How many grams are equivalent to 30 mg?

• A. 0.03
• B. 0.3
• C. 3
• D. 300

Answer: (A)

Understanding mass unit conversions: 1 gram equals 1000 milligrams. To express 30 milligrams in grams, divide by 1000. 30 ÷ 1000 = 0.03, so 30 mg is 0.03 g. This direct division by 1000 is the standard method and keeps the decimal in the correct position.

If you look at the other numbers, they represent larger amounts in grams: 0.3 g would be 300 mg, 3 g would be 3000 mg, and 300 g would be 300,000 mg. They’re not equivalent to 30 mg because the decimal place is shifted too far.