Betting Odds Converter Calculator
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Odds and Probabilities for different Odds Formats
| DECIMAL ODDS | FRACTIONAL ODDS | AMERICAN ODDS | PROBABILITY % |
| 1 | 0/∞ | -∞ | 100% |
| 1.01 | 1/100 | -10000 | 99.01% |
| 1.02 | Jan-50 | -5000 | 98.04% |
| 1.03 | Jan-33 | -3333 | 97.09% |
| 1.04 | 25-Jan | -2500 | 96.15% |
| 1.05 | 20-Jan | -2000 | 95.24% |
| 1.06 | 16-Jan | -1667 | 94.34% |
| 1.07 | 14-Jan | -1429 | 93.46% |
| 1.08 | 13-Jan | -1250 | 92.59% |
| 1.09 | 11-Jan | -1111 | 91.74% |
| 1.1 | 10-Jan | -1000 | 90.91% |
| 1.11 | 9-Jan | -909 | 90.09% |
| 1.12 | 17-Feb | -833 | 89.29% |
| 1.13 | 15-Feb | -769 | 88.50% |
| 1.14 | 7-Jan | -714 | 87.72% |
| 1.15 | 13-Feb | -667 | 86.96% |
| 1.16 | 13-Feb | -625 | 86.21% |
| 1.17 | 6-Jan | -588 | 85.47% |
| 1.18 | 11-Feb | -556 | 84.75% |
| 1.19 | 11-Feb | -526 | 84.03% |
| 1.2 | 5-Jan | -500 | 83.33% |
| 1.22 | 9-Feb | -455 | 81.97% |
| 1.25 | 4-Jan | -400 | 80% |
| 1.28 | 7-Feb | -357 | 78.13% |
| 1.3 | 10-Mar | -333 | 76.92% |
| 1.33 | 3-Jan | -303 | 75.19% |
| 1.35 | 20-Jul | -286 | 74.07% |
| 1.36 | 11-Apr | -278 | 73.53% |
| 1.4 | 5-Feb | -250 | 71.43% |
| 1.44 | 9-Apr | -227 | 69.44% |
| 1.45 | 20-Sep | -222 | 68.97% |
| 1.47 | 17-Aug | -213 | 68.03% |
| 1.5 | 2-Jan | -200 | 66.67% |
| 1.53 | 15-Aug | -189 | 65.36% |
| 1.57 | 7-Apr | -175 | 63.69% |
| 1.6 | 5-Mar | -167 | 62.50% |
| 1.62 | 13-Aug | -161 | 61.73% |
| 1.63 | 8-May | -159 | 61.35% |
| 1.66 | 3-Feb | -152 | 60.24% |
| 1.7 | 10-Jul | -143 | 58.82% |
| 1.72 | 11-Aug | -139 | 58.14% |
| 1.8 | 5-Apr | -125 | 55.56% |
| 1.83 | 6-May | -120 | 54.54% |
| 1.9 | 10-Sep | -111 | 52.63% |
| 1.91 | 11-Oct | -110 | 52.36% |
| 1.95 | 20/21 | -105 | 51.28% |
| 2 | 1-Jan | +/-100 | 50% |
| 2.05 | 21/20 | 105 | 48.78% |
| 2.1 | 10-Nov | 110 | 47.62% |
| 2.2 | 5-Jun | 120 | 45.45% |
| 2.25 | 4-May | 125 | 44.44% |
| 2.3 | 13/10 | 130 | 43.48% |
| 2.38 | 8-Nov | 138 | 42.02% |
| 2.4 | 5-Jul | 140 | 41.67% |
| 2.5 | 2-Mar | 150 | 40% |
| 2.6 | 5-Aug | 160 | 38.46% |
| 2.63 | 13/8 | 163 | 38.02% |
| 2.7 | 17/10 | 170 | 37.04% |
| 2.75 | 4-Jul | 175 | 36.36% |
| 2.8 | 5-Sep | 180 | 35.71% |
| 2.88 | 15/8 | 188 | 34.72% |
| 2.9 | 19/10 | 190 | 34.48% |
| 3 | 1-Feb | 200 | 33.33% |
| 3.1 | 21/10 | 210 | 32.26% |
| 3.13 | 17/8 | 213 | 31.95% |
| 3.2 | 5-Nov | 220 | 31.25% |
| 3.25 | 4-Sep | 225 | 30.77% |
| 3.3 | 23/10 | 230 | 30.30% |
| 3.38 | 19/8 | 238 | 29.59% |
| 3.4 | 5-Dec | 240 | 29.41% |
| 3.5 | 2-May | 250 | 28.57% |
| 3.6 | 13/5 | 260 | 27.78% |
| 3.75 | 4-Nov | 275 | 26.67% |
| 3.8 | 14/5 | 280 | 26.32% |
| 4 | 1-Mar | 300 | 25% |
| 4.2 | 16/5 | 320 | 23.81% |
| 4.33 | 3-Oct | 333 | 23.09% |
| 4.5 | 2-Jul | 350 | 22.22% |
| 4.6 | 18/5 | 360 | 21.74% |
| 5 | 1-Apr | 400 | 20% |
| 5.5 | 2-Sep | 450 | 18.18% |
| 6 | 1-May | 500 | 16.67% |
| 6.5 | 2-Nov | 550 | 15.38% |
| 7 | 1-Jun | 600 | 14.29% |
| 7.5 | 13/2 | 650 | 13.33% |
| 8 | 1-Jul | 700 | 12.50% |
| 8.5 | 15/2 | 750 | 11.76% |
