Betting Odds Calculator

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Betting Odds Calculator
American Odds (e.g., -110, +200)Decimal Odds (e.g., 1.91, 3.00)Fractional Odds (e.g., 5/1, 1/2)
Calculation Results:
Potential Profit: $ 0.00
Total Payout: $ 0.00
Equivalent Odds:
American:
Decimal:
Fractional:
Implied Probability:
function calculateOdds(){var stake=parseFloat(document.getElementById('bet_amount').value);var rawOdds=document.getElementById('odds_value').value.trim();var type=document.getElementById('odds_type').value;var showConv=document.getElementById('show_conversions').checked;if(isNaN(stake)||stake0){decimalOdds=(am/100)+1;}else if(am<0){decimalOdds=(100/Math.abs(am))+1;}else{alert('Odds cannot be zero.');return;}}else if(type==='decimal'){decimalOdds=parseFloat(rawOdds);if(isNaN(decimalOdds)||decimalOdds=2){calcAm=(decimalOdds-1)*100;}else{calcAm=-100/(decimalOdds-1);}document.getElementById('convAm').innerHTML=(calcAm>0?'+':")+Math.round(calcAm);document.getElementById('convDec').innerHTML=decimalOdds.toFixed(2);var fVal=decimalOdds-1;var bestDen=1000;var bestNum=Math.round(fVal*bestDen);function gcd(a,b){return b?gcd(b,a%b):a;}var common=gcd(bestNum,bestDen);document.getElementById('convFrac').innerHTML=(bestNum/common)+'/'+(bestDen/common);document.getElementById('convProb').innerHTML=((1/decimalOdds)*100).toFixed(2)+'%';}else{document.getElementById('conversionSection').style.display='none';}}

Calculator Use

The betting odds calculator is an essential tool for sports bettors and casual gamblers alike. It allows you to quickly determine how much you stand to win based on your wager and the specific odds offered by a sportsbook. By entering just two pieces of information—your bet amount and the odds—the calculator provides your potential profit and total payout.

This tool supports the three most common odds formats used globally: American, Decimal, and Fractional. Additionally, it calculates the implied probability of an outcome, which helps you identify "value" in a bet by comparing the bookmaker's estimation to your own analysis.

Odds Format
Select the format provided by your bookmaker. American odds use +/- prefixes, Decimal odds use numbers like 2.50, and Fractional odds use ratios like 5/1.
Bet Amount
The total amount of money you are risking on the wager (your stake).
Odds Value
The numerical value representing the likelihood of the event and the potential return on investment.

How It Works

To understand how the betting odds calculator arrives at its results, you need to know the underlying math for each format. Regardless of the format, the goal is always to find the Payout = Stake + Profit.

Decimal Payout = Stake × Decimal Odds

  • American Odds: If positive (+200), you win $200 for every $100 bet. Formula: Profit = Stake × (Odds/100). If negative (-110), you must bet $110 to win $100. Formula: Profit = Stake / (Odds/100).
  • Decimal Odds: These represent the total payout rather than just profit. A 2.00 odd means you get $2 back for every $1 bet (your $1 stake + $1 profit).
  • Fractional Odds: Common in the UK. A 5/1 odd means you win 5 units for every 1 unit staked. Formula: Profit = Stake × (Numerator/Denominator).
  • Implied Probability: This converts odds into a percentage. Formula for Decimal: 1 / Decimal Odds.

Calculation Example

Example: You want to place a $50 bet on a football team listed at American odds of +150.

Step-by-step solution:

  1. Identify Stake = $50
  2. Identify Odds = +150 (Positive American)
  3. Calculate Profit: $50 × (150 / 100) = $50 × 1.5 = $75
  4. Calculate Total Payout: $50 (Stake) + $75 (Profit) = $125
  5. Determine Implied Probability: 100 / (150 + 100) = 40%

Common Questions

What are "even money" odds?

Even money odds represent a bet where the potential profit is exactly equal to the stake. In American odds, this is +100 or -100. In Decimal, it is 2.00, and in Fractional, it is 1/1. The implied probability is 50%.

Why do odds change?

Sportsbooks adjust odds based on the amount of money being wagered on each side of a bet, new information (like injuries), or to maintain a balanced book. Using a betting odds calculator helps you track these changes and find the best time to place your wager.

What is the "Vig" or Juice?

The vig is the commission the bookmaker takes for facilitating the bet. You can see the vig by adding up the implied probabilities of all outcomes in an event; if they exceed 100%, the difference is the bookmaker's margin.

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