Baseball and softball bat size guide

A bat has three numbers that matter: length, drop, and the certification stamp on the barrel. Length and drop are about the player. The stamp is about the league, and it can make a perfectly sized bat illegal on game day.

Start with length

Length is the first decision and the one that affects the swing most. Louisville Slugger puts it directly: find the correct length first, then adjust the weight drop if necessary. Most shops start from height and weight. Easton's chart, as published by Scheels, reads a player's weight down one side and height across the top. A 12-year-old who is 5 feet tall and 100 pounds lands in the 57 to 60 inch column and the 91 to 100 pound row, which gives a 31 inch bat. Our baseball bat size chart has the whole grid and a calculator.

Age is the rougher shortcut. Louisville Slugger's most popular lengths by age run like this:

The Easton and Scheels age tables agree for most ages and differ at the ends: Easton gives 24 to 26 inches for 7 and under, and 34 inches for 17 and up, where Scheels says 33 to 34 for adults. A tall 10-year-old and a small 12-year-old can sit two or more inches apart on the same age row, which is why height and weight win over age.

If you have no chart, a few quick checks work. BaseballMonkey's softball guide has three: hold an arm straight out and measure from the center of the chest to the fingertips; stand the bat by the knob at your side and see whether the barrel reaches the floor; or put the knob at the center of the chest, extend the bat, and see whether you can grab the barrel. They are rough. They are useful for catching a bat that is clearly too long.

What drop means and how to calculate it

Drop is length in inches minus weight in ounces. Scheels' example: a 28 inch bat that weighs 18 ounces is a drop -10. A bigger negative number means a lighter bat. JustBats says most youth bats sit between -10 and -13.5.

Work it through for a 31 inch bat. At -10 it weighs 21 ounces. At -8 it weighs 23. At -5 it weighs 26. Those two extra ounces between -10 and -8 are small on a scale and obvious at the plate, because the weight sits out in the barrel.

Louisville Slugger gives an example worth remembering. A 30 inch, -10 bat weighing 20 ounces swings heavier than a 29 inch, -8 bat weighing 21 ounces. The longer bat is a full ounce lighter on the label and still feels heavier. Length drives swing weight more than the weight number does, so a drop that looks light on a bat that is too long will not rescue the swing.

One test passed around retail guides, including The National Pastime Museum's USA bat guide, is to hold the bat out level in one hand. If the player cannot keep it level for 20 to 30 seconds, it is too heavy. It is a decent tie-breaker and nothing more.

When you land between two lengths

Charts have hard edges. A player at 90 pounds and 5 feet tall gets a 30 inch bat on the Easton grid; at 91 pounds the same row says 31. Three ways to settle it:

• Check the age row. At 11 or 12 both Easton and Scheels say 30 to 31 inches, so either answer is inside the range.
• Pick the length the player can swing without the barrel dropping or the hands sliding up the handle. Then, if the bat feels heavy, move to a lighter drop at the same length, which is the order Louisville Slugger recommends.
• Look at the season, not the week. Easton and Scheels charts are guidelines. A player who is growing quickly may be better served by the longer size in the second half of a season, but only if the swing still looks controlled.

Certification: the part that decides legality

Every league names the standards it accepts, and the bat must carry that mark permanently on the barrel or taper. A sticker does not count. The main baseball standards:

USA Baseball says the USABat standard exists so that non-wood youth bats perform like wood. Retail sales began September 1, 2017 and the standard took effect January 1, 2018. USA Baseball also lists the next changes. USABat -4, -5 and -6 bats are permitted for high school play beginning with the 2028 season. College play allows BBCOR .50 bats through the 2027 and 2028 seasons, and from January 1, 2029 only the new USA BBCOR mark is permitted. If the player is a high school freshman or a travel player aiming at college, check the current year before buying.

USSSA is separate. JustBats notes that USSSA will not adopt the USABat standard, though it accepts USABat-stamped bats when barrel diameter, drop and material fit the division. The reverse does not hold: a USSSA-only bat is not legal in a league that follows USABat.

Little League publishes its own limits (page updated July 7, 2026). Tee Ball bats must be 26 inches or shorter and carry the words "ONLY FOR USE WITH APPROVED TEE BALLS." Minor and Major division bats can be up to 33 inches and 2 5/8 inches around, Intermediate and Junior League up to 34, Senior League up to 36. Only Senior League has a length-to-weight rule: the bat cannot weigh numerically more than 3 ounces less than its length, so a 33 inch bat cannot weigh under 30 ounces. BBCOR is allowed in Intermediate and Junior and required for non-wood bats in Senior.

Softball bats

Fastpitch bats have a 2 1/4 inch barrel. Little League caps softball barrels at 2 1/4 inches and bats at 33 inches, or 34 for Junior and Senior League. AXE Bat puts typical fastpitch bats at 28 to 34 inches with drops from -8 to -12, and adult fastpitch usually 32 to 34 inches. JustBats lists -11 to -13 for ages 4 to 6, -10 to -12 for 7 to 11, -10 and -11 for 12 to 14, and -8 to -10 from 15 up. Our softball bat size chart works from height and weight in the same way as the baseball chart.

Fastpitch stamps are different from baseball ones. CheapBats lists USA Softball (formerly ASA), which caps batted-ball exit speed at 98 mph, and USSSA fastpitch, which uses a BPF at or below 1.20. High school softball under NFHS requires a bat bearing the ASA 2000, 2004 or USA Softball All-Games mark that is not on USA Softball's non-approved list. A mark alone does not settle it: a bat with a valid mark is out only if its exact model number is on that list. Look the model up on usasoftball.com under Certified Equipment before you pay.

Slowpitch is another matter. Its bats and certifications are different, and the charts on this site cover fastpitch only.

Care that affects the bat you bought

Louisville Slugger warns that composite bats may lose performance or crack below 60°F and should be stored indoors, not in a car. Little League also prohibits altered bats, and pine tar is allowed only on the handle or grip, never on the barrel or over the required marks.

Related tools

Baseball bat size chartLength from height and weight Softball bat size chartFastpitch length and drop Baseball glove size chartSize by age and position