Milligram to Microgram Converter
Weight · unit-converter
Convert Milligram to Microgram 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: Milligram (mg)
To: Microgram (ug)
About Milligram
The milligram is one thousandth of a gram. Medication doses and fine measurements use milligrams.
About Microgram
The microgram is one millionth of a gram. It appears in pharmacology and trace analysis.
How to convert milligrams to micrograms
1 milligram is equal to 1000.00000000000011 microgram:
1 mg = (0.001 g ÷ 0.000001 g) ug = 1000.00000000000011 ug
Each milligram is defined as 0.001 g and each microgram as 0.000001 g, so one mg equals 0.001 ÷ 0.000001 ug = 1000.00000000000011 ug.
Let w(mg) be the numeric value of the same mass measured in Milligram (mg), and w(ug) the value in Microgram (ug). Then:
w(ug) = w(mg) × (0.001 / 0.000001)
Equivalently, divide by how many mg fit into one ug (grams per ug divided by grams per mg):
w(ug) = w(mg) ÷ 0.001
Or: microgram = milligram ÷ 0.001
Examples
Example #1: Convert 20 mg to microgram
20 mg = 20 mg × (0.001/0.000001) ug = 20000 ug
20 mg = 20 mg ÷ 0.001 = 20000 ug
Example #2: Convert 50 mg to microgram
50 mg = 50 mg × (0.001/0.000001) ug = 50000 ug
50 mg = 50 mg ÷ 0.001 = 50000 ug
Summary
To convert Milligram to Microgram, multiply the value in mg by the ratio of grams per mg divided by grams per ug. Equivalently: value_ug = value_mg × (0.001 / 0.000001). Numerically, 1 mg equals 1000.0000000000001 ug.
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 Milligram to Microgram is 1.000000e+3 (1 mg = 1000.0000000000001 ug).
Conversion tables
| Milligram (mg) | Microgram (ug) |
|---|---|
| 0.1 | 100 |
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 6 | 6,000 |
| 7 | 7,000 |
| 8 | 8,000 |
| 9 | 9,000 |
| Milligram (mg) | Microgram (ug) |
|---|---|
| 10 | 10,000 |
| 20 | 20,000 |
| 30 | 30,000 |
| 40 | 40,000 |
| 50 | 50,000 |
| 60 | 60,000 |
| 70 | 70,000 |
| 80 | 80,000 |
| 90 | 90,000 |
| 100 | 100,000 |