Negative odds mean you risk more than you'll profit; positive odds mean you profit more than you risk. That's the whole framework. Everything else is just the math filling in the details.
What Do the Numbers Actually Mean?
American moneyline odds are always anchored to $100 — but you don't have to bet $100. That figure is just the reference point the format uses.
A negative number is the favorite. It tells you how much you must wager to profit exactly $100. So -200 means risk $200 to win $100 back as profit. Your total return would be $300 — stake plus profit.
A positive number is the underdog. It tells you how much profit a $100 wager would generate. So +150 means a $100 bet returns $150 in profit, or $250 total.
How Do You Calculate a Moneyline Payout?
Two formulas cover every scenario. For underdogs (positive odds): Profit = (Odds ÷ 100) × Stake. For favorites (negative odds): Profit = (100 ÷ |Odds|) × Stake. Add the stake back to get total payout.
Quick worked examples from real figures:
- $50 at +180 → profit = (180 ÷ 100) × $50 = $90 profit, $140 total
- $50 at -200 → profit = (100 ÷ 200) × $50 = $25 profit, $75 total
- $100 at +100 (even money) → $100 profit, $200 total
For the full breakdown of every formula variation, the moneyline payout formula guide walks through each scenario step by step. Or skip straight to the moneyline bet calculator if you want an instant answer without doing any arithmetic.
What's the Difference Between the Favorite and the Underdog?
The side with negative odds is the favorite — the team or player the book expects to win. The side with positive odds is the underdog. At pick 'em prices, both sides sit near +100/−100, sometimes shaded to −105 or −110 so the book collects a small margin on either outcome.
That margin — called the vig or juice — is baked into every line. It's why the combined implied probabilities of both sides always add up to more than 100%.
What Is Implied Probability on American Odds?
Every moneyline converts directly into a win percentage the odds are implying. For positive odds: 100 ÷ (Odds + 100). For negative odds: |Odds| ÷ (|Odds| + 100).
So +150 implies roughly a 40% chance of winning, and -200 implies roughly 67%. These numbers are worth knowing because they let you judge whether a price actually offers value. The implied probability guide covers this in detail, including how to spot when a line has moved against the public.
How Do American Odds Compare to Decimal Format?
Decimal odds are simpler to multiply but less intuitive for US bettors reading a standard sportsbook board. Converting is straightforward: for positive American odds, divide by 100 and add 1. For negative odds, divide 100 by the absolute value and add 1. So +150 becomes 2.50 decimal; -200 becomes 1.50 decimal. The odds converter tool handles this automatically if you prefer not to run it by hand.
Does the Sport Change Anything?
No. The formulas work identically for NFL, NBA, MLB, NHL, soccer, tennis — any market with moneyline pricing. The only thing that shifts is where the line opens and how much it might move before the game. If you're focused on football specifically, the NFL moneyline calculator applies the same math to football lines directly.
One more thing worth knowing before you start running numbers: all gambling winnings — yes, even a small moneyline win — are taxable income in the US. Must be 21+ to wager at most licensed sportsbooks (18+ in Wyoming and Tennessee). Gambling problem? Call 1-800-GAMBLER.