Introduction
Our free betting odds calculator helps you figure out how much money you can win on a bet before you place it. Just type in your odds and stake, and the tool does the math for you in seconds. It converts between American (moneyline) odds, decimal odds, fractional odds, and implied probability so you can compare lines across different sportsbooks with ease.
The calculator works for single bets and parlays. For a single bet, you will see your profit, total payout, breakeven win rate, and the house edge built into the odds. For a parlay, you can add as many legs as you want, and the tool will multiply the odds together to show your combined payout and true chance of winning. If you are building parlays often, our dedicated parlay calculator offers additional features tailored to multi-leg wagers.
Every result comes with a step-by-step breakdown and a chart so you can see exactly how the numbers work. Whether you bet on the NFL, NBA, MLB, or any other sport, this tool gives you the information you need to make smarter bets.
How to Use Our Betting Odds Calculator
Enter your odds in any format and your bet amount to see your potential profit, total payout, implied probability, and a full step-by-step breakdown of the math.
Single Bet Mode
American (Moneyline) Odds: Type your odds as a positive or negative number, like -110 or +200. The calculator will fill in all other odds formats for you right away.
Decimal Odds: If you have decimal odds instead, type them here (for example, 1.909). The other fields will update to match.
Fractional Odds: Enter fractional odds as a ratio, like 10/11 or 4/1. This is common in UK betting markets. If you need help converting decimals to fractions outside of betting, our decimal to fraction calculator can assist.
Implied Probability: Type a percentage between 0 and 100, like 52.38, to convert a win probability into all three odds formats. For a deeper dive into how probabilities work, try our probability calculator.
Stake: Enter the dollar amount you want to bet. This is how much money you plan to risk on the wager.
Click Calculate to see your profit, total payout, implied probability, breakeven win rate, no-vig fair probability, and house edge. Click Reset to clear all fields and start over.
Parlay Mode
Click the Parlay tab at the top to switch to parlay mode, where you can combine two or more bets into one wager.
Add Odds (American): Type the American odds for one leg of your parlay, like -110 or +150, then click Add Leg or press Enter. Repeat this for each bet you want to include. You need at least two legs.
Toggle Legs On or Off: Use the checkbox next to any leg to include or exclude it from the parlay. This lets you quickly compare different combinations without deleting legs.
Remove a Leg: Click the × button next to any leg to delete it from your parlay entirely.
Stake: Enter the total dollar amount you want to wager on the parlay.
Click Calculate to see your combined decimal odds, parlay profit, total payout, implied probability, and a leg-by-leg breakdown. Click Reset to remove all legs and start fresh.
What Are Betting Odds?
Betting odds are numbers that tell you two things: how much money you can win on a bet and how likely a result is to happen. Every sportsbook uses odds to set prices on games, fights, races, and other events. When you understand odds, you can make smarter choices about where to put your money. Our general odds calculator covers the broader math behind odds and probability if you want to explore further.
The Three Main Odds Formats
American odds (also called moneyline odds) are the most common format in the United States. A negative number like -110 means you need to bet that amount to win $100. A positive number like +200 means you win that amount on a $100 bet. The bigger the negative number, the more likely the outcome is expected to be. The bigger the positive number, the less likely — but the bigger the payout.
Decimal odds are popular in Europe, Canada, and Australia. They show your total payout for every $1 you bet. For example, decimal odds of 2.50 mean a $1 bet pays back $2.50 total — your $1 stake plus $1.50 in profit.
Fractional odds are used mainly in the United Kingdom. They show your profit compared to your stake. Odds of 3/1 (said as "three to one") mean you win $3 for every $1 you bet. You can use our fraction calculator to simplify or convert fractional odds into other ratio forms.
What Is Implied Probability?
Implied probability turns odds into a percentage. It answers the question: "How often does this bet need to win for me to break even?" For example, -110 odds have an implied probability of about 52.38%. That means you need to win more than 52 out of every 100 bets at those odds just to avoid losing money over time. Our percentage calculator can help with other percentage conversions, while the win rate calculator lets you track how your actual win rate compares to the breakeven threshold.
What Is a Parlay?
A parlay combines two or more bets into one. All of your picks must win for the parlay to pay out. Because every leg has to hit, parlays are harder to win — but they pay much more than single bets. The odds of each leg get multiplied together, which is why the potential profit grows fast as you add more legs. For a more detailed look at multi-leg wagering, check out our parlay calculator. You can also use our bet calculator to quickly size individual wagers before combining them into a parlay.
What Is the Vig (House Edge)?
The vig (short for vigorish) is the fee a sportsbook charges on every bet. You will not see it listed as a separate charge. Instead, it is built into the odds. This is why both sides of a coin-flip bet are usually priced at -110 instead of +100. That small difference is how the sportsbook makes money no matter who wins. To strip the vig out and find the true fair odds on any line, use our no vig calculator. Understanding the vig also ties into expected value — our EV calculator can help you determine whether a bet has positive or negative long-term value after accounting for the house edge.