Milligram to Microgram Converter
One Milligram equals 1000 Microgram (1 mg = 1000 ug). Multiply a Milligram value by 1000 to get the equivalent in Microgram. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
ug = mg × 1000
Multiply the Milligram value by 1000 to get the equivalent value in Microgram.
Example Conversions
1 Milligram (mg)
1000 Microgram (ug)
5 Milligram (mg)
5000 Microgram (ug)
10 Milligram (mg)
10000 Microgram (ug)
25 Milligram (mg)
25000 Microgram (ug)
100 Milligram (mg)
100000 Microgram (ug)
Conversion Table
| Milligram (mg) | Microgram (ug) |
|---|---|
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |
How to Convert Manually
Use these steps to convert Milligram values to Microgram without the calculator.
- Write down the value in Milligram (mg) that you want to convert.
- Multiply that value by 1000.
- For example, 10 Milligram × 1000 = 10000 Microgram.
- Label the result as Microgram (ug).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Milligram and one Microgram.
About Milligram and Microgram
The milligram is one thousandth of a gram, or a millionth of a kilogram. Medication dosages and trace nutrient amounts are stated in milligrams. 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. One Milligram equals 1000 Microgram (1 mg = 1000 ug). Milligram to Microgram conversion comes up most often in medication dosages and in vitamin and supplement labels, typically when figures need restating for vitamin labels (mcg).
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
15 Milligram equals 15000 Microgram.
15 mg × 1000 = 15000 ug
FAQ
How do I convert Milligram to Microgram?
Multiply the Milligram value by 1000 to get the equivalent value in Microgram.
What is the formula for Milligram to Microgram?
The formula is ug = mg × 1000.
How many Microgram are in 1 Milligram?
1 Milligram equals 1000 Microgram.
Can I convert Microgram back to Milligram?
Yes. 1 Microgram equals 0.001 Milligram, and the related converter can reverse the calculation.
What are common names for Milligram and Microgram?
Milligram is shown as mg and may also be searched as milligrams, milligramme, milligrammes. Microgram is shown as ug and may also be searched as micrograms, mcg.
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