There’s a lot to learn when it comes to betting on MLB odds, from moneylines to run lines to totals. Plus, the odds are always changing due to so many factors outside of just the game. But, once you learn how to read MLB odds you’ll be able to identify value, compare prices, and make informed wagers.
Baseball betting is heavily influenced by things like pitching matchups, bullpen usage, lineup changes, and even weather conditions, which creates a market that’s constantly changing. This also means, though, that opportunities pop up for bettors who understand how to read the board.
Here’s how the main MLB betting markets work and how to interpret the numbers you see at sportsbooks like Circa Sports.
Understanding American Odds
Most MLB sportsbooks in the United States use American odds, which are displayed with either a plus or minus sign.
A minus sign indicates the favorite. A plus sign indicates the underdog. For example, if a sportsbook shows “Los Angeles Dodgers -180” and “San Diego Padres +155,” the Dodgers are favored to win the game, while the Padres are the underdog.
How Minus Odds Work
Negative odds show how much you need to risk to win $100 in profit. So if the Dodgers are -180, you would need to bet $180 to win $100
Favorites are generally expected to win, which is why payouts are smaller.
How Plus Odds Work
Positive odds show how much profit you would win on a $100 wager. If the Padres are +155, a $100 bet would win $155.
Underdogs pay more because they are considered less likely to win the game.
What Is Implied Probability?
Implied probability converts betting odds into an estimated chance of winning, which helps bettors determine whether they believe a line offers value.
For example, -200 implies about a 66.7% chance of winning while +150 implies about a 40% chance of winning.
Sportsbooks build these probabilities into the market based on team strength, pitching matchups, injuries, betting action, and other factors.
If you believe an underdog has a better chance of winning than the odds suggest, you may have found betting value.
The Three Main Types of MLB Bets
There are 3 main types of MLB bets: moneyline bets, run line bets, and totals.
Moneyline Bets
Moneyline betting is the most common MLB wager. You are simply betting on which team will win the game.
Because baseball games are often low-scoring and highly variable, underdogs win more frequently than in many other sports, which makes MLB moneyline betting especially popular. In a game of baseball, realistically anything can happen.
Run Line Bets
The MLB version of a point spread is called the run line. The standard run line is usually set at 1.5 runs.
Example:
- Braves -1.5 (+120)
- Mets +1.5 (-140)
If you bet the Braves -1.5, they must win by at least two runs. If they only win by one run, your bet loses.
If you bet the Mets +1.5, they can either win the game outright or lose by exactly one run.
Because many MLB games are decided by one run, run line betting creates a different level of risk and reward compared to moneylines.
Totals (Over/Under Bets)
Over/under betting focuses on the combined number of runs scored by both teams.
Example:
- Over 8.5 (-110)
- Under 8.5 (-110)
In this case, if the final score is 6-4, the total runs equal 10 and the over wins and if the final score is 4-3, the total runs equal 7 and the under wins.
Totals are heavily influenced by:
- Starting pitcher quality
- Bullpen availability
- Ballpark conditions
- Weather and wind
- Offensive matchups
- Umpire tendencies
For example, a game at Coors Field in Colorado, where hitting home runs is easier than at other parks.
MLB Odds Examples
Let’s look at some MLB odds examples as of May 2026:
Cardinals vs. Brewers: Wednesday, May 27 at 10:40AM
In this matchup, the Milwaukee Brewers are listed as the favorite at -180 on the moneyline, while the St. Louis Cardinals are the underdog at +148.
That means:
- A bettor would need to risk $180 on the Brewers to win $100 in profit.
- A $100 wager on the Cardinals would return $148 in profit if St. Louis wins outright.
The run line is set at Brewers -1.5 (+119) and Cardinals +1.5 (-143).
If you bet Milwaukee on the run line, the Brewers must win by at least two runs for the bet to cash. Because covering the extra run is harder, the payout increases to plus money. A $100 bet would win $119.
Meanwhile, Cardinals +1.5 means St. Louis can either win the game outright or lose by exactly one run. Because that added cushion is valuable in baseball, bettors must lay -143 odds.
