Microgram to Milligram Converter
Weight · unit-converter
Convert Microgram to Milligram with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Microgram (ug)
To: Milligram (mg)
About Microgram
The microgram is one millionth of a gram. It appears in pharmacology and trace analysis.
About Milligram
The milligram is one thousandth of a gram. Medication doses and fine measurements use milligrams.
How to convert micrograms to milligrams
1 microgram is equal to 0.001 milligram:
1 ug = (0.000001 g ÷ 0.001 g) mg = 0.001 mg
Each microgram is defined as 0.000001 g and each milligram as 0.001 g, so one ug equals 0.000001 ÷ 0.001 mg = 0.001 mg.
Let w(ug) be the numeric value of the same mass measured in Microgram (ug), and w(mg) the value in Milligram (mg). Then:
w(mg) = w(ug) × (0.000001 / 0.001)
Equivalently, divide by how many ug fit into one mg (grams per mg divided by grams per ug):
w(mg) = w(ug) ÷ 1000.00000000000011
Or: milligram = microgram ÷ 1000.00000000000011
Examples
Example #1: Convert 20 ug to milligram
20 ug = 20 ug × (0.000001/0.001) mg = 0.02 mg
20 ug = 20 ug ÷ 1000.00000000000011 = 0.02 mg
Example #2: Convert 50 ug to milligram
50 ug = 50 ug × (0.000001/0.001) mg = 0.05 mg
50 ug = 50 ug ÷ 1000.00000000000011 = 0.05 mg
Summary
To convert Microgram to Milligram, multiply the value in ug by the ratio of grams per ug divided by grams per mg. Equivalently: value_mg = value_ug × (0.000001 / 0.001). Numerically, 1 ug equals 0.001 mg.
Relationship context
Both units are metric (SI) and tied to the gram via the kilogram. Conversions use exact ratios from their gram definitions. The factor from Microgram to Milligram is 1.000000e-3 (1 ug = 0.001 mg).
Conversion tables
| Microgram (ug) | Milligram (mg) |
|---|---|
| 0.1 | 0.0001 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 6 | 0.006 |
| 7 | 0.007 |
| 8 | 0.008 |
| 9 | 0.009 |
| Microgram (ug) | Milligram (mg) |
|---|---|
| 10 | 0.01 |
| 20 | 0.02 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 60 | 0.06 |
| 70 | 0.07 |
| 80 | 0.08 |
| 90 | 0.09 |
| 100 | 0.1 |