Kilogram is a unit of mass, not of weight.
According to the Wikipedia article, "they generally range from six pounds to 16 pounds in weight"; in kilograms, that would be about half this amount (roughly 3-8 kilograms).
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A 16 pound ball would weight 7.25748 kg.
Using simple math, take the weight of the bowling ball in pounds and divide it by 2.2046