Bet Calculator

Q: What is the difference between profit and total payout?

Profit is only the money you win. Total payout is your profit plus your original stake given back to you. For example, if you bet $100 and your total payout is $250, your profit is $150.

Q: How do I read American odds?

A minus sign (like -110 ) means you must bet that amount to win $100. A plus sign (like +150 ) means you win that amount on a $100 bet. 2 The calculator handles all the math for you once you type in the number.

Q: How do I read fractional odds?

Fractional odds show profit as a ratio. Odds of 3/1 mean you win $3 for every $1 you bet. Odds of 1/2 mean you win $1 for every $2 you bet.

Q: How many legs can I add to a parlay?

There is no limit in the calculator. You can keep clicking Add Leg to add as many legs as you want. Keep in mind that each extra leg makes the parlay much harder to win.

Q: Why is my parlay payout so much higher than a single bet?

In a parlay, the odds of each leg multiply together. 2 This creates a much larger combined odds number. The trade-off is that every single leg must win for you to get paid. More legs means a bigger payout but a much lower chance of winning.

Introduction

Our free bet calculator helps you figure out how much money you can win on a bet before you place it. Just enter your stake and odds, and the tool works out the numbers. It shows your profit, total payout, implied probability, ROI, and house edge all in one place.

This calculator works with all three major odds formats: American (moneyline), decimal (EU), and fractional (UK). You can switch between them at any time, and the tool will convert your odds automatically. It also supports parlay bets, so you can add multiple legs and see your combined payout and probability.

Every result comes with a step-by-step breakdown that shows exactly how the numbers are calculated. This tool makes it easy to understand the true value of any wager and spot the house edge built into the odds.

How to Use Our Bet Calculator

Enter your stake and odds to instantly see your potential profit, total payout, ROI, implied probability, and more. This calculator works for both single bets and parlay bets.

Pick your odds format. Use the buttons at the top to choose American (e.g., -110), Decimal (e.g., 1.909), or Fractional (e.g., 10/11). All odds you enter will follow this format.

Choose your bet type. Click the Single Bet tab for one straight wager. Click the Parlay Bet tab to combine two or more bets into one.

Enter your stake. Type the dollar amount you want to wager in the Stake field. This is the money you are putting down on the bet.

Enter your odds (Single Bet). Type the odds from your sportsbook into the Odds field. The calculator will show your profit, payout, and implied probability right away.

Enter your leg odds (Parlay Bet). Type the odds for each leg of your parlay. Click Add Leg to add more picks. Use the checkbox next to each leg to include or exclude it from the calculation. Click the X button to remove a leg you no longer need.

Click Calculate. Press the Calculate button to see your full results, a step-by-step breakdown of the math, and a visual chart of your potential payout.

What Is a Bet Calculator?

A bet calculator is a tool that tells you how much money you can win from a sports bet. You enter your stake (the amount you want to bet) and the odds from a sportsbook. The calculator then shows your profit, total payout, and other helpful numbers. It saves you from doing the math yourself and helps you make smarter choices before you place a bet.

How Betting Odds Work

Odds tell you how likely a sportsbook thinks an outcome is and how much they will pay you if you win. There are three common formats:

American (Moneyline) odds use plus and minus signs. A minus number like -110 means you must bet $110 to win $100.² A plus number like +150 means a $100 bet wins you $150.²
Decimal (EU) odds show your total payout per dollar bet.³ Odds of 2.50 mean you get $2.50 back for every $1 you wager, including your original dollar.
Fractional (UK) odds show profit as a ratio. Odds of 3/2 mean you win $3 for every $2 you bet.

All three formats describe the same thing in different ways.² This calculator converts between them instantly so you can use whichever one you prefer.

Single Bets vs. Parlay Bets

A single bet is a wager on one outcome. You pick one team or one result, and you either win or lose. It is the simplest type of sports bet.

A parlay bet combines two or more picks into one wager. Every pick (called a "leg") must win for the parlay to pay out.² Because it is harder to win every leg, the payout is much higher than placing each bet on its own. The more legs you add, the bigger the potential payout, but the lower your chance of winning.

Key Terms in the Results

Profit: The money you win on top of your original stake.
Total Payout: Your profit plus your stake returned to you.
ROI (Return on Investment): Your profit shown as a percentage of your stake. It tells you how much you earn per dollar risked.
Implied Probability: The chance of winning that the odds suggest. Lower odds mean the sportsbook thinks that outcome is more likely.
Break-Even Win Rate: The minimum percentage of the time you need to win this bet to not lose money over many tries.
House Edge (Vig): The built-in fee the sportsbook charges. It is baked into the odds so the book makes money no matter which side wins, as long as the money on each side is balanced.¹ The calculator shows the vig a market would carry if both sides were priced at the odds you entered. A lower vig means better value for you.
Fair Value Odds: The odds of an even two-way market with no house edge at all: +100, or 2.00 in decimal odds, for a single bet. For a market whose two sides are priced differently, enter both prices in the No Vig Calculator to find its fair odds.