The total for the game is sitting around 8 runs, meaning sportsbooks expect a moderate-scoring matchup between pitchers Dustin May and Chad Patrick. Bettors taking the over need at least nine combined runs, while under bettors are wagering on a lower-scoring game.
Phillies vs. Padres: Wednesday, May 27th at 1:10PM
For this game, philadelphia is priced around -148 on the moneyline, while the Padres are +123 underdogs.
That means:
- A $148 bet on the Phillies would win $100.
- A $100 bet on San Diego would profit $123 if the Padres pull off the upset.
The total is set at 7 runs, which is relatively low by MLB standards and signals that sportsbooks expect strong pitching or limited offense in this matchup.
On the run line, the Phillies are -1.5 (+114), meaning they must win by at least two runs. The Padres +1.5 (-137) allows San Diego to either win outright or lose by a single run.
This is a good example of how starting pitchers heavily influence MLB odds. Sanchez’s strong season numbers help make Philadelphia the favorite, while the low total reflects expectations for a tighter, lower-scoring game.
Rockies vs. Dodgers: Wednesday, May 27th at 7:10PM
The Los Angeles Dodgers are one of the biggest favorites on the board at -424 against the Colorado Rockies.
At those odds:
- A bettor would need to risk $424 to win $100 on the Dodgers.
- A $100 bet on Colorado would win $324 if the Rockies pull off a major upset.
The large price difference reflects both the talent gap between the teams and the pitching matchup, with Shohei Ohtani entering at 4-2 with a microscopic 0.73 ERA.
The run line is Dodgers -1.5 (-173), meaning Los Angeles must win by at least two runs. Even with the extra run attached, sportsbooks expect the Dodgers to win comfortably.
Colorado +1.5 (+143) is unusual because bettors are still getting plus money even with the extra run cushion. That shows just how heavily favored Los Angeles is in this matchup.
The total is set at 8 runs, suggesting sportsbooks still expect some scoring despite Ohtani’s dominance, likely because of the Dodgers’ powerful offense and the volatility that can come with Rockies games.
What Causes MLB Odds to Move?
MLB odds are constantly moving. Lines can shift throughout the day as sportsbooks react to new information and betting volume. Here are some of the factors that can impact betting the most.
Starting Pitchers
Starting pitchers are the single biggest influence on MLB odds.
If an ace like Jacob Misiorowski or Dylan Cease is announced as a starter, sportsbooks may immediately move the line significantly toward that team.
If a pitcher is scratched close to first pitch, odds can swing dramatically within minutes.
Bullpen Usage
Bullpen fatigue matters much more in baseball than many casual bettors might realize.
If a team used several key relievers heavily the previous night, sportsbooks may slightly adjust the odds because their late-game pitching depth may be weaker
Injuries and Rest Days
A lineup missing a star hitter can impact both moneylines and totals.
For example, if a power hitter is resting during a day game after a night game, sportsbooks may lower the projected run total.
Betting Action and Line Movement
Sportsbooks also move odds based on betting patterns.
If large amounts of money come in on one team, the line may shift to balance risk.
For example the Cubs might open at -120, but heavy betting pushes them to -145. Bettors who grabbed the earlier number now hold a more favorable price than late bettors.
These changes are why many experienced bettors compare odds across sportsbooks and monitor line movement throughout the day.
Why Shopping for MLB Odds Matters
Even small pricing differences can impact profitability over the course of a long baseball season.
For example, one sportsbook might offer +120 while another offers +130. That difference may seem small on a single bet, but over hundreds of wagers, consistently getting better prices can significantly improve long-term returns.
Bet MLB at Circa Sports
Understanding MLB odds is the first step toward becoming a more informed baseball bettor. Once you know how moneylines, run lines, totals, and implied probability work, it becomes much easier to evaluate matchups and identify potential value throughout the season.
The Circa | Sports® App gives bettors access to competitive MLB odds, flexible betting options, and a premium sports betting experience 24/7. Download the app today to get started!