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Total Bases Props
The hitter market that rewards power, not just contact — how bases are counted, and why the number is lumpier than it looks.
A total bases prop is an over/under on the bases a hitter records in a game, like Total Bases 1.5. Bases are weighted by how far the hitter gets: a single is 1, a double 2, a triple 3, and a home run 4. A walk is worth zero — this is a contact-and-power market, not an on-base one.
How the count works
Add up the bases from each hit. A player who hits a single and a double has 3 total bases; one home run is 4 on its own. That weighting is what separates this from a hits prop: total bases pays for the quality of contact, so sluggers carry far higher lines than slap hitters with the same batting average.
What drives the projection
- Power & contact quality — extra-base-hit rate, blended season and recent form.
- Playing time — expected plate appearances, which track the hitter’s lineup spot.
- The matchup — the opposing probable starter’s contact/hard-hit profile.
- Ballpark — some parks turn warning-track outs into doubles and homers. See ballpark factors.
Our projection model builds a per-plate-appearance rate, scales it by expected playing time, then adjusts for the opponent and park — so the number on the total bases page is matchup-aware.
Mind the lumpiness
Total bases has fat tails: because a homer is worth 4, a single swing can blow past an Over that a string of singles never reaches. That means the spread of outcomes is wider than a plain count would suggest, and a naive model is over-confidenton the middle numbers. We price total bases with a wider distribution to respect that — it’s the prop where accounting for the tails matters most.
Reading the matchup
The cleanest Over is a power hitter, batting near the top of the order (more plate appearances), against a contact-prone starter in a hitter-friendly park. The trap is a slugger facing an elite arm in a pitcher’s park, or one who’s dropped in the lineup and will see one fewer trip to the plate.
Finding value
When our projection diverges from the posted line, the gap — judged against the price — is the edge. The MLB edge board ranks total bases by expected value, not the raw gap, and pairs well with no-vig fair odds to judge whether the price is worth it. Check the hitter’s game log, hit rate at the line, and home/away splits on the prop page, and size bets with bankroll management in mind — see also variance and sample size.
Frequently asked
What is a total bases prop?
It's an over/under on how many total bases a hitter records in a game. A single is 1 base, a double 2, a triple 3, and a home run 4 — so a player who singles and doubles has 3 total bases. A typical line is Total Bases 1.5.
What drives a total bases projection?
Power and playing time first: how hard and how often the hitter makes extra-base contact, and how many plate appearances they'll get (lineup spot matters). Then the matchup — the opposing starter and the ballpark — nudges it up or down.
Why is total bases harder to price than hits?
Because the outcome is lumpy. One home run is 4 bases, so a single swing can clear an Over by itself, which fattens the tails of the distribution far beyond a simple count. A model that ignores that overstates how often middling numbers land.