Bat Sizing

Bat Chart*

Success at the plate often comes down to this: making consistent hard contact against live pitching. To do this, it’s important to swing the right bat for you. That means a bat that’s long enough to cover the strike zone, light enough to swing with ease, heavy enough to generate power, and, of course, permitted in your league. In order to find the ideal size for you, consider the following guidelines:

Weight Height
3' - 3' 4" 3' 5" - 3' 8" 3' 9" - 4' 4' 1" - 4' 4" 4' 5" - 4' 8" 4' 9" - 5' 5' 1" - 5' 4" 5' 5" - 5' 8" 5' 9" - 6' 6' 1" - Over
Under 60 Lbs. 26" 27" 28" 29" 29"
61 - 70 27" 27" 28" 29" 30" 30"
71 - 80 28" 28" 29" 30" 30" 31"
81 - 90 28" 29" 29" 30" 30" 31" 32"
91 - 100 28" 29" 30" 30" 31" 31" 32"
101 - 110 29" 29" 30" 30" 31" 31" 32"
111 - 120 29" 29" 30" 30" 31" 31" 32"
121 - 130 29" 30" 30" 30" 31" 32" 33" 33"
131 - 140 29" 30" 30" 31" 31" 32" 33" 33"
141 - 150 30" 30" 31" 31" 32" 33" 33"
151 - 160 30" 31" 31" 32" 32" 33" 33" 33"
161 - 170 31" 31" 32" 32" 33" 33" 34"
171 - 180 32" 33" 33" 34" 34"
Over 180 33" 33" 34" 34"
AGE 5 - 7 years old 8 - 9 10 11 - 12 13 - 14 15 - 16
LENGTH 24" - 26" 26" - 28" 28" - 29" 30" - 31" 31" - 32" 32" - 33"


Bat length is measured in inches from knob to end cap. A longer bat gives you greater reach, allowing you to hit balls on the outside part of the plate. However, longer bats also tend to have more mass towards the end of the bat that requires more power to swing them. We recommend swinging bats of different lengths to decide what option best suits your swing. The right combination of length and weight will help you reach your peak performance. Read More ...


Bat weight is measured in ounces (oz.). A bat’s weight is often tied to its “weight drop” -- its length in inches versus its weight in ounces. For instance, a 30-inch, 20-ounce bat would be referred to as a -10 bat. Read More ...


*This is for example purposes only. The best way to find the right size bat for you is to demo the bat, preferably against live pitch speeds.
**Manufacturing tolerances, performance considerations and grip weight may cause variations from the listed weight.



Governing bodies (for example, the USSSA and USA Baseball) set unique standards for bat performance. Bat manufacturers make bats to meet these standards. Each standard, however, is different. So, bats meeting one standard may not meet another. Bats are marked with logos identifying the standard which they meet.

Leagues adopt the standard they deem appropriate for play under their particular rules. League adoptions vary region by region, so we highly recommend consulting your coach and/or league official to understand the standard adopted by your league prior to purchasing a new bat.

The following information will help you understand in the standard adopted by your league:

Select your governing body or league*:

*Regulations for each league are subject to change. In order to have the most up-to-date information, please contact your coach or league official.


College and High School Baseball

  • -3 Drop Weight
  • Barrel Diameter 258” or less


Senior League Baseball

  • Weight Drop Varies
  • Barrel Diameter Varies


USABat Standard

  • No Weight Restriction
  • Maximum Barrel Diameter of 258


College and High School Baseball

  • Maximum drop weight of -3
  • Maximum barrel diameter of 258
  • Most wood bats are allowed under BBCOR rules

There are multiple ways to recognize a BBCOR bat. The easiest way is to look for the BBCOR certification stamp on the bat where the handle meets the barrel. Another way to identify a BBCOR DeMarini bat is the blue sticker on the packaging.

Wood bats are also legal for BBCOR play and do not need the BBCOR mark. Wood composite bats on the other hand do need the BBCOR mark to be legal for play.

