Convert moneyline/American odds to decimal, fractional, and implied probability with payout tables, parlay builder, vig analysis, and common odds reference chart.
Moneyline odds (also called American odds) are the primary odds format in North American sports betting. Positive moneyline (+150) shows the profit on a $100 bet; negative moneyline (−200) shows how much you must bet to win $100. This calculator converts moneyline odds to all other formats and provides comprehensive betting analysis.
Enter odds in any of four formats — American/moneyline, decimal, fractional, or implied probability — and get instant conversion to all others, plus a payout table at seven stake levels, a parlay builder showing combined odds for multi-leg bets, and a reference chart of common moneyline values. The implied probability meter provides an intuitive visual of the break-even win rate.
Understanding moneyline odds is essential for evaluating whether a bet offers value. If your estimated probability of a team winning exceeds the implied probability in the odds, the bet has positive expected value. This calculator provides all the numbers you need to make informed decisions.
Moneyline odds are ubiquitous in American sports betting but counterintuitive — positive and negative values work differently, making mental math difficult. This calculator removes the complexity by converting between all four major formats instantly and providing payout tables for quick reference.
The parlay builder is particularly valuable: it shows how quickly probabilities drop and payouts grow as you add legs. The reference chart helps you quickly assess where any moneyline falls on the favorite-to-underdog spectrum, and the implied probability meter provides an intuitive visual anchor.
Positive moneyline (+ML) to decimal: Decimal = 1 + ML/100 Negative moneyline (−ML) to decimal: Decimal = 1 + 100/|ML| Implied Probability = 1 / Decimal Odds Profit = Stake × (Decimal − 1) Total Return = Stake × Decimal Parlay Odds = Product of individual decimal odds
Result: Decimal: 2.50, Fractional: 3/2, Implied Probability: 40.00%, Profit: $150.00
A +150 moneyline means you win $150 profit on a $100 bet (total return $250). The decimal equivalent is 2.50 (you get back 2.5× your stake). The fractional form is 3/2 (win $3 for every $2 staked). The implied probability is 40% — if the team wins more than 40% of the time, this is a value bet. A 3-leg parlay at these odds pays 15.63× ($1,562.50 on $100).
The moneyline format originated in the United States and remains unique to North American sports betting markets. It was designed around the concept of a $100 base bet, which was a significant wager in the early 20th century. Positive and negative values create an intuitive "over/under $100" framework for bettors thinking in dollar terms, though the mathematics behind it follows the same principles as decimal or fractional odds used elsewhere.
The bookmaker's edge (vigorish or juice) is embedded in the odds through overround — the total implied probability exceeding 100%. A standard −110/−110 market has 4.5% overround. Sharp bettors calculate the "true" (no-vig) probability by removing the overround and then compare it to their own estimated probability. Consistent positive expected value (+EV) is the foundation of profitable long-term betting.
In point-spread betting, the line adjusts to create roughly equal action on both sides (typically at −110). Moneyline betting eliminates the point spread — you simply pick the winner. Favorites have large negative moneylines (high cost for modest returns), while underdogs offer attractive positive moneylines but must win outright. The relationship between point spread and moneyline follows a conversion curve that varies by sport and total points expected.
A +150 moneyline means you win $150 profit on a $100 bet. Positive moneylines always indicate underdogs (less than 50% implied probability). The larger the positive number, the bigger the underdog and the higher the potential payout.
A -200 moneyline means you must bet $200 to win $100 profit. Negative moneylines indicate favorites. The larger the negative number, the bigger the favorite. -200 implies a 66.7% probability — you'd need to win 2 out of 3 bets just to break even.
Implied probability is the break-even win rate embedded in the odds. If you bet at +150 (40% implied probability), you need to win more than 40% of the time to be profitable long-term. It's calculated as 1 / decimal odds.
Yes. The combined implied probabilities of all outcomes in a market sum to more than 100% — the excess is the bookmaker's vig (vigorish/juice). For a -110/-110 market, each side has 52.4% implied probability, totaling 104.8%; the 4.8% excess is the vig.
A parlay combines multiple bets. All legs must win for the parlay to pay. Multiply the decimal odds of each leg to get the combined decimal odds. A 3-leg parlay at 2.50 × 2.00 × 1.80 = 9.00x total odds. Parlays are high-risk, high-reward — the house edge compounds with each leg.
-110 is the standard "vig" line for point-spread and totals bets. Both sides are priced at -110, meaning you bet $110 to win $100. The bookmaker collects $220 from two opposite bets and pays out $210, keeping $10 (4.5% margin). This is the bookmaker's profit mechanism.