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It tells you how much profit you make per dollar wagered.\n\n## Calculating ROI\n\n**ROI = (Profit \u002F Total Staked) × 100%**\n\n### Example\n- Total wagered: \\$10,000\n- Total returned: \\$10,500\n- Profit: \\$500\n\n**ROI = (\\$500 \u002F \\$10,000) × 100% = 5%**\n\nUse our [ROI Calculator](\u002Fbetting\u002Fprofit-graph) for instant results.\n\n## What's a Good ROI?\n\n| ROI | Level | Reality |\n|-----|-------|---------|\n| > 10% | Elite | Top 1% of bettors |\n| 5-10% | Excellent | Professional level |\n| 2-5% | Good | Sustainable profit |\n| 0-2% | Break-even | Covering costs |\n| \u003C 0% | Losing | Need to improve |\n\n**Important:** Even 3% ROI is excellent over thousands of bets.\n\n## Sample Size Matters\n\nROI is meaningless without enough bets:\n\n| Bets | Reliability |\n|------|-------------|\n| 50 | Very low (high variance) |\n| 100 | Low |\n| 500 | Moderate |\n| 1000+ | High |\n\n### Variance Example\nWith true 3% ROI and 100 bets:\n- 5% chance of -10% result\n- 5% chance of +16% result\n\nAt 1000 bets, range narrows significantly.\n\n## ROI vs Yield\n\nOften used interchangeably, but technically:\n- **ROI**: Profit \u002F Capital deployed\n- **Yield**: Profit \u002F Total turnover (same formula)\n\nIn betting, they mean the same thing.\n\n## Tracking Your ROI\n\nUse our [Bet Tracker](\u002Fbetting\u002Fbet-tracker) to record:\n- Every bet placed\n- Stakes and odds\n- Results\n- Running ROI\n\n### What to Track\n\n| Field | Why |\n|-------|-----|\n| Sport | Which sports are you best at? |\n| Market | 1X2 vs handicap vs totals |\n| Odds range | High vs low odds performance |\n| Bookmaker | Which offers best value? |\n\n## ROI by Betting Type\n\n### Pre-match vs Live\nMany bettors perform differently in [live betting](\u002Fglossary\u002Fbetting\u002Flive-betting) vs pre-match.\n\n### Singles vs Accumulators\n[Accumulators](\u002Fglossary\u002Fbetting\u002Faccumulator) often have lower ROI due to compounded [margin](\u002Fglossary\u002Fbetting\u002Fmargin).\n\n### Favorites vs Underdogs\nPublic money on favorites can create [value](\u002Fglossary\u002Fbetting\u002Fvalue-bet) on underdogs.\n\n## Improving Your ROI\n\n1. **Specialize**, Focus on leagues\u002Fsports you know best\n2. **Line shop**, Compare odds across bookmakers\n3. **Track data**, Identify your strengths and weaknesses\n4. **Cut losers**, Stop betting on consistently unprofitable areas\n5. **Use tools**, [Margin calculator](\u002Fbetting\u002Fmargin-calculator), [EV calculator](\u002Fbetting\u002Fvalue-bet-calculator)\n\n## Common Mistakes\n\n### Cherry-picking periods\n\"I was +20% last month\", but -5% over 6 months.\n\n### Ignoring variance\nShort-term results are noise. 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