Micrograms to milligrams
Type a value in micrograms to see it in milligrams straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the micrograms box.
- Read the result in milligrams as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mg = µg × 0.001
Multiply the value in micrograms by 0.001 to get milligrams.
Example
To convert 25 µg to milligrams: 25 × 0.001 = 0.025 mg.
Conversion table
| Micrograms (µg) | Milligrams (mg) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
About the units
- Microgram
- One millionth of a gram, often written mcg on medicine labels and used for vitamins such as D and B12.
- Milligram
- One thousandth of a gram, used for medicine and supplement doses.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many milligrams are in one microgram?
1 µg = 0.001 mg exactly.
How do I convert micrograms to milligrams?
Use mg = µg × 0.001. For example, 25 µg = 0.025 mg.
How many micrograms are in one milligram?
1 mg = 1,000 µg.
Are mass and weight the same thing?
Strictly no: mass is the amount of matter, in kilograms, while weight is the force of gravity on it, in newtons. Scales display mass, so everyday language uses the two words interchangeably.
What is the difference between an ounce and a troy ounce?
An ordinary ounce is 28.349523125 grams and is used for food and goods, while a troy ounce is 31.1034768 grams and is used to price gold and silver.