What does -3 -5 -11 ect mean on a baseball bat?

Answer 1

That number (-3, -5) is called the bat 'weight drop' and is the difference in ounces of bat weight versus inches in bat length. For example, a 33 inch long bat that weighs 30 ounces is a -3. A 33 inch bat that weighs 28 ounces is a -5. A 34 inch bat that weighs 27 ounces is a -7.

Answer 2

it's the length compared to weight. -3 bat means 33inch 30oz bat