What is a Good Betting ROI?
ROI (Return on Investment) is the most important measure of betting profitability. Here is what the data says.
Average ROI
Based on real data from Gammbler tracking 1,888 bets, the average bettor ROI is +10.2%. This aligns with the well-known fact that most bettors lose money due to the sportsbook's built-in edge (the vig/juice).
What is Betting ROI?
ROI measures your net profit relative to the total amount you wagered. The formula is simple:
ROI = (Net Profit / Total Amount Wagered) x 100
For example, if you wagered $10,000 total and ended with $10,500, your ROI is +5%. If you ended with $9,700, your ROI is -3%.
ROI Benchmarks
- Below -5%: Poor. Losing money consistently. Most casual bettors fall here.
- -5% to 0%: Below average. Losing less than most, but still unprofitable.
- 0% to +3%: Breakeven to slightly profitable. Better than most bettors.
- +3% to +7%: Good. Consistently profitable. Would rank well on Gammbler.
- +7% to +15%: Excellent. Among the best tracked bettors.
- +15%+: Elite. Rare — only a small percentage sustain this level.
ROI by Sport
Based on Gammbler data:
- NFL: Average ROI of +10.4%
- NBA: Average ROI of +9.8%
- MLB: Average ROI of +10.6%
- SOCCER: Average ROI of +10.5%
- NHL: Average ROI of +8.9%
- CFB: Average ROI of +6.5%
- CBB: Average ROI of +7.3%
Why ROI Matters More Than Win Rate
A bettor with a 45% win rate betting underdogs at +200 can be far more profitable than a bettor with a 58% win rate betting heavy favorites at -300. Win rate tells you how often you win. ROI tells you whether you actually make money. This is why serious bettors and the Gammbler scoring algorithm prioritize ROI over raw win rate.
Frequently Asked Questions
What ROI do professional bettors achieve?
Professional sports bettors typically achieve 3-10% ROI over large sample sizes (1,000+ bets). Very few sustain above 10% long-term.
Is a negative ROI normal?
Yes. The majority of sports bettors have a negative ROI. The sportsbook's vig guarantees that the average bettor will lose money over time.
How many bets do I need for a reliable ROI?
At least 200-500 bets at similar odds to have a statistically meaningful ROI. Fewer bets means your ROI is dominated by variance, not skill.