Weight of a Major League Baseball According to the rule book, a Baseball must weigh at least 5 ounces and can not exceed 5.25 ounces.
Official balls must weigh between 5 and 5 1/4 ounces.
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Major League baseballs are made to regulation size. The weight of a Rawlings Official Major League Baseball game ball cannot be less than five ounces nor more than 5 ¼ ounces. The size of the baseball cannot be less than nine nor more than 9 ¼ inches in circumference. The circumference of a baseball is the length around it.
Major League baseballs are made to regulation size. The weight of a Rawlings Official Major League Baseball game ball cannot be less than five ounces nor more than 5
An official baseball weighs 5 ounces
That answer is in ounces when you asked for pounds an official MLB baseball weighs in at 0.3125 pounds, so not even a pound.
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The weight of an official baseball is 5 oz (142g).
(The official range is 5.0 to 5.25 ounces, and 2.9 inches in diameter.)