larger mg

Is UG Smaller Than G? Therefore, 1 microgram = 0.001 milligram = 0.000001 grams, or 1,000,000 μg = 1 g. What is smaller than a gram? To measure weights smaller than 1 gram, we can use milligrams (mg) and micrograms (μg). 1000 mg = 1 g, 1000 μg = 1 mg, 1 000 000 μg