Over/under betting (also called totals betting) is one of the three main bet types in sports. Instead of picking a winner or a margin, you're betting on the total combined score of both teams.
How Totals Betting Works
The sportsbook sets a number — say, the total for an NFL game is 47.5. You bet:
- Over 47.5: Combined points must be 48 or more for you to win
- Under 47.5: Combined points must be 47 or fewer for you to win
Standard pricing is -110 on both sides, meaning you bet $110 to win $100. The same break-even rate applies: you need to be right 52.38% of the time just to break even.
What Determines the Total
Oddsmakers set totals based on:
- Offensive efficiency of both teams
- Defensive efficiency of both teams
- Pace of play
- Weather (for outdoor games)
- Known injuries to offensive or defensive players
The total then moves as betting action comes in. Significant money on the over pushes the total up; money on the under pushes it down.
When Totals Offer Value
Weather-driven: Wind, rain, and cold temperatures suppress NFL scoring. When weather forecasts change late in the week, the total may not fully adjust. Unders in bad-weather NFL games have documented historical value.
Defensive matchups: When two elite defenses meet, the public still bets overs because they watch offense highlights. Books adjust for this, but not always enough.
Back-to-backs in NBA: Teams on back-to-backs score fewer points. When one team is on their second game in two nights, the under on that team's scoring — and potentially the total — becomes more attractive.
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