Baseball bat size chart and calculator
The right bat is the longest one you can still swing quickly and level. Enter your height and weight below for a starting length, then use the drop and certification charts to pick a bat that is legal in your league.
By World Baseball News · Updated October 2026Bat size calculator
Bat length by age and height
| Age | Height | Bat length | Typical drop |
|---|---|---|---|
| 5 to 7 | 3'0" to 4'0" (91 to 122 cm) | 24" to 26" | -11 to -13 |
| 8 to 10 | 4'0" to 4'8" (122 to 142 cm) | 26" to 29" | -10 to -12 |
| 11 to 12 | 4'8" to 5'2" (142 to 157 cm) | 29" to 31" | -8 to -10 |
| 13 to 14 | 5'0" to 5'8" (152 to 173 cm) | 30" to 32" | -5 to -8 |
| 15 and up | 5'6" and taller (168 cm+) | 32" to 34" | -3 (BBCOR or wood) |
Use the chart as a starting point. Strength, hand size and personal feel matter as much as age.
Which bat certification your league needs
| Stamp | Used in | Drops | What it means |
|---|---|---|---|
| BBCOR | US high school (NFHS) and college (NCAA) | -3 only | Performs close to wood. Required for high school and college play. |
| USSSA (1.15 BPF) | Travel ball and most youth tournaments | -5 to -13 | The most lively youth standard. |
| USA Baseball | Little League, Babe Ruth, PONY, AABC | -5 to -13 | Performs closer to wood than USSSA bats. |
| Wood | Every league, pro baseball, most European senior leagues | usually -3 | Always legal. Maple, birch or ash. |
How to choose the right bat size
- Start with heightHeight decides most of the length: a taller hitter has longer arms and covers more of the plate. The calculator uses the age and height chart above as its base.
- Adjust for weight and strengthA strong, heavier player can handle an inch more; a lighter player is usually quicker with an inch less. Swing speed matters more than the number on the barrel.
- Pick the dropDrop is length minus weight in ounces: a 30-inch, 20-ounce bat is a -10. A bigger drop (-10 to -13) is lighter and easier to swing; -3 is the heaviest and is required for BBCOR.
- Check the stampThe certification stamp on the barrel decides where the bat is legal. A bat with the wrong stamp cannot be used in games, however well it fits.
- Test itHold the bat by the handle with your arm straight out to the side. If you cannot keep it level for about 10 seconds, it is too heavy. Standing it next to your leg, the knob should reach the middle of your palm.
Frequently asked questions
What size bat should I use?
Use your height as the starting point: roughly 24 to 26 inches at 3 to 4 feet tall, 29 to 31 inches around 5 feet, and 32 to 34 inches for players 5'6" and taller. Move up or down an inch based on strength and how quickly you can swing it.
What does drop weight mean?
Drop is the bat's length in inches minus its weight in ounces. A 31-inch bat that weighs 21 ounces is a drop 10 (-10). The bigger the drop, the lighter the bat feels.
What size bat does an adult need?
Most adult players use a 32 to 34 inch bat with a -3 drop, in wood or BBCOR. Many pros swing 33 to 34 inches.
Is it better to have a bat that is too long or too short?
Too short is the smaller problem. A bat that is too long or heavy slows the swing, drops the barrel and makes it hard to catch up to fastballs. When in doubt, choose the shorter or lighter option.
Which bat do I need for baseball in Europe?
Most senior leagues in Europe play with wood or BBCOR-certified bats. Youth rules vary by country and federation, so check with your club or national federation before buying.
How do I measure for a baseball bat without a calculator?
Stand the bat upright next to your leg: the knob should reach your palm with your arm hanging straight. Or hold it across your chest pointing toward your outstretched arm: your fingertips should just reach the end of the barrel.