Baseball Bat Size Calculator

How it works

Height (rounded to the inch) → length from the standard sizing chart · bat weight (oz) = length (in) − drop · drop by age: 4–6 −10 to −14, 7–12 −10 to −13, 13–15 −3 to −7, high school and up −3 (BBCOR)

Bat length is mainly chosen by height (weight shifts it by an inch at most), using the sizing chart published by bat retailers and leagues. The drop is length in inches minus weight in ounces: a 30″ −10 bat weighs 20 oz. Younger players use bigger drops (lighter bats); US high-school and college rules require BBCOR bats with a drop of no more than −3. To check the fit, stand the bat beside the leg — the knob should reach the middle of the palm with the arm hanging down — and the player should hold it straight out to the side for 10 seconds without the barrel dropping.

Worked example

A 10-year-old who is 140 cm tall: 140 ÷ 2.54 = 55.1 in → 55 in, which is 4′7″ in the 4′5″–4′8″ row, so the recommended length is 29–30″ (74–76 cm). Little League age, drop −10 to −13, so the bat should weigh 16–20 oz (454–567 g).

Sources: Baseball Monkey — Baseball bat buying guide (sizing chart) · Little League — Bat information

Frequently asked questions