Correction for the weight of an American Football
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How heavy is 315 miligrams?
It's about one-one-thousand-five-hundredth as heavy as an American Football
The weight of an American Football is about 411,068.0853125 miligrams.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 396,893.323750 miligrams and 425,242.8468750 miligrams. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.