Formulas · Milligrams and micrograms
Formula reference
Milligram–microgram conversion 1 mg = 1000 mcg
Milligrams and micrograms differ by a factor of 1000. To go from mg to mcg multiply by 1000 (decimal three places right); from mcg to mg divide by 1000.
What each part means mg Milligram mcg Microgram (1/1000 of a mg)
Worked example 0.25 mg = 250 mcg; 400 mcg = 0.4 mg.
Practice only — never for real medication. DoseDrill generates problems to help nursing students learn dosage calculation. It must never be used to calculate, prepare, or administer medication to an actual patient. Real administration requires an independent double-check, current drug references, and your facility's policy. A wrong dose can harm or kill — always verify with a licensed professional.