girl – 97.8% RTP

Good Girl Bad Girl Slot

Quite an interesting setup with this one! Good Girl, Bad Girl offers players variable volatility gameplay. Using a mode selector located at the top of the 5 reels, you can choose between ‘good mode’, ‘bad mode’, or both modes. The first of these modes will offer low volatility, low risk gameplay. ‘Bad mode’ will offer high volatility, high risk gameplay. Playing with both modes activated will double up your bet, but also your paylines! You’ll go from 15 to 30 paylines, enabling a maximum RTP of 97.8%!

Check out our guide for Low Stakes and High Stakes slots if you’re more interested in either type of game, rather than both at once!

8 – Zeus Lightning: Power Reels – 97.73% RTP

An image of the Zeus Lightning: Power Reels slot game

Fancy a quick trip in time and space to ancient Greece, the realm of the mythological gods? Try to win Zeus' favour in this exciting slot from Red Tiger Gaming. Featuring reels with 6 symbols each, you’ll be playing on 30 winning paylines with an RTP of 97.73%! Take good care not to get zapped by Zeus' lightning bolt wilds as they expand across the reels. The god wasn’t known for his patience, and you’ll want to stick around to play this game!

9 – White Rabbit – 97.72% RTP

White Rabbit SlotsSadly, White Rabbit’s background music isn’t Jefferson Airplane’s 60s classic with the same name. Never mind that though! This game comes with Big Time Gaming’s special sauce: the Megaways™ mechanic! The flavour? 248,832 Megaways™ for a 97.72% RTP! How’s that for a great combo? Unlike Alice’s cake down the rabbit hole, this game doesn’t need a “Play Me” tag for you to give it a try!

10 – Wolfpack Pays – 97.5% RTP

Wolfpack SlotsWe weren’t aware wolves were so generous! You’ll get a free spin with every win on this game! Factor in the 97.5% RTP and you’ve got quite the recipe for fun on your hand, or, paws. The layout and design aren’t particularly inspiring, but we’re more than happy with the other features this game offers. There’s a Wolfpack feature that’s activated on your 4th Free Spin, which awards you free bonus games. Best of all, it doesn’t even have to be a full moon for you to try your hand at this slot!


RTP and Volatility

While RTP and volatility are somewhat related, one is not necessarily an indication of the other. You’ll generally find that higher RTP slots tend to be less volatile in nature. We’d like to stress that this isn’t a rule though. Like the slot we last covered – Wolfpack Pays, some high RTP slots are also high volatility.

Less volatile slots will also be more likely to hover around the given RTP value than high-volatility ones. This is because they’re, well, less volatile! This means they’ll deviate much less from the expected RTP, which is why they’re sometimes also called low variance.

We recommend you keep an eye out for both metrics when looking at slots to play. One of the best ways to do that is to check out our slot reviews. We always try to include as much information as possible, so have at it!


How to Pick a Slot Infographic


How is RTP Calculated?

This is one of the most important things to wrap your head around when learning about RTP. The RTP value is calculated over hundreds of thousands, or millions of spins. Slot developers will run the engine governing the whole game for hours upon hours, tabulating the results. They’ll then tweak the specifics as they deem necessary. This could be for a different RTP, volatility or any other metric they’d want to perfect.

In some cases, like with Big Time Gaming’s Megaways™ mechanic, the engine will be ready made and will already favour a certain style of game. This doesn’t mean it can’t be tweaked, though. Developers always have a high degree of control over the experience they might want to deliver to their players.

It's Good to Know! It's Good to Know!

The casinos themselves do not have any power over the game mechanics, which means they can’t rig slots against you. A bad streak doesn’t mean anything’s wrong, it’s just the nature of slots. The sample from which the average is calculated is large enough to take natural streaks like that into account.

House Edge and RTP

Keep in mind that RTP and House Edge values describe the same thing. If a game has an RTP of 96%, those missing 4% are the house edge. The same applies the other way round. A game with a 5% house edge for example, has an RTP of 95%.

“Theoretical” RTP

Some slots will describe the RTP value that they provide as “theoretical”. What does theoretical RTP mean? Is it not real? This goes alongside what we mentioned earlier about having bad streaks. The couple of spins you might play will not necessarily be representative of the given RTP, especially if a slot is highly volatile. You might have an unfortunate losing streak or else win big. On such a small scale, these would blow the RTP value out of the water.

Does that mean RTP is useless? Not really. The RTP value will still give you quite a bit of information about what to expect,  so it’s worth knowing. Slot providers are also legally obliged to provide it.

What About Low RTP?

It might be interesting to note that one of the more popular casino licenses now allows for slots to have an RTP as low as 85%. The Malta Gaming Authority argues that this will bring online slots closer to their land-based counterparts in terms of RTP. Land-based slot machines will often have a lower RTP since physical space is at a premium. This would mean each slot needs to provide more profit compared to online slots.

All of this makes those online casinos offering the best RTP even more special. The slots with the highest RTP will always be highly sought after.


Are There Any Disadvantages to High RTP Slots? What is the best RTP?

There are no real disadvantages to a slot with high RTP. The only potential downside is that high-RTP games might not necessarily deliver the features you’re after. A particularly high RTP slot might not deliver on free spins or bonus games that another game with a slightly lower RTP might. In this case, it just comes down to whether you’re ready to sacrifice certain features for the highest RTP possible.


Slots RTP Conclusion

So now onto the test section for this article. We’re just kidding, there’s no exam! We couldn’t really force you to sit for it even if there were one! We do hope you’re at least a little more informed about this common online casino term. We hope this article will help you feel more confident when making you next slot choice, and more satisfied once you do choose.

Top10-CasinoSites has lots of other informative articles about other common gaming terms. Check out our various guides, such as our Volatility Explainer Article. We’re sure it’s worth the read!



❓ Where can I play high RTP slots?

We recommend King Billy and LeoVegas for high RTP slots. Check out the full guide for more recommendations!

❓ What is a high RTP slot?

High RTP slots are generally games with an RTP above 97%. RTP is the amount of money you can expect to make back from the sum of your bets in the long term.

❓ How are RTP and volatility related?

Generally speaking, high-RTP games are less volatile. This isn’t a necessary rule, though! We recommend finding out both ratings for a particular slot.

❓ How do you measure RTP?

RTP is difficult to measure on your own, as it is an average value calculated by developers over hundreds of thousands of spins. It describes the average percentage of money won back from the amount spent on bets.

❓ Are high RTP slots always the best?

It’s always a nice feature when a slot has a high RTP. Sometimes, though, a high-RTP slot might not have the exact other features you’re looking for. So depending on what you’d like to play, they might not always be the best.



We collaborate with industry experts to make sure that our readers are getting the best possible content. All our articles are there to improve your casino experience.

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