An over/under, also called a total, is a bet on the combined score of both teams against a number the sportsbook sets. You bet the over if you think the two teams together will score more than that number, and the under if you think they will score fewer. Who wins the game does not matter.
Say a sportsbook sets the total for a football game at 44.5 (an example, not a live line). The game ends 27-20. Add the two scores and you get 47, which is above 44.5, so the over wins and the under loses. A 17-14 final adds up to 31, and the under wins.
How to read an over/under line
A sportsbook shows the total once, with a price on each side. In American odds a typical board looks like this:
| Example bet | Line | Price | Profit on $110 | Profit on $10 |
|---|---|---|---|---|
| Over | 44.5 | -110 | $100.00 | $9.09 |
| Under | 44.5 | -110 | $100.00 | $9.09 |
You will also see it written in short as O 44.5 -110 and U 44.5 -110. The -110 means you risk $110 to win $100, so a $10 bet returns $19.09 if it wins: the $10 stake plus $9.09 profit (10 x 100 / 110). Our guide to how betting odds work covers plus prices and decimal odds as well.
What -110 on both sides costs you
At -110 you have to win 52.38% of your bets just to break even, because 110 divided by 210 is 0.5238. A coin flip is not enough. That gap is the sportsbook’s margin, often called the vig, the juice or the hold.
The arithmetic is easy to see with two bettors. One puts $110 on the over and the other puts $110 on the under. The book holds $220, pays the winner $210 (stake plus $100), and keeps $10. That is 4.55% of the money bet (10 / 220), whichever side wins.
Prices move when one side gets more money. If the over goes to -115 and the under to -105, the over now needs 53.49% to break even (115 / 215) and the under 51.22% (105 / 205). The two still add up to more than 100%, at 104.71% against 104.76% before, so the book keeps its margin while it shifts the cost toward the busier side. The same sum is how to calculate a book’s overround on any market.
How a total is set, and how close it gets
A sportsbook opens the total from its own projection of the combined score, then moves the number or the prices as bets come in. The test of a total is how it does against real scores over a full season. Here are five, read from ESPN’s season results and the pre-game total ESPN lists for each game:
| League and season | Games with a total | Average total | Average combined score | Overs | Unders | Pushes |
|---|---|---|---|---|---|---|
| NFL 2025 regular season | 270 | 44.8 points | 46.0 points | 142 | 128 | 0 |
| NBA 2025-26 regular season | 1,230 | 230.7 points | 231.2 points | 608 | 622 | 0 |
| MLB 2026 regular season | 2,430 | 8.4 runs | 9.0 runs | 1,172 | 1,149 | 109 |
| NHL 2025-26 regular season | 1,309 | 6.1 goals | 6.3 goals | 667 | 642 | 0 |
| Premier League 2025-26 | 250 | 2.7 goals | 2.7 goals | 119 | 131 | 0 |
Over a season the average total ends up close to the average score: about half a run apart in baseball and just over a point apart in the NFL. Overs and unders split close to half and half in every league. On a single night the miss is large. The median NFL game in 2025 finished 9.5 points away from its total, and the median NBA game in 2025-26 finished 12.5 points away. A total is a good estimate of the average game and a poor guess at any one of them, which is why both sides find takers at the same price.
Pushes and half points
If the combined score lands exactly on the total, the bet is a push: nobody wins, and your stake comes back. A total of 47 with a 27-20 final is a push.
A half point rules that out, since no game ends with a score of 44.5. Every pre-game total in the table above for the NFL, NBA, NHL and Premier League was a half number. Baseball is the exception: 1,198 of the 2,430 MLB totals in 2026 were whole numbers, such as 8 or 9, and 109 of those games pushed, about 9.1%.
A push inside a parlay does not lose the ticket. Circa Sports’ house rules, for example, drop the pushed leg and pay the rest at the reduced odds; a two-leg parlay with one push becomes a straight bet on the other leg. Our parlay guide shows how the remaining legs multiply.
Some books also post quarter totals, mostly in soccer. Pinnacle’s rules explain that a total of 2.75 is two bets in one: half your stake goes on 2.5 and half on 3. Over 2.75 with exactly three goals wins the 2.5 half and pushes the 3 half.
Totals by sport
Each sport scores differently, so its totals sit on different numbers and settle under slightly different rules. The rules below are from two published rulebooks, Circa Sports’ house rules and Pinnacle’s betting rules, both read on 16 October 2026. Your sportsbook’s own rules decide your bet.
NFL and college football. Points arrive mostly in 3s, 6s, 7s and 8s, so final combined scores scatter widely. In the 2025 NFL regular season the most common combined score was 44, and it happened in only 12 of 270 games (4.4%). Full-game totals include overtime at both books, which can turn an under that was safe at the end of regulation into a loser.
NBA and college basketball. Totals sit in the 200s in the NBA: the 2025-26 lines ran from 207.5 to 254.5, and 233.5 was the most common. Overtime counts toward the full-game total at both books, and each NBA overtime period adds five more minutes of scoring to a game the total was set for without it.
MLB. Totals are low and bunched: 8.5 was the most common line in 2026 (525 games), then 8 (491), 7.5 (420) and 9 (365). The rule to check is what happens when a game is cut short. Pinnacle needs 9 innings, or 8.5 if the home team is winning, for a full-game total to stand. Circa grades full-game totals once a game is official after 5 innings (4.5 if the home team leads). The same rained-out game can be a graded bet at one book and a refund at the other.
NHL. Nearly every NHL total is 5.5 or 6.5: 1,308 of the 1,309 lines in 2025-26, with a single 7.5. Overtime counts, and if a game goes to a shootout, both books add one goal to the winning team’s score. A 2-2 game decided in a shootout goes down as 3-2, a total of 5.
Soccer. The usual line is 2.5 goals: 199 of the 250 Premier League totals in 2025-26 were set there, and the season’s 380 games averaged 2.75 goals (1,045 in all). Both books settle on 90 minutes plus stoppage time. Extra time and penalty shootouts do not count, even in a knockout game that needs them.
Alternate totals, team totals and first-half totals
Alternate totals are the same bet on a different number. A book lists extra lines above and below the main total, each with its own price: a lower over or a higher under costs more, and a line further from the main one pays more. Our guide to alternate total points works through a full ladder and its break-even rates, and our guide to alternate spreads does the same for the spread.
Team totals count one team’s points only. The spread and the total give you a rough read of where they start. With a game total of 47.5 and a favorite at -3.5 (an example), the two numbers together point to about 25.5 points for the favorite and 22 for the underdog: add the spread to the total and halve it, then subtract. A book’s team totals are priced on their own, so compare its numbers with that sum before betting one. The point spread guide explains how the spread is read.
First-half totals count only the points scored before halftime, and in hockey the first period has its own total too. Overtime never counts toward a first-half total, and Circa’s rules need the half to be played in full for the bet to stand. In baseball the matching market is the first five innings, which Pinnacle’s rules treat as baseball’s first half.
Over or under: which side to bet
Neither side wins on its own. Across the five leagues in the table, overs won 2,708 games and unders won 2,672, and no league finished far from even. A rule of thumb that says “always bet the under” or “always bet the over” pays the 4.55% margin on every bet and gets nothing back for it.
What matters is whether your own estimate of the combined score differs from the book’s number by enough to beat the price. At -110 you need to be right on 52.38% of your bets to break even, and at -115 you need 53.49%. If your read of a game does not clear that bar, the moneyline or the spread may suit the view better, or the best bet is none.