Moneyline Odds Calculator. Enter your bet amount and American moneyline odds to see your expected winnings, total payout, and implied probability. The calculator also converts your odds into decimal and fractional formats automatically. Works for both favorite (negative odds) and underdog (positive odds) wagers. Also try the calculate Kelly Criterion Recommended Bet Amount.
Moneyline odds (also called American odds) show how much you win relative to a $100 wager. Negative odds (e.g. -110) mean you must bet that amount to win $100 — these are favorites. Positive odds (e.g. +150) mean a $100 bet wins that amount — these are underdogs. See also our Parlay Calculator.
For positive odds: Winnings = (Odds / 100) × Stake. For negative odds: Winnings = (100 / |Odds|) × Stake. Your total payout is always Winnings + your original Stake returned.
For positive American odds: Decimal = (American / 100) + 1. For negative American odds: Decimal = (100 / |American|) + 1. For example, -110 converts to 1.9091 and +150 converts to 2.50.
For positive odds: the fraction is Odds/100 simplified (e.g. +150 = 3/2). For negative odds: the fraction is 100/|Odds| simplified (e.g. -200 = 1/2). This calculator displays the decimal equivalent of the fraction for precision.
For negative odds: Implied Probability = |Odds| / (|Odds| + 100) × 100. For positive odds: Implied Probability = 100 / (Odds + 100) × 100. For example, -110 implies a 52.38% chance of winning.
Implied probability is the likelihood of an outcome as suggested by the odds. Sportsbooks build in a margin (the 'vig' or 'juice'), so the combined implied probabilities of both sides usually exceed 100%. Finding bets where the true probability is higher than the implied probability is the goal of value betting.
-110 is the most common standard line in sports betting. It means you must bet $110 to win $100 — the extra $10 is the sportsbook's margin (vig). True even-money would be +100 on both sides, but books rarely offer that.
Absolutely. Just enter your actual bet amount in the Bet Amount field. The calculator scales all results — winnings, payout, and implied probability — to your specific wager, regardless of the size. You might also find our Total Payout — Decimal Odds useful.