Not all -3 BBCOR bats feel the same. Often, a line of BBCOR bats is made with varying swing weights, from light-swinging to balanced to end-loaded. The swing weight is influenced by how the bat’s weight is distributed. End-loaded bats have more weight toward the end cap, more and have a relatively higher swing weight for that reason. More balanced bats have their weight distributed more evenly and have a relatively lower swing weight for that reason. For more information on end-loaded and balanced bats, please see the Bat Technology section.




USSSA - United States Sports Specialty Association

USSSA (United States Sports Specialty Association) is one of the largest baseball associations in the United States. USSSA separates their regulations by age group, with a range of permitted weight drops and barrel diameters. In order to find the most accurate information about what can be used in your USSSA league, we recommend contacting your coach and/or league official, or checking the USSSA website.

Ways to recognize bats certified for USSSA play include the USSSA logo on the taper of the bat, and the red knob and packaging sticker.

Weight drops vary in Senior League baseball, but players 10 years old and under often use -10 weight drop bat. Players 12 years old and under often use a -8 weight drop, and 13 year old players often use a -5 weight drop.**

**These are recommendations. Check with your coach/league official to find out what your league rules allow.





Effective January 1st, 2018, USA Baseball will adopt a new bat standard for youth baseball bats. All players participating in leagues that have adopted the USA Baseball bat standard will be required to use a USA Baseball-certified bat (a “USABat(s)” Standard). On January 1, only bats that have the USA Baseball mark will be legal for play in these leagues.

USABats will have these marks:

The following national member organizations will be adopting the USA Baseball bat standard beginning January 1, 2018:


What’s different about the new USA Baseball bat standard and how do the bats differ?

USABats can have barrels up to 2 58” diameter and do not have weight drop restrictions.

USABats are marked with a new USA baseball logo located just above the grip on a bat.

What does the USA Baseball bat standard replace?*

It replaces the standards previously adopted by the member organizations: American Amateur Baseball Congress (AABC), Babe Ruth Baseball/Cal Ripken Baseball, Dixie Youth Baseball & Dixie Boys Baseball, Little League Baseball and PONY Baseball.

When does the new USA Baseball bat standard go into effect?

Bats with the new USA Baseball approval stamp were made available for purchase on September 1, 2017. Players participating in leagues adopting the new USA Baseball bat standard must use approved bats beginning on January 1, 2018. Check with your league to see if they are adopting the new USA Baseball bat standard.

How do I know if my bat is allowed?

USABats will have the USA Baseball mark shown below on the area between the bat’s barrel and grip. We always recommend that you check with our local league to see if your bat is approved.

To help you find these bats in store - all DeMarini bats will have a green sticker identifying it as USA Baseball approved.

I just bought an older, non-USABat, can I return it?

We recommend you work directly with the retailer where the bat was purchased. For bats purchased on please see our warranty policy.

What bat sizes are allowed?

USA Baseball bat standard has no restrictions in weight drop. In addition, bats with a 2 14” and 2 58” barrel diameter are approved under the USA Baseball bat standard.

Are there any material restrictions?

USA Baseball approved bats can be composite, alloy, wood or a combination of these materials.

Can I use a wood bat in leagues adopting the USA Baseball bat standard?

Yes; provided the wood bat bears a USA Baseball mark. Please check with your coach/league official to find out what wood bats are approved in your league.

What leagues are using this standard?

The following leagues will have adopted the USA Baseball bat standard; American Amateur Baseball Congress (AABC), Babe Ruth Baseball/Cal Ripken Baseball, Dixie Youth Baseball & Dixie Boys Baseball, Little League Baseball and PONY Baseball. *Note: Any league can adopt the USA Baseball bat standard. So, we recommend checking with your local league before purchasing a bat.

What about tee ball?

TThe new USA Baseball bat standard also covers tee ball bats. As of January 1, 2018, a tee ball bat will only be permitted for play in leagues that have adopted the USABat Standard, if the bat (1) bears the USA Baseball mark and (2) is used only with USA Baseball-approved tee balls.

