A sports betting arbitrage and middle opportunity calculator for prop bets.
Live: bensteffler.github.io/edgelock
EdgeLock helps you analyze betting opportunities where you can bet on both sides of a prop (e.g., Over 1.5 assists and Under 2.5 assists) to either:
- Lock in guaranteed profit (true arbitrage)
- Find middle opportunities where both bets can win
- Scenario Detection: Automatically identifies true arbitrage, middle opportunities, gap risks, and negative EV situations
- Optimal Stake Calculator: Shows how to distribute your bankroll for equal returns
- Bet Rating System: 0-100 score based on safety, middle size, and upside
- Real-time Calculations: Updates instantly as you type
| Component | Max | Description |
|---|---|---|
| Safety | 35 | Worst-case ROI (positive = high score) |
| Middle | 30 | Number of outcomes where both bets win |
| Upside | 35 | Best-case ROI potential |
Scoring differences:
- Arbitrage: Linear scaling for upside (finding 10% guaranteed profit is exceptional)
- Middle: Square root scaling (hitting middle naturally gives ~100% ROI)
| Type | Description | Example |
|---|---|---|
| True Arbitrage | Adjacent ranges, guaranteed profit | Over 2.5 @ 2.3 + Under 2.5 @ 2.1 |
| Middle Opportunity | Overlapping ranges, both can win | Over 1.5 @ 2.1 + Under 2.5 @ 2.1 |
| Gap Risk | Non-adjacent ranges, both can lose | Over 2.5 @ 2.0 + Under 1.5 @ 2.0 |
| Negative EV | Combined implied prob > 100% | Over 2.5 @ 1.85 + Under 2.5 @ 1.95 |
- Toggle between Decimal and American odds format
- Enter bet type (Over/Under), line, and odds for both bets
- Enter your total stake
- View the rating, scenario type, and optimal stake distribution
Click the toggle to switch between:
- Decimal odds (e.g., 2.10, 1.95)
- American odds (e.g., +110, -110)
Existing values automatically convert when you toggle.
Just open index.html in a browser. No build step required.
CC BY-NC 4.0 - Free to use and modify for non-commercial purposes.