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Baseball Left on Base Percentage (LOB%) Calculator

LOB Calculator

79.75%

What is LOB%?

LOB% is a baseball metric that attempts to show how many runners a pitcher usually leaves on base.
The metric attempts to create the result from box score information as opposed to being an actual tally of the number of baserunners left at the end of the inning.
Some statiscians have noted that most pitchers have a LOB% that tends to regress to the low 70% over time.

How to calculate LOB%

In Baseball, on LOB% is calculated as:
LOB% = (Hits + Walks + Hit by Pitch – Runs) / (Hits + Walks + Hit by Pitch – (1.4 x Home Runs))

Example

If a pitcher has allowed 190 hits, 43 walks, hit 3 batters, allowed 69 runs, and 19 home runs, then:
LOB% = (190 + 43 + 3 – 69) / (190 + 43 + 3 – (1.4 x 19))
LOB% = 167 / (190 + 43 + 3 – 26.6)
LOB% = 167 / 209.4
LOB% = 0.7975
This pitcher’s LOB% is 0.7975, or 79.75%. 79.75% of runners on base are left on base at the end of the inning when facing this pitcher.

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