Sports Betting Odds Explained: How to Read American Odds

American betting odds tell you the profit a winning wager pays relative to its stake. Negative odds show how much you would risk to profit $100; positive odds show the profit on a $100 stake. You can convert either format into a break-even probability, but that number is not a verified forecast of the outcome.

The calculations below use hypothetical standard cash bets. Returns are rounded to cents, and percentages to two decimal places. Promotional bets can follow different rules.

Separate the line from the price

In Team A -3.5 (-110), the -3.5 is the point spread: Team A must win by at least four. The -110 is the price that determines the payout. A minus sign in the spread and a minus sign in the odds serve different purposes.

In a moneyline market, the displayed price might simply be Team A -150. In a total, Over 47.5 (-110) combines a scoring threshold with its price. If those distinctions are new, start with moneylines, spreads and totals.

Calculate profit and total return

Negative odds: divide by the absolute odds

At -150, a $15 stake earns $10 profit if it wins. Use the positive magnitude, 150, in the calculation:

Profit = stake × 100 ÷ absolute odds
$15 × 100 ÷ 150 = $10 profit
$15 stake + $10 profit = $25 total return

Positive odds: multiply by the odds

At +150, a $10 stake earns $15 profit if it wins:

Profit = stake × positive odds ÷ 100
$10 × 150 ÷ 100 = $15 profit
$10 stake + $15 profit = $25 total return

Both examples return $25, but the amounts risked differ. A loss costs the full stake. At +100, also called even money, a win earns profit equal to the stake.

Compare every price with the same stake

The odds do not require you to stake $100 or the number after the minus sign. A larger positive price increases the payout for the same outcome and stake. A more negative price reduces it. Neither tells you whether the bet is worth taking without an assessment of its probability.

Turn odds into implied probability

For a bet with only win and loss outcomes, the implied probability is the win rate needed to break even at that price. It comes from dividing the amount at risk by the total return on a win.

• Negative odds: absolute odds ÷ (absolute odds + 100). At -150: 150 ÷ 250 = 60%.
• Positive odds: 100 ÷ (positive odds + 100). At +150: 100 ÷ 250 = 40%.

Multiply a decimal result by 100 to express it as a percentage. For example, 0.523809 becomes 52.38%. When pushes return the stake, this break-even win rate applies among the bets that settle as wins or losses. It assumes a consistent price and excludes other costs.

At -110, winning half your equal-stake bets loses money. A $10 win earns about $9.09; a $10 loss costs $10. One of each leaves a loss of about $0.91.

Why both sides can have negative odds

Negative odds mean the win profit is smaller than the stake. They do not always identify a unique favorite. A two-way spread might have both sides priced at -110, and a closely matched moneyline can also have two negative prices.

Converting -110 and -110 gives about 52.38% for each side, totaling 104.76%. That excess over 100% is called overround. It reflects the margin in the quoted market rather than two outcomes somehow having more than 100% combined probability.

Vig describes the margin embedded in prices. Realized sportsbook hold describes revenue retained relative to stakes over a set of settled wagers; it is a different measure. The vig and no-vig probability guide works through the distinction.

Which price is better?

For the exact same selection, line, period and settlement rules, -110 is better for the bettor than -120. A winning $10 stake profits about $9.09 at -110 versus $8.33 at -120. Likewise, +150 is better than +140: the same $10 win earns $15 rather than $14.

Comparing different lines takes more information. Team A -2.5 at -130 gives a better handicap than Team A -3.5 at -110, but pays less. You need to consider how often Team A wins by exactly three as well as the odds. The apparently nicer line can be too expensive.

Compare only markets you are eligible to use, and keep the original spending limit. Access to another price is not a reason to make another bet.

American and decimal odds express the same payout

Decimal odds include the returned stake. To convert -150, calculate 1 + 100 ÷ 150 = approximately 1.6667. To convert +150, calculate 1 + 150 ÷ 100 = 2.50. A $10 win at 2.50 returns $25 total.

For decimal odds, total return equals stake × decimal odds, and the break-even probability is 1 ÷ decimal odds. Use the original precision where possible and round at the end. DraftKings’ odds guide explains the common display formats and notes that rounding can affect displayed payouts.

Read the selection, line and price separately. Then calculate profit, total return and break-even probability using the same stake.

What to read next

• Vig, overround and no-vig probability: understand the margin in a complete market.
• Expected value in sports betting: test what a probability estimate implies at a particular price.
• Betting 101: put the math alongside budget and settlement checks.