How to Read Sports Betting Odds: American, Decimal, and Fractional Explained

Moneylines, point spreads, and juice confuse most new bettors. Here's a plain-English breakdown of how sports betting odds work, and how to quickly calculate what you're actually risking.

American Odds: The + and - System

American odds are displayed with a plus or minus sign. A minus number (like -150) tells you how much you need to bet to win $100. A plus number (like +130) tells you how much you win on a $100 bet. So -150 means bet $150 to win $100. +130 means bet $100 to win $130. The minus side is the favorite; the plus side is the underdog. The gap between them, where the sportsbook takes a cut on both sides, is called the juice or vig.

The Point Spread: Equalizing the Matchup

When a team is clearly better, the sportsbook adds a point spread to make both sides roughly 50/50 for bettors. If the Chiefs are -7 against the Raiders, Kansas City needs to win by more than 7 points for a bet on them to pay out. The Raiders can lose by 6 and still cover. Most spread bets are priced at -110 on both sides, meaning you bet $110 to win $100, with the $10 gap being the sportsbook's margin.

Moneyline: Just Pick the Winner

Moneyline bets ignore the point spread entirely, you just pick who wins. The pricing does the work. If the Celtics are -200 moneyline favorites, you bet $200 to win $100. If the Raptors are +170 underdogs, you bet $100 to win $170. Moneylines make more sense for low-scoring sports like baseball and hockey, where one run or goal changes everything and spread betting would be awkward.

Totals (Over/Under): Betting the Score, Not the Winner

A total bet asks whether the combined score of both teams will go over or under a set number. If the total is 214.5 in an NBA game, you're betting on whether both teams combined will score 215+ (over) or 214 or fewer (under). Totals are popular because you don't have to pick a winner, just the pace and style of the game. A high total suggests both teams score a lot; a low total suggests a defensive or slow-paced game.

The Juice: What the Sportsbook Keeps

Standard juice on spread bets is -110 on both sides. That means to win $100 you bet $110. If you lose, you're down $110. If you win, you're up $100. The sportsbook collects the extra $10 regardless of outcome, that's their margin. To beat the vig at -110, you need to win 52.4% of bets just to break even. This is why finding genuine edge matters: you're not just trying to pick winners, you're trying to win often enough to overcome the built-in house cut.

How SharpCapper Uses This

When SharpCapper analyzes a game, it accounts for the current odds and juice as part of its assessment. A pick might look attractive at -3 but become a worse bet at -6 if the line has moved. The AI flags line movement and tells you whether the value still exists at the current price, not just whether the team is likely to cover in a vacuum.