TwinSpires Sports Betting Odds Calculator

Take the guesswork out of sports betting with our TwinSpires Sports odds calculator.

Quickly figure out how much money you can win on a potential bet by inputting the amount you want to wager, along with specific odds on a single or multi-leg parlay event.

How to use the TwinSpires Sports odds calculator

The TwinSpires Sports odds calculator can compute several types of odds, including American odds, decimal odds, fractional odds, and implied probability.

To use the calculator, simply type in your bet amount and select your bet type — whether a single bet or a parlay — and insert the odds you want to calculate.

For example, if you want to bet $100 on the Cincinnati Bengals’ moneyline odds and know their American odds (+285), insert those odds into the calculator.

The calculator will automatically update to show you the decimal odds (3.85), fractional odds (57/20), and implied probability (25.97%).

If you are satisfied with the calculation and would like to place a real money wager, simply click on the blue "BET NOW" button and select your state from the dropdown menu. You will then be taken directly to the main page of the corresponding sportsbook where you can browse multiple sports and markets.

How to calculate a parlay

A parlay is a type of wager in which you can link two or more bets into a single wager to boost your potential payout. To calculate a parlay, click the dropdown menu under bet type and select "Parlay."

You can then type in the odds of each leg you want to bet to find the total potential payout.

For example, let’s say you want to wager $50 on the Houston Rockets’ +130 moneyline odds and the Los Angeles Lakers’ +270 moneyline odds in a two-leg parlay.

Insert each team’s odds and click "ADD BET," and the calculator will instantly display the amount you will win ($375.50) and your total potential payout ($425.50).

What are American odds vs. decimal and fractional odds?

American odds

Commonly used in sports betting, American odds are written as a whole number with a plus (+) or minus (-) sign in front of it.

A plus sign indicates how much money you would win on a wager of $100. For example, +150 odds would earn you an additional $150 on a winning $100 wager.

A minus sign indicates how much money you must risk to win $100. For example, -200 odds mean you must wager $200 to win an additional $100.

You do not need to wager $100 for every bet. This is simply the figure against which American odds are expressed.

Decimal odds

Commonly used in Europe, decimal odds represent the total return for every $1 you wager, including the money you risk.

For example, if you bet $10 on 4.0 odds, the total amount returned on a winning wager would be $40 ($10x4). The potential profit is $30, or $10x4 minus the $10 stake.

Fractional odds

Fractional odds are frequently seen in horse racing and express the potential profit should a bet succeed, relative to its stake.

For example, 3/1 odds would earn you $3 on a $1 bet. Likewise, if you bet $10 at odds of 3/1, the potential profit is $30 ($10 x 3) and the total returned is $40, or $30 plus your $10 stake.

What is implied probability?

Implied probability is the probability (in percentage form) of an outcome occurring, as implied by the bookmaker.

For instance, a 9/1 bet is expected to hit one out of every 10 times, or 10%.

When to use an odds calculator

You can use our odds calculator for any type of bet, from a moneyline wager, to point spreads, totals, prop bets, futures, and live betting!