ROI Calculator

Measure the return on investment across a set of bets from your total staked and total returned.

An ROI calculator measures profit as a percentage of the money you staked, showing whether your betting has produced an edge over a run of wagers.

What Is Return on Investment?

Return on investment is profit expressed as a percentage of the total amount you risked. This single number is the most honest way to judge a betting record because it accounts for scale: the same profit means something different depending on how much you staked. ROI ties your profit to the risk you took to achieve it. The formula is simple — profit divided by total staked, times 100 to express as a percentage — but the insight it provides is powerful. A win-loss record tells you nothing about edge; a 10% ROI over a real sample tells you that you have found an edge and it has held up. ROI is how professional punters and betting syndicates evaluate their performance. A casual bettor might celebrate a big win; a sharp bettor checks the ROI. This distinction in mindset separates sustainable, long-term profit from the illusion of success that volatility creates.

How ROI Is Calculated

ROI distils a betting record into three numbers. Start with total staked: the sum of every stake you placed across all bets, regardless of outcome. Add up every winning bet, every losing bet, every void and every pending bet — all the money you put at risk. Then calculate total returned: every pound you got back, whether from a winning bet or a losing one. A losing bet has zero returned; a winning bet returns the stake plus the profit; a void bet returns the full stake with no profit. Subtract total staked from total returned to get profit — this is your net gain or loss in euros. Finally, divide profit by total staked and multiply by 100 to get ROI as a percentage. This percentage is directly comparable across different seasons, different bet types or different time periods, because it automatically adjusts for the scale of play. The beauty of ROI is that it answers a simple question: for every euro you staked over this sample, how many cents of profit did you generate? A 10% ROI means 10 cents of profit per euro wagered. A 0% ROI means you are breaking even. A negative ROI means you are losing money.

What the Calculator Shows You

Enter your total amount staked in euros across all your bets, then your total amount returned. The calculator immediately outputs your profit, which is the difference — total returned minus total staked. ROI as a percentage shows you how much profit you generated for each euro wagered. This is your headline performance metric, the single figure that bookmakers and bettors use to evaluate an edge. The ROI percentage isolates your actual profitability from the absolute size of your record, making it comparable across different betting volumes and time periods. A 10% ROI on €2,400 staked means the same thing as a 10% ROI on €24,000 staked: for every euro at risk, you generated ten cents of profit. The calculator also helps you understand the scale of your sample: if you have staked a large amount but the ROI is only a small percentage, you can identify whether your profitability comes from a consistent edge across many bets or from a small number of high-odds winners that have skewed your record. Context matters enormously for interpreting what your ROI actually means.

Worked Example

Consider a season of 120 bets. Your average stake is €20, so your total staked is €2400. Across the season, your total returned — from all wins, losses, voids and pushes combined — is €2640. The profit is €2640 − €2400 = €240. Your ROI is €240 divided by €2400, times 100, which is 10.0%. The data sheet notes that a 10% ROI over 120 bets is a strong result; most winning bettors operate in low single figures. This means that for every euro staked, you generated 10 cents of profit. This record demonstrates a real edge: you risked €2400 and the market paid you back €2640, netting a measurable profit. Understanding this ratio is crucial: it separates lucky runs from genuine skill, because ROI automatically scales for risk and sample size.

ROI on EUR 2,400 Staked, by Total Returned

Different levels of return produce different ROI outcomes on the same stake base. The table below shows what various total returns mean when measured against €2400 staked.

A total returned of €2160 means you lost €240 and posted a −10.0% ROI. A return of €2400 breaks you even with 0% ROI. A return of €2640 produces the 10% ROI shown in the worked example. A return of €3000 means €600 profit for a 25.0% ROI. Notice how the ROI scales linearly with profit when the stake base stays the same. The relationships here hold for any stake base — scale the stake up or down, and the ROI percentages remain true if the return scales proportionally.

What Different ROI Levels Mean Over a Decent Sample

ROI becomes meaningful only when you have placed enough bets for randomness to wash out. The same ROI level can mean different things depending on context.

Negative ROI means the bookmaker’s margin has beaten you; positive ROI means you have beaten the bookmaker over the run. The interpretation depends on sample size. A 1–3% ROI built over a large sample is evidence of a genuine edge. The same 1–3% ROI over a small sample is almost certainly noise — random variance can easily produce that. Similarly, anything above 15% over a small sample is usually a warning sign: either you have gotten very lucky, or you have discovered a soft market that will close as soon as sharps notice it.

Sample Size, Stakes and What ROI Measures

ROI only becomes meaningful over a decent sample of bets — over very few bets it is mostly noise, while over many bets it starts to describe something real. Stake sizing also matters enormously. Flat stakes — the same stake every bet — give you a clean read of ROI. Variable stakes, where you bet bigger on your strongest convictions, can flatter or disguise your record. A record built with flat stakes is not directly comparable to one built with variable stakes, because the variance and edge measurement are different. Another critical point: ROI is measured against turnover, not bankroll. A 10% ROI does not mean a 10% return on the money sitting in your betting account. If you staked much more than the amount held in your account, your return was 10% of the money turned over, not 10% of the account balance. This distinction matters for bankroll management because it affects how you size bets relative to the funds available.

When ROI Makes Sense

ROI shines as a tracking tool once you have established a betting record and want to measure whether you are improving over time. It is an honest metric that refuses to hide bad decisions behind lucky winners. ROI works best alongside other measures: strike rate tells you how often you win regardless of odds, and CLV tells you whether you beat the bookmaker’s closing line. Together, these three metrics paint a complete picture. As a tool for decision-making, ROI is most useful after the fact. You cannot use it to predict whether a single bet is worth placing; you use it to evaluate whether your bet-selection process is working. This turns ROI into a feedback loop: place bets, calculate ROI, refine your process, place the next batch. Bankroll management requires different thinking than ROI — you need to size bets according to your edge and variance, not just chase a target ROI.

Common Mistakes

Many bettors calculate ROI against their account bankroll instead of total stakes, dramatically overstating their edge. Others read a strong ROI over a handful of bets as proof of a genuine edge, when in fact they have just gotten lucky. A frequent error is counting only settled winners in the total returned, quietly ignoring void or pending bets, which biases the record upward. Finally, bettors sometimes compare an ROI built on flat stakes with one built on variable stakes, not realizing that different staking schemes produce different ROI figures even when the actual edge is identical.

ROI vs Strike Rate vs CLV

ROI captures profit as a percentage of stakes, but other metrics tell you different parts of the story.

ROI is outcome-focused: it measures the profit you actually made. Strike rate is volume-focused: it tells you the percentage of bets you won, but high strike rates at short odds can produce lower ROI than lower strike rates at longer odds. CLV — closing line value — measures whether your selections beat the odds the market offered at close, which is a faster signal of edge than ROI because it does not require you to wait for all the outcomes to settle. All three are worth tracking, because together they reveal whether your profit comes from genuine skill or from variance.