function calculateTeaserResults() {
var wager = parseFloat(document.getElementById('wagerAmount').value);
var teams = parseInt(document.getElementById('numTeams').value);
var odds = parseFloat(document.getElementById('americanOdds').value);
if (isNaN(wager) || isNaN(teams) || isNaN(odds) || teams 0) {
profit = wager * (odds / 100);
impliedProbability = 100 / (odds + 100);
} else {
profit = wager * (100 / Math.abs(odds));
impliedProbability = Math.abs(odds) / (Math.abs(odds) + 100);
}
var totalReturn = wager + profit;
// Break-even per leg calculation: (Total Implied Prob)^(1/n)
// This tells you what percentage each leg must hit for the bet to be neutral EV
var legBreakEven = Math.pow(impliedProbability, 1 / teams) * 100;
document.getElementById('potentialProfit').innerText = "$" + profit.toFixed(2);
document.getElementById('totalReturn').innerText = "$" + totalReturn.toFixed(2);
document.getElementById('impliedProb').innerText = (impliedProbability * 100).toFixed(2) + "%";
document.getElementById('breakEvenLeg').innerText = legBreakEven.toFixed(2) + "%";
document.getElementById('teaser-results').style.display = 'block';
}
What is a Teaser Odds Calculator?
A Teaser Odds Calculator is a specialized tool for sports bettors to evaluate the mathematical viability of teaser bets. Unlike a standard parlay, a teaser allows you to adjust the point spread or total in your favor across multiple games. However, in exchange for this advantage, the sportsbook offers lower payouts.
This calculator helps you determine the break-even percentage per leg. In sports betting, knowing how often an individual leg must win to make the overall teaser profitable is the key to identifying "Value" and avoiding "Sucker Bets."
How to Use the Calculator
Wager Amount: The total amount of money you are risking.
Number of Teams: How many selections (legs) are included in your teaser.
Teaser Odds: The price the sportsbook is charging (e.g., -120 for a 2-team 6-point NFL teaser).
Teaser Points: The number of points you are adding to the spread or total (typically 6, 6.5, or 7 for NFL).
The Math of Teasers: Why "Break-Even Per Leg" Matters
The most important metric in teaser betting is the individual leg probability. If you are betting a 2-team teaser at -120 odds, the implied probability of the total ticket is roughly 54.5%. To find the break-even point for a single leg, you calculate the square root of that probability.
For example, if the required break-even per leg is 73.8%, but you believe your adjusted spread only covers 70% of the time, the teaser is a losing proposition in the long run (Negative Expected Value). High-level bettors use this tool to ensure they are getting enough "points" to justify the cost of the odds.
Standard NFL Teaser Reference Table
Teams
Standard Odds
Break-Even Per Leg
2 Teams
-120
~73.9%
3 Teams
+160
~72.7%
4 Teams
+260
~73.1%
Expert Tip: The "Wong Teaser" Strategy
Named after gambling author Stanford Wong, "Wong Teasers" involve teasing NFL lines that cross the most common margins of victory: 3 and 7. By teasing an underdog of +1.5 up to +7.5, or a favorite of -7.5 down to -1.5, you capture the two most frequent outcomes in professional football, often exceeding the required break-even percentage calculated by this tool.