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RTP Calculator: Work Out a Slot’s Theoretical Return

By Matthew Kennedy | Updated 17 July 2026

Use this free calculator to see what a slot really returns over the long run. Enter a game’s RTP (Return to Player), your stake per spin and how many spins you plan to play, and it works out the theoretical return, the average amount the game keeps, and the house edge.

RTP calculator

Enter a game's RTP and how you play to see the theoretical, long-run return and what the game keeps on average. These are not a prediction of any single session.

Game RTP

96.0%

UK slots typically sit around 95-96%.

Stake per spin (£) Your bet on each spin.

Number of spins Roughly 300-500 spins is about an hour of play.

Total you'll stake Stake per spin × number of spins.

Theoretical return

Paid back over the long run

Average cost to play

What the game keeps (house edge)

House edge

100% − RTP

Before you trust the numbers: these are long-run averages across hundreds of thousands of spins, not what will happen in your session. Real play swings hard both ways - you can lose your whole stake or hit a big win in a short burst. How often a game pays is its volatility, not its RTP.

18+ - Slots are games of chance; outcomes can't be predicted or guaranteed. Please gamble responsibly - GambleAware.org

⚠️RTP is not your chance of winning

A high RTP means a game returns more of all money staked over the long term – it does not tell you whether you will win in any single session. How often a slot pays is its volatility, not its RTP, and no result is ever guaranteed.

How the calculation works

RTP is the percentage of total stakes a slot is designed to pay back across hundreds of thousands of spins. Stake £500 on a 96% RTP slot and the theoretical return is £480, with the game keeping £20 on average over the long run – that is the house edge. Real sessions vary widely around that average, in both directions.

Does a higher RTP mean I will win?

No. A higher RTP means a slot returns more of the total amount staked over the long run, but it is not a measure of your chance of winning a session. You can still lose on a high-RTP slot, and a win is never guaranteed.

How is a slot’s RTP calculated?

RTP is the total amount a game returns divided by the total amount staked, measured over a very large number of spins – often hundreds of thousands or millions. It is a long-run theoretical figure, not a per-session one.

How many spins is RTP based on?

RTP is a theoretical average over an extremely large number of spins, far more than anyone plays in a single session. Over a short session your actual return can be much higher or much lower than the stated RTP.

What is the house edge?

The house edge is 100% minus the RTP. On a 96% RTP slot the house edge is 4%, meaning the game keeps about £4 of every £100 staked on average over the long run.

Want the full picture? Read our complete guide to RTP in slots.

18+ – Gambling is a game of chance and results cannot be predicted or guaranteed. Please gamble responsibly – GambleAware.org.

Matthew Kennedy

Matthew Kennedy co-founded SlotFruit.co.uk in 2008 alongside Becky Mosley and has worked in the UK online gambling industry ever since. He runs the technical side of the operation, building and maintaining the platforms that power SlotFruit and the wider Take Marketing portfolio.

Matt’s role is hands-on. He writes the code behind the offer feeds, the comparison tools readers use, and the back-office systems that keep every casino listing accurate and current. If you have used a feature on this site, the chances are he built it. He is also responsible for site performance, mobile usability, and the technical SEO that lets a small independent comparison site compete with much larger publishers.

Over 17 years in the industry, Matt has worked directly with affiliate platforms, casino operators, and software providers. He has seen the market move from desktop Flash slots to mobile-first HTML5, lived through every iteration of UK Gambling Commission rules, and built the systems that keep SlotFruit’s coverage compliant as regulation evolves. He has a particular interest in responsible gambling tooling and player-fund safety, the parts of the industry most people do not see but that matter most.

Matt is a Companies House registered director (Take Marketing Limited, company no. 07619813) and is based in Lincolnshire, England.

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