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One price, written four ways. Type odds in American (−110), decimal (1.91), fractional (10/11) or as a percentage, and this page restates it in the other three along with what a $100 stake would win. Below that, enter both sides of one market to see how much of the price is the sportsbook’s margin. Everything is worked out in your browser: no account, nothing sent anywhere.
| American | Decimal | Fractional | Implied |
|---|---|---|---|
| −500 | 1.20 | 1/5 | 83.3% |
| −300 | 1.33 | 1/3 | 75.0% |
| −200 | 1.50 | 1/2 | 66.7% |
| −150 | 1.67 | 2/3 | 60.0% |
| −120 | 1.83 | 5/6 | 54.5% |
| −110 | 1.91 | 10/11 | 52.4% |
| +100 | 2.00 | 1/1 | 50.0% |
| +120 | 2.20 | 6/5 | 45.5% |
| +150 | 2.50 | 3/2 | 40.0% |
| +200 | 3.00 | 2/1 | 33.3% |
| +300 | 4.00 | 3/1 | 25.0% |
| +500 | 6.00 | 5/1 | 16.7% |
Decimal odds are the amount returned per unit staked, stake included, so 2.50 means a $10 bet comes back as $25. Because that one number already contains the whole price, it is the easiest form to convert from and to. The tool turns whatever you type into a decimal first, then writes that decimal out in the other three formats, so the four answers can never disagree with each other.
A plus price is the profit on a $100 stake, so +150 is 150 ÷ 100 + 1 = 2.50. A minus price is the stake needed to profit $100, so −200 is 100 ÷ 200 + 1 = 1.50. Going back, a decimal of 2.00 or more becomes (decimal − 1) × 100 with a plus sign, and anything under 2.00 becomes −100 ÷ (decimal − 1). Even money is +100 and −100 at once, which is why both are the same 2.00.
Fractional odds drop the stake and keep only the profit, written as a ratio: 3/2 means three units won for every two risked, which is decimal 2.50 with the one taken off. To convert a decimal, subtract one and write what is left as the simplest fraction a person would say out loud. That is why −110 comes out as 10/11 rather than 91/100: the tool picks the nearest fraction with a denominator of 100 or less.
Divide one by the decimal odds and you have the share of the time the bet would need to win just to break even at that price: 1 ÷ 1.91 is 52.4%. It is the price restated as a probability, with the sportsbook’s margin still inside it. It is not anybody’s forecast of the result, and the two sides of the same market will add up to more than 100% because of that margin.
A sportsbook prices both sides of a market so that their implied probabilities add up to more than 100%. The amount over 100% is its margin, sometimes called the vig, juice or hold. At −110 on both sides each side implies 52.38%, the pair adds to 104.76%, and the book keeps 4.55% of everything wagered on that market if the money splits evenly.
Take a lopsided line: −150 on one side, +130 on the other. Those imply 60.00% and 43.48%, which add to 103.48%, so the margin is 3.36%. Divide each side by that total and the margin comes back out: 57.98% and 42.02%, which now add to exactly 100%. Written as prices, that is −138 and +138.
Those last two numbers are usually called the fair or no-vig price. They are still the sportsbook’s own opinion, with its cut removed; they are not a forecast from this page and they do not say which side to take. Dividing by the total is the simplest way to remove a margin and the one most calculators use. Other methods take more of the margin off the longer price, so on a heavily lopsided market they can differ from this one by a point or so.
For a plus price, divide by 100 and add one: +150 becomes 2.50. For a minus price, divide 100 by the number without its sign and add one: −200 becomes 1.50 and −110 becomes 1.91. The decimal figure is the total you get back per unit staked, so 2.50 returns $25 on a $10 winner, the stake included.
Convert it to decimal odds and divide one by the result. −110 is 1.9091 in decimal, and 1 ÷ 1.9091 is 52.4%; +200 is 3.00, which is 33.3%. That figure is the break even rate at that price with the sportsbook’s margin still included, so it describes the price rather than predicting the game.
You win 10 for every 11 you stake, and get the 11 back as well. It is the fractional way of writing −110, or 1.91 in decimal odds. Fractional odds always state profit over stake, so 2/1 doubles your money as profit and 1/2 wins half your stake.
Add the implied probabilities of both sides. Anything over 100% is the margin. −110 on both sides adds to 104.76%, and the book’s share of the money is 4.76 ÷ 104.76, or 4.55%. Enter both prices in the margin section of this page and it does the sum for you, along with each side’s probability once the margin is taken out.
No. The no-vig price is the sportsbook’s own estimate with its cut removed, not an independent one, so a price that beats it only tells you one book disagrees slightly with its own market. Whether a bet is worth taking depends on how often the outcome actually happens, which no conversion can tell you.
Odds and lines come from licensed data feeds and refresh on a schedule; hit rates and grades are Parlay Builder’s own calculations.