Method
Odds guides
Method explainers: how each odds format converts to implied probability, how the vig is removed, and how to read a price move. Every guide shows its arithmetic.
Standing
Last ReviewedEditorial review 2026-08-01
Method
Reference
The conversion ladder
Every value below is computed on this page from the odds in the first column — no feed, no transcription. Pair a favourite row with its underdog counterpart and the two probabilities sum to more than 100%; that excess is the market's hold.
| American | Decimal | Implied probability | Payout on 100 |
|---|---|---|---|
| -400 | 1.250 | 80.0% | $125.00 |
| -250 | 1.400 | 71.4% | $140.00 |
| -200 | 1.500 | 66.7% | $150.00 |
| -145 | 1.690 | 59.2% | $168.97 |
| -120 | 1.833 | 54.5% | $183.33 |
| -110 | 1.909 | 52.4% | $190.91 |
| +100 | 2.000 | 50.0% | $200.00 |
| +110 | 2.100 | 47.6% | $210.00 |
| +120 | 2.200 | 45.5% | $220.00 |
| +145 | 2.450 | 40.8% | $245.00 |
| +200 | 3.000 | 33.3% | $300.00 |
| +250 | 3.500 | 28.6% | $350.00 |
| +400 | 5.000 | 20.0% | $500.00 |
- How to read American oddsWhat the plus and minus actually mean, and how to move between American, decimal, and fractional notation.
- Implied probability and the marginWhy the probabilities in a posted market add up to more than 100%, and what to do about it.
- How to compare prices across venuesMaking a like-for-like comparison between two sportsbooks, or between a sportsbook and an exchange.
- How to read line movementSeparating information, flow, and risk management when a price changes — and what movement cannot tell you.
- Expected value and edgeHow expected value is computed, and why the probability estimate matters far more than the arithmetic.