Betting ROI Calculator

What ROI and yield actually measure

Return on investment (ROI), sometimes called yield in a betting context, is simply your total profit divided by your total amount staked, expressed as a percentage. Staking €1,000 across a season and finishing €80 ahead is a 8% ROI — a useful, comparable figure regardless of whether that €1,000 came from 20 large bets or 200 small ones, which is exactly why it’s the standard way serious bettors track long-run performance rather than just watching their account balance.

ROI on its own doesn’t say much without context, though. An 8% ROI from ten bets could be one lucky long-shot winner; the same 8% ROI from a thousand bets, at consistent average odds, is a much stronger signal that something about your selection process has a genuine edge. The sample size behind an ROI figure matters as much as the figure itself.

Break-even win rate, explained

Every set of odds implies a minimum win rate you need just to break even — no profit, no loss. At decimal odds of 2.00 (even money), you need to win exactly 50% of the time to break even; at 3.00, you only need to win 33.3% of the time; at 1.50, you need to win 66.7% of the time. The formula is break-even win rate = 1 ÷ decimal odds, which is also exactly the bookmaker’s implied probability for that price. Comparing your actual win rate to this break-even figure at your own average odds is a far more useful gut-check than looking at win rate in isolation — a 55% win rate sounds strong, but it’s a loser at odds of 1.70 (57.6% break-even) and a solid winner at odds of 2.20 (45.5% break-even).

Why this calculator estimates average odds

Most bettors don’t keep a full per-bet log with the exact odds of every wager — they know their total staked, total returned, and how many bets they placed. This tool works backward from those totals: assuming flat, equal stakes across every bet, it derives the average winning odds that would be needed to turn your total stake into your total return, given how many of your bets won. It’s a genuinely useful estimate when staking was reasonably consistent, but it becomes less accurate the more your stake sizes varied bet to bet — a few unusually large stakes on long-shot odds can skew the "average" the calculator backs out well away from what a typical single bet actually looked like.

Tracking ROI over time, not just once

A single ROI snapshot is a starting point, not a conclusion. Bettors who take their long-run performance seriously typically recalculate ROI at regular intervals — say, every 100 or 200 bets — and watch whether it holds roughly steady, trends upward, or trends downward over time, rather than treating any one number as final. A steadily positive ROI across several such windows, at a consistent average odds level, is meaningfully stronger evidence of a real edge than the same headline ROI figure calculated once from a single large batch of results.

ROI across different types of bettor

What counts as a "good" ROI varies enormously depending on what kind of betting is being measured. A recreational bettor placing occasional long-shot bets might see wildly swinging ROI figures month to month purely from variance, even with no real edge either way. A value-focused bettor specializing in a narrow market, betting frequently at relatively low average odds, might consider a modest single-digit ROI over a large sample to be a strong, sustainable result — since a small edge, applied consistently across a high volume of bets, compounds meaningfully over time. There’s no universal "good ROI" number; it only means something in the context of bet volume, average odds, and how consistent the strategy behind it actually is.

FAQs