Master the three odds formats and calculate payouts instantly
American odds are the standard format used by US sportsbooks. They're displayed as positive or negative numbers.
Meaning: The favorite. The number shows how much you must bet to win $100.
Formula:
Payout = Stake × (100 / |odds|)
Meaning: The underdog. The number shows how much you win on a $100 bet.
Formula:
Payout = Stake × (odds / 100)
Decimal odds are popular in Europe, Australia, and Canada. They show the total return per $1 wagered (including your stake).
Total Return = Stake × Decimal Odds
Decimal odds make parlay calculations simple - just multiply all the odds together. Example: 1.91 × 2.50 × 1.50 = 7.16 (a $100 bet returns $716).
Implied Probability = 1 / Decimal Odds × 100
Example: Odds of 2.00 → 1/2.00 = 0.50 = 50% implied probability
Fractional odds are the traditional UK format, commonly used in horse racing. They show profit relative to stake.
Written as A/B (e.g., 5/2), this means: "For every B dollars wagered, you profit A dollars."
| Fractional | American | Decimal | $100 Profit |
|---|---|---|---|
| 1/5 | -500 | 1.20 | $20 |
| 1/2 | -200 | 1.50 | $50 |
| 10/11 | -110 | 1.91 | $91 |
| 1/1 (evens) | +100 | 2.00 | $100 |
| 6/5 | +120 | 2.20 | $120 |
| 3/2 | +150 | 2.50 | $150 |
| 2/1 | +200 | 3.00 | $200 |
| 5/1 | +500 | 6.00 | $500 |
Every odds format can be converted to an implied probability - the likelihood the sportsbook is pricing in for that outcome.
When you add up the implied probabilities of all outcomes, they'll exceed 100%. This excess is the sportsbook's profit margin.
| Format | Formula |
|---|---|
| American (+) | 100 / (odds + 100) × 100 |
| American (-) | |odds| / (|odds| + 100) × 100 |
| Decimal | 1 / odds × 100 |
| Fractional | B / (A + B) × 100 |
Use our full odds converter tool for instant conversions between all formats.
Open Odds Converter| American | Decimal | Prob |
|---|---|---|
| -500 | 1.20 | 83.3% |
| -200 | 1.50 | 66.7% |
| -150 | 1.67 | 60.0% |
| -110 | 1.91 | 52.4% |
| +100 | 2.00 | 50.0% |
| +150 | 2.50 | 40.0% |
| +200 | 3.00 | 33.3% |
| +300 | 4.00 | 25.0% |
| +500 | 6.00 | 16.7% |