Bonus Bet Calculator

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Bonus Bet Calculator

Understanding Bonus Bet Calculations

A bonus bet (also known as a free bet or promotional bet) is a common offer from online bookmakers. Instead of wagering your own money, you're using a bet provided by the bookmaker. The key difference from a regular bet lies in how your return is calculated: you typically only receive the profit from the bet, not your original stake back (as the stake was provided by the bookmaker).

How the Calculator Works:

This calculator helps you estimate your potential profit and total return when using a bonus bet. It accounts for two main scenarios:

  • Using the full bonus amount: You place the entire bonus bet value on a selection.
  • Using a portion of the bonus amount (your stake): You decide to wager only a part of the bonus bet value.

The Math Behind It:

The calculation depends on the odds format. We handle decimal odds (e.g., 2.50) and fractional odds (e.g., 3/1).

Decimal Odds:

If your odds are in decimal format (e.g., D), the calculation is as follows:

  • Potential Profit = (Bonus Bet Value * Decimal Odds) – Bonus Bet Value
  • Total Return = Bonus Bet Value * Decimal Odds

If you specify a stake (S) less than the bonus bet value (B):

  • Potential Profit = (Stake * Decimal Odds) – Stake
  • Total Return = Stake * Decimal Odds
Fractional Odds:

If your odds are in fractional format (e.g., N/D, where N is numerator and D is denominator):

  • Potential Profit = (Bonus Bet Value * (N / D))
  • Total Return = (Bonus Bet Value * (N / D)) + Bonus Bet Value

If you specify a stake (S) less than the bonus bet value (B):

  • Potential Profit = (Stake * (N / D))
  • Total Return = (Stake * (N / D)) + Stake

Example Calculation:

Let's say you have a $50 Bonus Bet and you place it on a selection with Decimal Odds of 3.00.

  • Calculation: Profit = ($50 * 3.00) – $50 = $150 – $50 = $100
  • Total Return: $50 * 3.00 = $150
  • This means you'd get $150 back in total, consisting of your $100 profit and the original $50 bonus stake (which isn't returned).

Now, if you decide to only use $25 of the bonus on those same 3.00 odds:

  • Calculation: Profit = ($25 * 3.00) – $25 = $75 – $25 = $50
  • Total Return: $25 * 3.00 = $75
  • You'd get $75 back, with $50 being profit and $25 being the portion of the bonus you staked.

If you had 5/1 odds with a $50 Bonus Bet:

  • Calculation: Profit = ($50 * (5 / 1)) = $250
  • Total Return: ($50 * (5 / 1)) + $50 = $250 + $50 = $300
  • You'd get $300 back, with $250 profit.

When to Use This Calculator:

  • Evaluating the potential value of bonus bet offers.
  • Deciding how much of a bonus bet to use on a particular selection.
  • Comparing potential returns across different odds.
function parseFractionalOdds(oddsString) { var parts = oddsString.split('/'); if (parts.length === 2) { var numerator = parseFloat(parts[0]); var denominator = parseFloat(parts[1]); if (!isNaN(numerator) && !isNaN(denominator) && denominator !== 0) { return numerator / denominator; } } return NaN; // Indicate invalid format } function calculateBonusBet() { var bonusAmountInput = document.getElementById("bonusAmount"); var bonusOddsInput = document.getElementById("bonusOdds"); var stakeInput = document.getElementById("stake"); var resultDiv = document.getElementById("result"); var bonusAmount = parseFloat(bonusAmountInput.value); var bonusOddsStr = bonusOddsInput.value.trim(); var stake = parseFloat(stakeInput.value); // Clear previous results and errors resultDiv.innerHTML = "; // — Input Validation — if (isNaN(bonusAmount) || bonusAmount <= 0) { resultDiv.innerHTML = 'Please enter a valid Bonus Bet Value.'; return; } var decimalOdds = NaN; if (!isNaN(parseFloat(bonusOddsStr))) { decimalOdds = parseFloat(bonusOddsStr); } else { decimalOdds = parseFractionalOdds(bonusOddsStr); } if (isNaN(decimalOdds) || decimalOdds 0) { if (stake > bonusAmount) { resultDiv.innerHTML = 'Your stake cannot be greater than the Bonus Bet Value.'; return; } actualStake = stake; } else if (stakeInput.value.trim() !== "" && isNaN(stake)) { resultDiv.innerHTML = 'Please enter a valid number for Stake, or leave blank.'; return; } // — Calculation — var potentialProfit = (actualStake * decimalOdds) – actualStake; var totalReturn = actualStake * decimalOdds; // Format results nicely var formattedProfit = potentialProfit.toFixed(2); var formattedTotalReturn = totalReturn.toFixed(2); // — Display Result — resultDiv.innerHTML = `Potential Profit: $${formattedProfit} Total Return: $${formattedTotalReturn}`; }

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