Milligram is 0.001 gram units.
Milligrams to Micrograms Converter — mg to ug
Convert Milligram (mg) to Microgram (ug) using the exact conversion factor (1 milligram = 1,000 microgram). See the formula, worked examples, and conversion table.
Milligrams to Micrograms converter
Converter
Scientific Units Converter
Convert SI derived units, scientific notation-friendly units, atomic units, and lab measurements.
Context values
Some unit families need one extra value for a physically accurate result.
Microgram is 0.000001 gram units.
Result = input x 1e-6 / 1e-9.
Mass units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Milligrams to Micrograms
Milligram and Microgram are both scientific-measurement units, spanning everything from atomic and laboratory scales to astronomical distances — the kind of conversion that comes up constantly in physics, chemistry, and astronomy when a result needs to move between conventions used in different subfields. Specifically: Milligram is 0.001 gram units, and microgram is 0.000001 gram units.
Formula
micrograms = milligrams × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram equals 0.000001 base units, and 1 microgram equals 1e-9 base units, so dividing one by the other gives the direct milligram-to-microgram factor of 1000.
Simple example
1 mg × 1000 = 1,000 ug
1 milligram = 1,000 micrograms.
Real-world example
10 mg × 1000 = 10,000 ug
10 milligrams = 10,000 micrograms.
Conversion table
| Milligram (mg) | Microgram (ug) |
|---|---|
| 0.001 mg | 1 ug |
| 0.01 mg | 10 ug |
| 1 mg | 1,000 ug |
| 10 mg | 10,000 ug |
| 100 mg | 100,000 ug |
| 1,000 mg | 1,000,000 ug |
Reverse conversion: Microgram to Milligram
1 ug × 0.001 = 0.001 mg
1 microgram = 0.001 milligrams.
milligrams = micrograms × 0.001
For a page dedicated to this direction, see Microgram to Milligram.
Understanding the Milligram (mg)
Milligram is 0.001 gram units.
Understanding the Microgram (ug)
Microgram is 0.000001 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many micrograms are in 1 milligram?
1 milligram equals 1,000 micrograms, using the exact defined conversion factor rather than an estimate.
How do I convert milligram to microgram?
Multiply the milligram value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert microgram back to milligram?
Use the reverse factor: 1 microgram equals 0.001 milligrams. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram?
Milligram (mg) is a unit of scientific units.
What is a microgram?
Microgram (ug) is a unit of scientific units.
Is the milligram to microgram conversion exact?
Yes. Both milligram and microgram are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.
Why does this category span everything from atomic to astronomical scales?
Scientific work spans an enormous range of physical scales, from atomic distances (measured in angstroms or atomic mass units) to interstellar distances (measured in astronomical units or parsecs), so this category groups SI-derived and scale-specific units that researchers commonly need to convert between within their field.