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Easy to do. There are about 0.064 grams in one grain. Therefore, use this formula to convert grains to grams: grains x 0.064 = grams

  • Your example: 21 grains x 0.064 = about 1.360 grams
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13y ago
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12y ago

Multiply the number of grams by 1,000 to convert to milligrams, so 21 grams equals 21,000 milligrams.

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Q: How do you convert 21 grains to grams?
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