How Do Over/Under Bets Work? A Complete Totals Guide
Forget picking the winner — just call how many runs get scored
The rule in one sentence
The book posts a "total line," and you bet whether the two teams' combined score will finish above it (Over) or below it (Under). It has nothing to do with who wins or loses.
Soccer commonly uses 2.5: 3 or more goals goes Over, 2 or fewer goes Under.
Half-point lines vs. whole-number lines
A half-point line like 8.5 always produces a clear Over or Under; on a whole-number line of 8, a total of exactly 8 is a push and your stake is refunded. Some books post quarter lines like 7.5/8, which is like putting half your bet on 7.5 and half on 8 — so you can "win half." Taiwan Sports Lottery follows its official rules, so check the line's format carefully before you bet.
Does overtime count?
Under the mainstream rules (including Taiwan Sports Lottery), totals include overtime: extra innings in MLB and extra time in soccer (when the market states it includes extra time) all count toward the total. The calculation window can differ between markets on the same game — this is the trap beginners fall into most often.
Key points for reading totals
Totals are far more sensitive to "environmental factors" than the spread: in MLB, look at the starting pitcher's ability to suppress runs, the state of the bullpen, park factors (Coors Field in Denver clearly inflates totals), and wind; in soccer, look at each side's attacking and defensive tempo and their intent (knockout games often open cautiously). Radar's model analysis uses a dual-Poisson / negative-binomial simulation to give the quantified probability P(Over) directly, and lists the most likely score combinations.
Frequently Asked Questions
Do Over/Under bets include overtime?
Under the mainstream rules (including most Taiwan Sports Lottery markets), overtime and extra time count, and the total is based on the final score. The calculation window can differ between markets on the same game, so confirm the market's terms before you bet.
What's the difference between a total of 8 and 8.5?
8.5 always produces a clear win or loss; on a whole-number line of 8, a total of exactly 8 is a push and your stake is refunded.
What data should I look at for Over/Under?
In MLB, look at the starting pitcher, the bullpen, and park factors; in soccer, look at each side's average goals scored and conceded and the pace of play. The quantitative approach is to run a score-distribution model to get P(Over) and then compare it against the odds' implied probability.