Tips for Using This Calculator

Always check the implied probability before you bet. If you believe a team wins more often than the implied probability suggests, the bet may have positive expected value. Use the house edge number to compare lines across different sportsbooks. A smaller vig means you keep more of your winnings. For parlays, remember that each leg you add makes the bet much harder to win, even though the payout grows fast.

Formulas used

American Odds to Decimal Odds (Positive)

d = \frac{a}{100} + 1

American Odds to Decimal Odds (Negative)

d = \frac{100}{|a|} + 1

Profit (excluding stake)

\text{Profit} = \text{Stake} \times (d - 1)

Total Payout (including stake) ³

\text{Payout} = \text{Stake} \times d

Implied Probability ¹

\text{Implied} = \frac{1}{d} \times 100\%

House Edge / Vig (two-way market with both sides at the same odds) ¹

\text{Vig} = \left(\frac{2}{d} - 1\right) \times 100\%

Parlay Combined Decimal Odds ²

d_{\text{parlay}} = d_1 \times d_2 \times \cdots \times d_n

Frequently asked questions

What is a stake in sports betting?

Your stake is the amount of money you put down on a bet. For example, if you bet $50 on a game, your stake is $50. Enter this number in the Stake field of the calculator to see what you could win.

What is the difference between profit and total payout?

Profit is only the money you win. Total payout is your profit plus your original stake given back to you. For example, if you bet $100 and your total payout is $250, your profit is $150.

How do I read American odds?

A minus sign (like -110) means you must bet that amount to win $100. A plus sign (like +150) means you win that amount on a $100 bet.² The calculator handles all the math for you once you type in the number.

How do I read decimal odds?

Decimal odds show your total payout for every $1 you bet. If the odds are 2.50, you get $2.50 back for each $1 wagered. That includes your original $1, so your profit is $1.50 per dollar.

How do I read fractional odds?

Fractional odds show profit as a ratio. Odds of 3/1 mean you win $3 for every $1 you bet. Odds of 1/2 mean you win $1 for every $2 you bet.

What does implied probability mean?

Implied probability is the chance of winning that the odds suggest. For example, -200 American odds have an implied probability of 66.67%. This means the sportsbook prices that outcome as having about a two-in-three chance of happening.

What is the house edge or vig?

The vig (short for vigorish) is the fee built into the odds by the sportsbook. It is how they make money. Point spreads are usually priced at -110 on both sides.² That line has a vig of about 4.76%. Lower vig means better value for you.

What are fair value odds?

Fair value odds are what the odds would be if the sportsbook charged no vig at all. For a single bet the calculator shows the fair odds of an even two-way market, +100 (2.00 decimal). If the two sides of your market are priced differently, the No Vig Calculator finds the fair odds from both prices.

How many legs can I add to a parlay?

There is no limit in the calculator. You can keep clicking Add Leg to add as many legs as you want. Keep in mind that each extra leg makes the parlay much harder to win.

Why is my parlay payout so much higher than a single bet?

In a parlay, the odds of each leg multiply together.² This creates a much larger combined odds number. The trade-off is that every single leg must win for you to get paid. More legs means a bigger payout but a much lower chance of winning.

What does break-even win rate mean?

It is the minimum percentage of the time you need to win this bet to not lose money over many bets. If the break-even rate is 52.38%, you need to win more than 52.38 out of every 100 similar bets to make a profit long term.

What does ROI mean in betting?

ROI stands for Return on Investment. It shows your profit as a percentage of your stake. An ROI of 90.91% on a $100 bet means you would profit $90.91 if you win.

Does a negative house edge mean the bet is in my favor?

Not by itself. The house edge here assumes both sides of the market carry the price you entered, so a negative number only means your price is longer than even money, such as +150. Whether a bet has positive expected value depends on its real chance of winning: it does only if you win more often than the break-even win rate shown in the results.

Sources

Wunderlich F, Memmert D. The Betting Odds Rating System: Using soccer forecasts to forecast soccer. PLOS ONE. 2018;13(6):e0198668; Transferring betting odds to probabilities; S1 File, Appendix A. doi:10.1371/journal.pone.0198668. Accessed September 29, 2026.

Massachusetts House Rules. Caesars Sportsbook. 2024;p. 7, Parlay Rules; p. 14, Calculations for wager types. Accessed September 29, 2026.

Kelly JL Jr. A New Interpretation of Information Rate. Bell System Technical Journal. 1956;p. 920 (odds as dollars returned per dollar bet, stake included). Accessed September 29, 2026.

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