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Odds Converter: Decimal, Fractional, American Odds and Probability

Use our odds converter to convert decimal, fractional and moneyline odds. Enter your odds in your preferred format and press in convert to get the conversion as well as the implied probability.

Odds Converter

Odds Converter

Odds Conversion Table

Convert sports betting odds with our easy-to-read odds conversion table that includes decimal, fractional & US odds, and probability.

Decimal OddsFractional OddsAmerican OddsImplied Probability
10/∞-∞100%
1.011/100-1000099.01%
1.021/50-500098.04%
1.031/33-333397.09%
1.041/25-250096.15%
1.051/20-200095.24%
1.061/16-166794.34%
1.071/14-142993.46%
1.081/13-125092.59%
1.091/11-111191.74%
1.11/10-100090.91%
1.111/9-90990.09%
1.122/17-83389.29%
1.132/15-76988.5%
1.141/7-71487.72%
1.152/13-66786.96%
1.162/13-62586.21%
1.171/6-58885.47%
1.182/11-55684.75%
1.192/11-52684.03%
1.21/5-50083.33%
1.222/9-45581.97%
1.251/4-40080%
1.282/7-35778.13%
1.33/10-33376.92%
1.331/3-30375.19%
1.357/20-28674.07%
1.364/11-27873.53%
1.42/5-25071.43%
1.444/9-22769.44%
1.459/20-22268.97%
1.478/17-21368.03%
1.51/2-20066.67%
1.538/15-18965.36%
1.574/7-17563.69%
1.63/5-16762.5%
1.628/13-16161.73%
1.635/8-15961.35%
1.662/3-15260.24%
1.77/10-14358.82%
1.728/11-13958.14%
1.84/5-12555.56%
1.835/6-12054.64%
1.99/10-11152.63%
1.9110/11-11052.36%
1.9520/21-10551.28%
21/1+/-10050%
2.0521/20+10548.78%
2.111/10+11047.62%
2.26/5+12045.45%
2.255/4+12544.44%
2.313/10+13043.48%
2.3811/8+13842.02%
2.47/5+14041.67%
2.53/2+15040%
2.68/5+16038.46%
2.6313/8+16338.02%
2.717/10+17037.04%
2.757/4+17536.36%
2.89/5+18035.71%
2.8815/8+18834.72%
2.919/10+19034.48%
32/1+20033.33%
3.121/10+21032.26%
3.1317/8+21331.95%
3.211/5+22031.25%
3.259/4+22530.77%
3.323/10+23030.3%
3.3819/8+23829.59%
3.412/5+24029.41%
3.55/2+25028.57%
3.613/5+26027.78%
3.7511/4+27526.67%
3.814/5+28026.32%
43/1+30025%
4.216/5+32023.81%
4.3310/3+33323.09%
4.57/2+35022.22%
4.618/5+36021.74%
54/1+40020%
5.59/2+45018.18%
65/1+50016.67%
6.511/2+55015.38%
76/1+60014.29%
7.513/2+65013.33%
87/1+70012.5%
8.515/2+75011.76%
98/1+80011.11%
9.517/2+85010.53%
109/1+90010%
1110/1+10009.09%
2019/1+19005%
3030/1+29003.33%
4040/1+39002.5%
5050/1+49002%
6060/1+59001.67%
7070/1+69001.43%
8080/1+79001.25%
9090/1+89001.11%
100100/1+99001%
10001000/1+999000.1%

The Three ways Bookmakers Show Betting Odds

There are three major formats that Canadian sportsbooks use to show betting odds: decimal, fractional and american odds. Let’s break them down.

Decimal Odds

Decimal odds are straightforward, indicating the total payout for every $1 wagered.

Example: 3.00 (wager $1 to receive $3).

Conversion Formula:

  • To Fractional: Decimal Odds−1 converted to a fraction (e.g., 3.00 – 1 = 2/1).
  • To American: If the decimal odds exceed 2.00, multiply by 100 (e.g., 3.00 * 100 = +200). If less than 2.00, multiply by -100 and divide 1 by the decimal odds minus 1 (e.g., −1001.50−1≈−200).

Fractional Odds

Explanation: Fractional odds, favored in the UK, display the profit relative to the stake.

Example: 5/1 (bet $1 to win $5).

Conversion Formula:

  • To Decimal: Convert to a decimal and add 1 (5/1 + 1 = 6.00).
  • To American: If the fraction equals or exceeds 1 (e.g., 5/1), multiply by 100 (500). If less than 1 (e.g., 1/5), it’s negative and calculated as −100Fraction (e.g., -500).