| 9 | 1-Aug | 800 | 11.11% |
| 9.5 | 17/2 | 850 | 10.53% |
| 10 | 1-Sep | 900 | 10% |
| 11 | 1-Oct | 1000 | 9.09% |
| 20 | 19/1 | 1900 | 5% |
| 30 | 30/1 | 2900 | 3.33% |
| 40 | 40/1 | 3900 | 2.50% |
| 50 | 50/1 | 4900 | 2% |
| 60 | 60/1 | 5900 | 1.67% |
| 70 | 70/1 | 6900 | 1.43% |
| 80 | 80/1 | 7900 | 1.25% |
| 90 | 90/1 | 8900 | 1.11% |
| 100 | 100/1 | 9900 | 1% |
| 1000 | 1000/1 | 99900 | 0.10% |
Odds and Probabilities - Short Explanation of Odds Formats
Converting odds between different formats and calculating implied probability from odds are important skills in the world of betting and gambling.
The three main types of odds are American, Decimal & Fractional odds. Each format represents the same probability but expressed in a different way.
Let’s go through the formulas required to convert between these formats and to calculate the implied probability.
1. Decimal Odds
Decimal odds are straightforward, representing the amount one wins for every $1 wagered.
Conversion Formulas:
Convert Odds From Fractional to Decimal
Decimal Odds = (Numerator / Denominator) + 1. In fractional odds, such as 5/1 or 1/5, the first number (5 in 5/1) is the numerator, and the second number (1 in 5/1) is the denominator. This format essentially represents the potential profit relative to the stake. For instance, 5/1 means you would win 5 units for every 1 unit staked.
Convert Odds From American to Decimal:
If American odds are positive: Decimal Odds = (American Odds / 100) + 1
If American odds are negative: Decimal Odds = 1 – (100 / American Odds)
Calculating Implied Probability with Decimal Odds:
Implied Probability = (1 / Decimal Odds) * 100%
2. American Odds
American sports-betting odds are either positive or negative numbers.
Conversion Formulas:
Convert Odds From Decimal to American:
- If Decimal odds are greater than 2.00: American Odds = (Decimal Odds – 1) * 100
- If Decimal odds are less than 2.00: American Odds = -100 / (Decimal Odds – 1)
Convert Odds From Fractional to American:
- If Fractional odds are greater than 1: American Odds = Numerator * (100 / Denominator)
- If Fractional odds are less than 1: American Odds = -Denominator * (100 / Numerator)
Calculating Implied Probability with American Odds:
- If American odds are positive: Implied Probability = 100 / (American Odds + 100) * 100%
- If American odds are negative: Implied Probability = -American Odds / (-American Odds + 100) * 100%
3. Fractional Odds
Fractional odds are commonly used in the UK and Ireland.
Conversion Formulas:
From Decimal to Fractional:
Fractional Odds = (Decimal Odds – 1) / 1 (then simplify the fraction)
From American to Fractional:
- If American odds are positive: Fractional Odds = American Odds / 100 (then simplify the fraction)
- If American odds are negative: Fractional Odds = 100 / -American Odds (then simplify the fraction)
Calculating Implied Probability with Fractional Odds:
Implied Probability = Denominator / (Numerator + Denominator) * 100%
