OK, IF AN ONZE WEIGHT IS 27.37 GM AND 16 ONZES IS EQUAL TO A POUND THEREFOR A POUND WEIGHTS 454 GM. SO, YOU MULTIPLY 0.454 KG TO THE NUMBRER OF POUNDS OF ANY BALL WEIGHT. EXAMPLE 0.454 x 15 = 6.810 KG. I HOPE, THAT THIS ANSWER HAS HELPED YOU TO KNOW HOW MUCH DOES A Bowling BALL WEIGHT IN METRICAL MEASUREMENT. ALEX SANCHEZ MEXICAN BOWLING TEAM COACH.
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Basic metric conversion is 1 pound = 453.59 grams. A gram is 1000 milligrams.
So if a ball weights 15 pounds then it weighs 6803.9 grams. 6803.9 times 1000 = 6803900 milligrams.