Betting Odds Calculator

Use this calculator to convert betting odds between formats, calculate your potential profit, and work out parlay payouts — all in one place.

Enter your stake and odds in any format and the calculator instantly updates all other fields and shows your results. No need to press a button.

How to use the odds calculator

Single bet

1. Enter your bet amount: Type the amount you want to wager in the Bet Amount field. This can be any amount — the calculator treats it as your stake.
2. Enter the odds in any format: Fill in just one of the four odds fields — American, Decimal, Fractional, or Implied Probability. The other three will auto-fill instantly.
3. Read your results: The results section shows your Total Odds, the profit you stand To Win, and your Total Payout (profit + stake returned). These fields update automatically and cannot be edited directly.
4. Reset when done: Hit the Reset All button to clear everything and start a new calculation from scratch.

Parlay

1. Switch to Parlay mode: Click the Parlay toggle at the top of the calculator. The interface will switch to show individual bet legs.
2. Enter odds for each leg: The calculator starts with two legs. Enter the American odds for each. Use the + Add Another Leg button to add more selections to your parlay.
3. Remove legs if needed: If you have more than two legs, an X button appears next to each one so you can remove it. The minimum is two legs.
4. Check your combined payout: The results section shows the combined parlay odds, your potential profit, and the total payout if all legs win.

Understanding the results

The odds for your bet displayed in American format. For parlays, this is the combined odds

The profit you would receive if your bet wins. This does not include your original stake — it is the net gain only.

Your profit plus your original stake returned. This is the full amount you would receive back from a winning bet.

A $10 bet at +110 odds wins you $11 in profit (To Win). Your Total Payout would be $21 — the $11 profit plus your $10 stake returned.

Sportsbooks around the world display odds in different formats. They all represent the same thing — the likelihood of an outcome and what you get paid if it wins. Here is what each format means:

+150 / -110
Positive odds show profit per $100 wagered. Negative odds show how much you need to bet to win $100. Most common in the US.

2.50
Represents total return per dollar wagered, including your stake. Multiply your bet by the decimal to get your full payout. Common in Europe and Australia.

3/2
Multiply your stake by the fraction to get your profit. A $10 bet at 9/1 returns $90 profit. Widely used in the UK and Ireland.

40%
The percentage chance the sportsbook is giving this outcome. Useful for comparing a book's odds against your own assessment of the true probability.

Implied probability vs. true odds

Every set of odds has an implied probability baked in — the sportsbook's view of how likely the outcome is to happen. Understanding the difference between implied probability and your own estimated probability is key to finding good value bets.

When both sides of a market are priced at -110, each outcome is given an implied probability of 52.38%. The two sides add up to more than 100%, which is how the sportsbook builds in its margin (also called the vig or juice).

Your true odds are your personal estimate of how likely something is to happen, based on your own research or model. If you believe an outcome has a higher chance of winning than the implied probability suggests, that is a bet with positive value.

Example

A team is priced at +320, giving them an implied probability of 23.8%. If your analysis gives them a 30% chance of winning, the implied probability is lower than your true odds — making this a potentially valuable bet.