Micrograms to Milligrams Converter
Convert micrograms to milligrams instantly. Enter mcg to get mg by dividing by 1000, with the reverse milligrams to micrograms direction shown.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Micrograms to Milligrams Converter Works
This tool converts micrograms (mcg or µg) to milligrams (mg) and back. Both are metric units of mass. A milligram is one thousandth of a gram, and a microgram is one thousandth of a milligram, so 1 mg equals 1000 mcg.
The Formula
Milligrams = micrograms ÷ 1000 Micrograms = milligrams × 1000
The conversion is exact and amounts to shifting the decimal point three places, since both units are powers of ten within the metric system.
Worked Example
Convert 500 mcg (a common vitamin dose) to milligrams:
- Milligrams = 500 ÷ 1000 = 0.5 mg
A larger amount, 2,500 mcg:
- 2,500 ÷ 1000 = 2.5 mg
Going the other way, 5 mg in micrograms:
- Micrograms = 5 × 1000 = 5,000 mcg
Micrograms to Milligrams Quick Reference
| Micrograms (mcg) | Milligrams (mg) |
|---|---|
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
| 5000 | 5 |
Why This Conversion Matters
Vitamin and medication labels mix these units freely: some nutrients are listed in micrograms (like vitamin B12 or folic acid) and others in milligrams (like vitamin C). Converting lets you compare doses on the same scale and avoid the dangerous error of confusing a microgram with a milligram, which differ by a factor of 1000. Always verify medical doses against the label and your provider’s advice.
Frequently asked questions
How many micrograms are in a milligram?+
There are 1000 micrograms (mcg) in one milligram (mg). So 500 mcg equals 0.5 mg. To convert micrograms to milligrams, divide by 1000.
How do I convert micrograms to milligrams?+
Divide the microgram value by 1000, or move the decimal point three places left. For example, 500 mcg ÷ 1000 = 0.5 mg. To reverse it, multiply milligrams by 1000.
What is 500 mcg in mg?+
500 micrograms equals 0.5 milligrams. Supplements often list amounts in mcg, so converting to mg helps compare them with other doses given in milligrams.
Is mcg the same as µg?+
Yes. Both mcg and µg stand for microgram. The abbreviation mcg is preferred on medicine labels to avoid confusion with mg, since handwritten µg can be misread.
How many mcg is 1 mg?+
1 milligram equals 1000 micrograms. So a 1 mg tablet contains the same mass as 1000 mcg, just expressed in a larger unit.