Calculate total bases from each hit type, see how the bases are distributed, or find the whole total-base count needed for a target slugging percentage.
Total Bases Formula
Total bases, abbreviated TB, count the bases a batter earns directly from hits. A single is worth one, a double two, a triple three, and a home run four:
The formula describes hit value more fully than a simple hit count. Two batters can record the same number of hits while producing very different total-base totals.
What Does Not Count as a Total Base?
Total bases come only from the hit that placed the batter on base. A walk does not add a total base. Neither does a stolen base, advancement on an error, a fielder’s choice, or moving up because of another player’s hit.
Total Bases and Slugging Percentage
Total bases are the numerator of slugging percentage:
Target mode reverses that relationship. It multiplies the target SLG by at-bats and rounds upward to the minimum whole total-base count that meets the target.
Example
A hitter with 30 singles, 10 doubles, 2 triples, and 8 home runs earns 30 bases from singles, 20 from doubles, 6 from triples, and 32 from home runs. The total is 88 bases. Across 200 at-bats, that also produces a .440 slugging percentage.
Reading the Breakdown
- Total hits equal singles plus doubles plus triples plus home runs.
- Extra-base hits are doubles, triples, and home runs.
- Extra bases beyond one per hit equal doubles plus twice triples plus three times home runs.
- A target total-base count can come from many different hit combinations.
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Sources
Major League Baseball. MLB Glossary: Total Bases (TB), current edition.
Major League Baseball. Official statistical formula for slugging percentage, current edition.
