How many mcg are in 1 mg?
There are 1,000 micrograms in one milligram.
Micrograms to Milligrams Converter
Convert small metric mass and dose units accurately.
Convert mcg and mg
Check the unit carefully because the factor is one thousand.
About this converter
How to use Micrograms to Milligrams Converter, plus the formulas and logic behind the results.
Tool description
A milligram contains 1,000 micrograms. The abbreviations mcg and µg both mean microgram.
How to use
- Choose the direction.
- Enter the amount.
- Check that mcg or mg matches the source.
- Select Calculate.
Formulas & reference
1 mg = 1,000 mcgmg = mcg ÷ 1,000mcg = mg × 1,000
Quick reference
- 1 mg = 1,000 mcg
- mg = mcg ÷ 1,000
- mcg = mg × 1,000
Calculation logic
Micrograms are divided by 1,000 for milligrams; milligrams are multiplied by 1,000 for micrograms.
Results use standard stated conversion factors and may be rounded for display.
Micrograms to Milligrams Converter FAQ
Common questions about this conversion and how to interpret the result.
Is µg the same as mcg?
Yes. Both mean microgram.
How many mg are 500 mcg?
Five hundred micrograms equal 0.5 milligram.
How do I convert mg to mcg?
Multiply milligrams by 1,000.
Why must I check dose units carefully?
Confusing mg and mcg creates a thousandfold error.
Is this medical advice?
No. It performs unit math only; verify medication instructions with a qualified professional.