What are the current rules and regulations regarding Adult baseball bats?

Adult bats must have a -3 length to weight ratio and 2 5/8 inch barrel. In high school and collegiate sanctioned leagues, bats must be 31"-34" long to be legal.


BBCOR stands for Bat-Ball Coefficient of Restitution and is something you've probably heard a lot about recently. In late 2010, the National Collegiate Athletic Association (NCAA) and National Federation of State High School Associations (NFHS) announced their intention to ban composite-barreled bats and move from a BESR standard to a BBCOR standard for bats. Please see below for the current rules and regulations regarding the use of adult baseball bats. For an explanation of what each of these standards means, click here.


As of Jan 1, 2011, all non-wood baseball bats must be BBCOR certified to be used in NCAA and collegiate play.


Outside of California, all BESR certified bats with alloy barrels are still legal until January 1, 2012. Also legal for this year are composite bats that passed the BESR-ABI test (more on that below). Beginning January 1, 2012, all non-wood bats used in high school play must be BBCOR Certified.


Starting Jan 1, 2011, the California Interscholastic Federation (CIF) requires that all non-wood bats must be BBCOR Certified or on the BESR-ABI approved list. Even BESR Certified bats with alloy barrels are not legal for play in California in 2011 unless they have received the ABI waiver.

Other Organizations

Many unsanctioned high school baseball organizations have followed suit in implementing the NFHS standards for composite bats. Check with your organization before purchasing a composite-barreled bat.


Ball Exit Speed Ratio (BESR) was the former standard that governed adult baseball bats. After composite-barreled adult bats were banned by the NFHS and NCAA in 2010, bat manufacturers were allowed to apply for a waiver for certain bats. In order to receive this waiver, their bats had to undergo Accelerated Break-In (ABI) testing. This procedure tested composite bats after they had been broken-in to ensure they were not too hot for play. Bats that received the waiver can be used in high school play across the country (including California) in 2011. For a list of BESR-ABI certified bats, click here.