CCBMA Math and Dosage Calculations Practice Test 2026 - Free CCBMA Practice Questions and Study Guide

Understanding metric prefixes helps with unit conversions. Milli- means one thousandth, so a milligram is one thousandth of a gram. That makes the abbreviation mg. The gram is the base unit, so g would be a whole gram, not a fraction. Kilogram (kg) is 1000 grams, and microgram (mcg) is one millionth of a gram, both not equal to a milligram. In practice, medicine often uses milligrams because it provides a convenient, measurable amount for many drugs. So the correct abbreviation is mg.