Baseball Bat Sizes, Drop Weight and BBCOR vs USSSA
Choose bat length by age, height and weight, then the drop (length minus weight) and the certification stamp your league requires, such as USA, USSSA or BBCOR.
By Adolph GreenContributing writer.
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The short answer
A bat is described by three things: its length in inches, its drop and its certification. Start with the certification your league requires, pick a length from the player's age, height and weight, then choose a drop the player can swing with control.
What size baseball bat do I need
Rawlings publishes this general guide by age:
| Age | Bat length |
|---|---|
| 5 to 7 | 24 to 26 in |
| 8 to 9 | 26 to 28 in |
| 10 | 28 to 29 in |
| 11 to 12 | 30 to 31 in |
| 13 to 14 | 31 to 32 in |
| 15 to 16 | 32 to 33 in |
| 17 and older | 34 in |
Rawlings also publishes a chart by height and weight, which is worth checking when a player is tall or heavy for their age. Its sizing guide adds that players who have reached 5 feet can look at 30 and 31 inch bats, and players 5 feet 5 inches and taller can start considering 32 inches.
Rawlings notes that a bat that is too long or heavy costs power and consistency, while one that is too short or light makes plate coverage harder. If you can, let the player swing a few sizes.
What does drop weight mean on a bat
Drop is the bat's length in inches minus its weight in ounces, written as a negative number. A 30 inch bat that weighs 20 ounces is a drop 10 (-10). The bigger the number after the minus sign, the lighter the bat for its length.
According to Rawlings:
- USA bats range from -13 to -5.
- USSSA bats range from -10 to -5.
- BBCOR bats are always -3.
- Players under 11 generally use -10 or lighter; older players can often move to -8 or -5.
Rawlings stresses there is no correct drop for an age. A bat that is too light can also throw off swing mechanics, so strength and skill decide.
BBCOR vs USSSA bat
| Stamp | Who uses it | Barrel | Performance rule |
|---|---|---|---|
| USA | Leagues for age 13 and under, such as Little League, Babe Ruth, Cal Ripken and PONY | 2 5/8 in | Lowest pop, usually lightest |
| USSSA | Travel and tournament ball before high school | 2 5/8 or 2 3/4 in | BPF of 1.15 |
| BBCOR | High school and college | 2 5/8 in | BBCOR rating under .50, drop 3 |
BBCOR stands for Batted Ball Coefficient of Restitution. Rawlings explains the .50 limit this way: a ball thrown at 100 mph at a still bat would bounce back at no more than 50 mph. That limit is stricter than USSSA's 1.15 BPF, so USSSA bats usually have more pop. BBCOR bats come in lengths from 29 to 34 inches.
A bat stamped for one association is not automatically legal in another. Check your league rules before buying. Softball bats (fastpitch and slowpitch) follow their own rules; the charts above are for baseball.
How we count
Lengths, drops and certification rules come from Rawlings' sizing chart and bat sizing guide. A read-only query of our listing data on October 26, 2026 found 133 bats in the sports and outdoors department on Wiki Shopping, including 27 fastpitch and 8 slowpitch softball bats. The counts change as listings are added or removed.