What is ROI?
Total profit divided by total stake, the cleanest single number for a sports bettor's performance.
Also known as: return on investment
ROI separates good bettors from lucky ones over a long enough sample. A 5% ROI on thousands of bets across calibrated edges is excellent; a 30% ROI on twelve bets is noise. Always pair ROI with sample size and stake distribution — flat-staking with a 5% ROI is a much harder achievement than a percentage-staking ROI of the same headline number.
Example
$10,000 staked across 1,200 bets returns $720 in profit. ROI = 720 / 10,000 = 7.2%.
Related terms
Expected value (EV) is the average profit or loss a bet pays per dollar staked if you repeated it under the same odds and probability forever.
The percentage of decided bets that won — excluding pushes.
The dedicated pool of money a bettor uses to place wagers, kept separate from living expenses.
See roi applied to a real slate
NotaSportsGuru runs the math behind every published leg — Parlay of the Day, player props, match lines — with the model’s expected value and edge on every line.