How MLB Betting Works — Moneylines, Run Lines & Totals Explained

MLB betting comes down to three core wager types — the moneyline, the run line, and the game total — and understanding what each number means is the fastest way to move from confused spectator to informed bettor. Once you know how the lines work, you can dive into our MLB Betting Strategy hub for reading lines and picking smarter with a much clearer head.

What Is the Moneyline in Baseball Betting?

The moneyline is a straight bet on which team wins the game outright, no spread involved. Odds are displayed in American format: a negative number shows the favorite, a positive number shows the underdog. For example, -150 means you must wager $150 to profit $100, while +130 means a $100 bet returns $130 in profit. In a competitive MLB matchup, each side is typically priced somewhere between -130 and +120. For a deeper breakdown of what those numbers actually mean, see our guide on reading MLB odds in plain English.

How Does the Run Line Work?

The run line is baseball's version of a point spread, but it is almost always fixed at -1.5 runs for the favorite and +1.5 runs for the underdog. If you back the favorite on the run line, they must win by two or more runs. Back the underdog and they can lose by one run and your ticket still cashes. Because you are giving up a run and a half with the favorite, the odds on that side lengthen — meaning a team priced at -160 on the moneyline might be closer to -110 on the run line. Our full breakdown of how the MLB run line's -1.5 and +1.5 work walks through every scenario in detail.

What Are MLB Game Totals (Over/Under)?

A game total, or Over/Under, asks you to predict whether the combined runs scored by both teams will exceed or fall short of a number set by the sportsbook. For the 2025 season, totals are typically posted between 7.5 and 9.5 runs. Bet the Over and you need the offenses to combine for the posted number plus one; bet the Under and you need a pitching-dominated, low-scoring game.

What Is the Vig and Why Does It Matter?

Every bet carries a built-in commission called the vig or juice. A standard -110 line on both sides of a total means you bet $110 to win $100 — that gap is how the sportsbook earns its margin, generating a house edge of roughly 4.55%. A -115 / -105 split market lowers that edge to about 3.2%. Shopping for the best number across books is one of the simplest ways to reduce what you give back to the house over time. For more on how the vig compounds, visit our page on juice, vig, and the house edge in MLB betting.

How Do Prop Bets Fit In?

Beyond the three core bet types, sportsbooks offer prop bets on individual player or in-game outcomes — whether a specific slugger hits a home run, how many strikeouts a starter records, and so on. Props add variety to a slate but can carry wider vig than standard markets. Browse today's MLB prop picks including home run and strikeout selections to see how we apply these ideas in practice.

Where Can You Place These Bets Legally?

Online sports betting is legal in approximately 38 states as of 2025, including NJ, NY, PA, IL, CO, MI, AZ, and NC (which launched in March 2024); TX, CA, GA, and FL (contested) have not yet legalized online wagering. Licensed sportsbooks accepting MLB wagers include DraftKings, FanDuel, BetMGM, Caesars Sportsbook, ESPN Bet, and others. Our state-by-state MLB betting legality guide lists every active market, and our comparison of the best MLB sportsbooks covers DraftKings, FanDuel, BetMGM, and more.

Must be 21+ (18+ in NH and WY). Gambling problem? Call 1-800-GAMBLER.

Once you have the basics locked in, head to our daily MLB best bets, props, and parlays to see how we translate these concepts into same-day selections.