Micrograms to Milligrams Converter
One Microgram equals 0.001 Milligrams (1 ug = 0.001 mg). Multiply a Microgram value by 0.001 to get the equivalent in Milligrams. Enter your value in the calculator above. The formula and examples below show how to calculate it by hand.
Formula
mg = ug × 0.001
Multiply the Microgram value by 0.001 to get the equivalent value in Milligrams.
Example Conversions
1 Microgram (ug)
0.001 Milligram (mg)
5 Microgram (ug)
0.005 Milligram (mg)
10 Microgram (ug)
0.01 Milligram (mg)
25 Microgram (ug)
0.025 Milligram (mg)
100 Microgram (ug)
0.1 Milligram (mg)
Conversion Table
| Microgram (ug) | Milligram (mg) |
|---|---|
| 0.1 | 0.0001 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
How to Convert Manually
Use these steps to convert Microgram values to Milligram without the calculator.
- Write down the value in Microgram (ug) that you want to convert.
- Multiply that value by 0.001.
- For example, 10 Micrograms × 0.001 = 0.01 Milligrams.
- Label the result as Milligram (mg).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Microgram and one Milligram.
About Microgram and Milligram
The microgram is one millionth of a gram. It appears on supplement labels (often as mcg or µg) for vitamins like B12 and D, and in toxicology and air-quality limits. The milligram is one thousandth of a gram, or a millionth of a kilogram. Medication dosages and trace nutrient amounts are stated in milligrams. One Microgram equals 0.001 Milligrams (1 ug = 0.001 mg). Microgram is used in vitamin labels (mcg) and in air quality limits. Milligram is used in medication dosages.
Precision and Rounding:Metric-imperial mass factors are exact (1 lb = 0.45359237 kg by the 1959 agreement), so precision is purely a display choice. One decimal place is enough for body weight and cooking; nutrition labeling, pharmacy, and lab work need the full factor before rounding.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Micrograms equals0.015Milligrams.
15 ug × 0.001 = 0.015 mg
FAQ
How do I convert Microgram to Milligram?
Multiply the Microgram value by 0.001 to get the equivalent value in Milligrams.
What is the formula for Microgram to Milligram?
The formula is mg = ug × 0.001.
How many Milligrams are in 1 Microgram?
1 Microgram equals 0.001 Milligrams.
Can I convert Milligram back to Microgram?
Yes. 1 Milligram equals 1000 Micrograms, and the related converter can reverse the calculation.
What are common names for Microgram and Milligram?
Microgram is shown as ug and may also be searched as micrograms, mcg. Milligram is shown as mg and may also be searched as milligrams, milligramme, milligrammes.
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