● MLB BETTING GUIDE · BY MARCDUCK

How to Bet the MLB Moneyline

Published May 8, 2026 · Updated October 3, 2026

The moneyline is the simplest MLB bet, pick the winner. But pricing varies hugely with favorite size. Here's how it works, when it has value, and how to read the implied probabilities.

What is a Moneyline?

The moneyline is the simplest bet in MLB: pick which team wins, no spread, no total. Odds are expressed in American format. A -150 price means you bet $150 to win $100 (favorite). A +135 price means you bet $100 to win $135 (underdog). The bigger the favorite, the more juice you pay.

Reading the Numbers

Odds map to implied probability. A team at -150 implies a market belief of about 60% they win (calculation: 150 / (150+100) = 0.60). A team at +150 implies about 40%. Both numbers include vig, so the true "fair" probability is slightly different, typically the favorite's implied probability is inflated by ~2-3 percentage points to cover the book's cut.

When Moneyline Has Value

Moneyline value usually shows up on:

Plus-money underdogs with real upset equity. If your model thinks the dog wins 45% but the market prices them at +160 (implied 38%), that's a +EV bet, even though they'll still lose more often than they win.
Heavy favorites where you'd take the run line instead. A team at -240 implied 70% to win is rarely +EV on the moneyline directly. The run line at -1.5 ±100 is usually better value if you genuinely think they win by 2+.
Pitcher mismatches that move slowly. Probable starters announced late often produce moneyline mispricings the model catches before the line steam.

How Bookie Bullies Picks Moneylines

Our model produces a probability for every side and blends it with the market price, a Statcast ensemble, and a line-history price, shifting more weight to the market when model and market disagree. It then computes EV against the posted price. The displayed pick is the side with the higher blended win probability. A moneyline is recommended only at 3+ stars with at least 3% EV; every other game stays on the card as a read.

Quick Reference: Implied Probability

-300 → ~75% implied · +250 → ~28%
-200 → ~67% implied · +170 → ~37%
-150 → ~60% implied · +130 → ~43%
-110 → ~52% implied · -110 → ~52% (pick'em, vig only)
+110 → ~48% implied · +110 → ~48%

What Are the Steps?

Read the odds. American moneyline odds show you the price for each side. Negative numbers (-150) are favorites and tell you how much to bet to win $100. Positive numbers (+135) are underdogs and tell you how much you win on a $100 bet.
Convert to implied probability. For favorites: probability = abs(odds) / (abs(odds) + 100). For underdogs: probability = 100 / (odds + 100). At -150 the favorite is implied 60%; at +135 the dog is implied 42.6%. Both include the book's vig.
De-vig the line. Add both sides' implied probabilities, they'll sum to over 100% (typical: 104.8% for a -110/-110 market). Divide each side by the total to get the fair no-vig probability.
Compare to your probability estimate. If your model's probability exceeds the no-vig market probability, the bet has edge. The bigger the gap, the bigger the edge. Bookie Bullies' picks already do this comparison and display EV%.
Size the stake with Kelly. Compute Kelly fraction: f = (prob × decimal_odds - 1) / (decimal_odds - 1). Then divide by 8 for 1/8-Kelly. A 60% prob at -110 (decimal 1.909) gives f = 0.16, so 1/8-Kelly = 2% of bankroll.

Frequently Asked Questions

What does -150 on the moneyline mean?

A -150 moneyline means you bet $150 to win $100 (or any proportional amount, like $30 to win $20). It's a favorite price. Implied win probability: 150 / (150+100) = 60%. The team is favored to win 60% of the time at fair odds, slightly less after removing the book's vig.

What does +135 on the moneyline mean?

A +135 moneyline means you bet $100 to win $135 (or any proportional amount). It's an underdog price. Implied win probability: 100 / (100+135) = 42.6%. The team is the underdog. Plus-money dogs with real upset equity are where most moneyline value lives.

How do you convert MLB moneyline odds to probability?

For negative odds (favorites): probability = -odds / (-odds + 100). For positive odds (underdogs): probability = 100 / (odds + 100). Example: -150 → 60%, +135 → 42.6%. Both include vig, so true fair probabilities are slightly different.

When does Bookie Bullies pick the moneyline vs the run line?

Bookie Bullies stopped publishing run line picks in September 2026, so every full-game side we show is a moneyline read, on the side with the higher blended win probability. Heavy favorites often have better value on the run line (-1.5) than the moneyline, so compare both prices at your book.