ROI (Return on Investment)
Your net profit divided by total amount wagered, expressed as a percentage.
ROI measures the overall profitability of your betting. A positive ROI means you're profitable; negative means you're losing money. In sports betting, an ROI of 3-5% is considered strong over a large sample.
ROI is the most honest measure of betting performance because it accounts for the volume of bets. Winning $500 sounds impressive, but if you wagered $50,000 to do it, your ROI is only 1%.
Be cautious about ROI calculated over small samples. You need hundreds of bets minimum before ROI becomes statistically meaningful. Over 20 bets, even a 30% ROI could easily be due to luck.
Formula
ROI = (Net Profit / Total Amount Wagered) × 100Example
You wagered $10,000 total and have $10,300 in returns. Net profit = $300. ROI = 300 / 10,000 = 3%.
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