Tee ball bats are not required to undergo lab testing to be approved under the USA Baseball bat standard – but they must bear the new USA Baseball mark on the bat.

Are fastpitch softball bats covered by the USA Baseball bat standard?

No – The USA Baseball bat standard only applies to youth baseball that plays under USA baseball rules.

What DeMarini bats are USA Baseball-certified?

DeMarini has multiple bats available in a variety of swing weights, lengths, and materials. You can check them out here: USA Bat page

*In order to have the most up-to-date information or if you have specific questions about your league, please contact your coach and/or league official.



A bat is more than just a hunk of metal or wood. It is a carefully-engineered tool that allows players to get the most out of every swing. Every component of the bat, from the knob to the end cap, is designed to maximize every ounce of performance. There are four main technical components you need to know for your bat: Material, Construction, Barrel Diameter and Weight Balance.


One of the biggest influences on bat performance is its material. Bats are made of metal, composites, or wood. Metal and composite bats are typically made of composite or alloy material, and are traditionally used for youth baseball through college baseball. Wood, meanwhile, is used throughout the professional levels, as well as for specific amateur and travel ball leagues/organizations. Please read below to learn more about bat materials and how they affect performance.

Composite Vs. Alloy

Non-wood bats are built from either alloy, composite, or a combination of the two.


Composite bats are made with a layered material (often carbon fiber) that is easy to distribute, giving us the ability to make bats with a variety of swing weights, from balanced to end-loaded.

Pros of Composite:

  • Minimize the sting from a mis-hit ball by reducing vibration to the hands

  • Often have a larger sweet spot than alloy bats



Alloy is a mixture of two or more metals, and has been commonly used in baseball bats for years.

Pros of Alloy:

  • Stiffer feel through the swing zone

  • More durable material


Wood Composite*

These bats differ from other wood bats, since they are multiple combinations of materials -- rather than one natural piece of wood -- with the goal of increased durability with wood-like performance. While wood composites are less susceptible to breakage, they also require league approval for use. So before buying a wood composite bat, make sure it is approved for play in your league.

*Wood bats are more likely to break or crack on mishits than Alloy and Composite bats.



One-piece bats are one complete piece of composite or alloy and are often used by power hitters, since they provide less flex on contact.

Two-piece bats are comprised of two separate parts: the barrel and the handle. The handle is connected to the barrel through a transition piece in the taper area of the bat. Two-piece construction helps minimize vibration on mis-hit balls. Those bats are preferred by contact hitters, since the two-part construction helps generate maximum swing speed without the fear of major sting on contact.

Barrel Diameter

The barrel is the thickest and widest part of the bat used to hit the ball. The barrel is where you want to hit the ball in order to achieve maximum performance.

Barrels come in different sizes, and are measured by diameter. Barrel diameter is measured in inches and, like weight drop, certain leagues limit the size of a bat’s barrel. Please refer to the Your League on what your league requires. Generally, these are the most common barrel diameters:

  • 34 inches
  • 58 inches
  • 12 inches
  • 14 inches

Swing Weight

A factor you may not see, but will definitely feel is the swing weight* of your bat. Bats are often segmented by their given length and weight. The Swing weight is a determination of how a bat’s particular weight is distributed along the bat’s length. For example, you can have two bats that are 30 ounces, but that have different swing weights because the 30 ounces are distributed differently in the bat. Bats can fall along the swing weight spectrum, from light to balanced to end-loaded.

End-loaded bats shift extra weight toward the end of the barrel, creating more whip-like action on a player’s swing and generating more power.

Balanced bats have a more even weight distribution, allowing for potentially greater swing speed for many hitters. This is preferred by contact hitters who want more control of their swing.

DeMarini bats use different names to identify end-load versus balance. End-loaded bats feature the word “Insane” in the bat name, while balanced bats feature the word “Zen".

*Note - there are a variety of swing weights offered to meet player needs.