Totals (Over/Under)

How a total settles

A total, or over/under, is a bet on the combined score of both teams. With a total of 47.5, the over wins if the teams combine for 48 or more points, and the under wins at 47 or fewer. A whole-number total can push: at 47, a combined score of exactly 47 returns the stake.

Totals are priced like spreads, usually near −110 on each side, but the price moves as well as the number. Over 47.5 at −120 and Over 48 at −105 are different bets, so compare the number and the price together.

What the full-game total includes

• Football and basketball: overtime points count toward the full-game total.
• Hockey: overtime goals count, and many books add one goal for the shootout winner. Check the house rule.
• Baseball: extra innings count. A game shortened by weather commonly needs a minimum number of innings for totals to stand, often the full nine, or eight and a half if the home team leads.
• Soccer: 90 minutes plus stoppage time; extra time and penalty shootouts don’t count.

Half, quarter, period, and team totals settle on their own segment or team, under the same house rules.

From a total to a probability

In low-scoring sports, a Poisson distribution gives a reasonable first estimate of how often a game goes over. If a soccer match is expected to produce 2.7 goals, the chance of three or more is:

1 − e^(−2.7) × (1 + 2.7 + 2.7² ÷ 2) ≈ 50.6%

Over 2.5 would then be close to a coin flip, so a −110 price on the over, with its 52.38% break-even rate, would be too expensive under this estimate. By the same method, a hockey game expected to produce 6.1 goals goes over 5.5 about 57.0% of the time and over 6.5 about 41.0%.

Poisson assumes goals arrive independently at a steady rate, which isn’t quite true: teams change tactics when leading, and hockey teams pull the goalie late. The Poisson calculator runs the arithmetic, but the expected-goals input is up to you.

Totals in higher-scoring sports

NFL totals mostly fall between the high 30s and the low 50s, and NBA totals typically run well above 200, so the number moves more often than the price. Football totals have weaker key numbers than spreads because many combinations of field goals and touchdowns produce the same combined score. In basketball, pace and efficiency drive totals: a projected 98 possessions per team at 1.15 points per possession suggests about 225 points.

Factors worth checking

• Weather: strong wind affects passing and kicking more than rain or cold does, so check forecasts close to kickoff.
• Ballparks and roofs: parks play very differently, and temperature and wind direction change how far fly balls carry.
• Lineups and goalies: starting pitchers, goaltenders, and rest days change expected scoring more than recent results do.

Markets price widely known factors quickly. Historical scoring averages describe past games; a projection for this one has to account for who is playing and where.