American Odds (Moneyline)

American odds, or moneyline odds, are expressed as positive or negative numbers.

Example: +200 (bet $100 to win $200) or -150 (bet $150 to win $100).

Conversion Formula:

  • To Decimal: If positive, divide by 100 and add 1 (e.g., 200100+1=3.00). If negative, −100Odds+1 (e.g., −100−150+1≈1.67).
  • To Fractional: Convert positive odds to a fraction of the odds over 100 (e.g., 200/100 = 2/1) and negative odds as -100 over the odds (e.g., -100/-150 = 2/3).

Implied Probability

Probability odds express the likelihood of an event occurring in percentages. Implied Probability helps figure out how likely something will happen when you’re thinking about placing a bet but includes the vig or the bookmaker advantage.

Example: 50% (50% chance of the event occurring).

Calculate Your Odds

Use our betting odds calculator, -that automatically converts your odds formats-, to get the possible return or payout of your bets. In our calculator, you will be able to calculate Parlay bets, moneylines, each way bets and more complex bets such as system bets.

How to Convert Odds & Probability – FAQ

Decimal odds: Take 1, divide it by the decimal odds, then multiply by 100 to get a percentage. For example, if the decimal odds are 2, you do (1/2) * 100 to get 50%.

Fractional odds: Start with 1, divide it by the sum of the fractional odds and 1, then multiply by 100 for a percentage. So, if fractional odds are 3/1, you calculate (1 / (3/1 + 1)) * 100 to find it’s 25%.

American odds have two cases:

  • Positive odds: You divide 100 by the sum of the American odds and 100, then multiply by 100 to get a percentage. For example, if the odds are +150, you calculate (100 / (150 + 100)) * 100 to get 40%.

  • Negative odds: First, turn the American odds into a positive number by multiplying by -1. Then, use the formula where you divide the positive odds by the sum of the odds and 100, and multiply by 100 to get a percentage. For example, for odds of -300, you use (300 / (300 + 100)) * 100 to get 75%.

  • Decimal: To get the decimal form, you divide 1 by the percentage turned into a decimal (percentage ÷ 100). For example, for a 50% chance, it’s 1 / (50 ÷ 100) = 2.
  • Fraction: For the fraction form, you do the same as for the decimal but then subtract 1. So, for a 25% chance, it’s (1 / (25 ÷ 100)) – 1 = 3, which means 3/1.
  • American Odds:
    Positive odds: To find positive American odds, you take 100 divided by the percentage as a decimal, then subtract 100. For example, a 10% chance gives you (100 / (10 ÷ 100)) – 100 = 900.
    Negative odds: For negative American odds, you divide the percentage by 1 minus the percentage as a decimal, and then you multiply by -1 to make it negative. For a 60% chance, it’s (60 / (1 – (60 ÷ 100))) × -1 = -150.

To change American odds to decimal odds, you do it differently for positive and negative odds:

For positive odds: Add 1 to the result of dividing the odds by 100. For example, if the odds are 300, you divide 300 by 100 to get 3, then add 1, making it 4.

For negative odds: Subtract the result of dividing 100 by the odds from 1. For instance, if the odds are -300, you divide 100 by -300 to get -0.333, then subtract this from 1, resulting in 1.333.

To change American odds to fractional odds, do this:

For positive odds: Divide the American odds by 100. For example, if the odds are +300, you divide 300 by 100 to get 3/1.

For negative odds: Divide -100 by the American odds. For instance, if the odds are -300, you divide -100 by -300 to get 1/3.

To change fractional odds to decimal, simply add 1 to the fraction. For example, if the fractional odds are 3/1, you add 1 to get 4 as the decimal odds.
  • For positive American odds: Multiply the fraction by 100. For example, odds of 3/1 become (3/1) * 100 = 300.
  • For negative American odds: Divide -100 by the fraction. For example, odds of 1/5 turn into -100 / (1/5) = -500

To change decimal odds to fractional, first, substract 1 from the decimal number. For example, if you have a decimal of 3, you do 3 – 1 = 2. This gives you a fraction of 2/1.

  • If the American odds are positive, subtract 1 from the decimal number, then multiply by 100. For example, if the decimal odds are 3, you do (3 – 1) * 100 to get 200.
  • For negative American odds, divide -100 by the decimal number minus 1. For instance, with decimal odds of 1.2, you calculate -100 / (1.2 – 1) to get -500