Milligram to Kilogram Converter
Weight · unit-converter
Convert Milligram to Kilogram 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: Kilogram (kg)
About Milligram
The milligram is one thousandth of a gram. Medication doses and fine measurements use milligrams.
About Kilogram
The kilogram is the SI base unit of mass (defined via fundamental constants). Everyday metric weights and science use kilograms and grams.
How to convert milligrams to kilograms
1 milligram is equal to 0.000001 kilogram:
1 mg = (0.001 g ÷ 1000 g) kg = 0.000001 kg
Each milligram is defined as 0.001 g and each kilogram as 1000 g, so one mg equals 0.001 ÷ 1000 kg = 0.000001 kg.
Let w(mg) be the numeric value of the same mass measured in Milligram (mg), and w(kg) the value in Kilogram (kg). Then:
w(kg) = w(mg) × (0.001 / 1000)
Equivalently, divide by how many mg fit into one kg (grams per kg divided by grams per mg):
w(kg) = w(mg) ÷ 1000000
Or: kilogram = milligram ÷ 1000000
Examples
Example #1: Convert 20 mg to kilogram
20 mg = 20 mg × (0.001/1000) kg = 0.00002 kg
20 mg = 20 mg ÷ 1000000 = 0.00002 kg
Example #2: Convert 50 mg to kilogram
50 mg = 50 mg × (0.001/1000) kg = 0.00005 kg
50 mg = 50 mg ÷ 1000000 = 0.00005 kg
Summary
To convert Milligram to Kilogram, multiply the value in mg by the ratio of grams per mg divided by grams per kg. Equivalently: value_kg = value_mg × (0.001 / 1000). Numerically, 1 mg equals 0.000001 kg.
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 Kilogram is 1.000000e-6 (1 mg = 0.000001 kg).
Conversion tables
| Milligram (mg) | Kilogram (kg) |
|---|---|
| 0.1 | 0.0000001 |
| 1 | 0.000001 |
| 2 | 0.000002 |
| 3 | 0.000003 |
| 4 | 0.000004 |
| 5 | 0.000005 |
| 6 | 0.000006 |
| 7 | 0.000007 |
| 8 | 0.000008 |
| 9 | 0.000009 |
| Milligram (mg) | Kilogram (kg) |
|---|---|
| 10 | 0.00001 |
| 20 | 0.00002 |
| 30 | 0.00003 |
| 40 | 0.00004 |
| 50 | 0.00005 |
| 60 | 0.00006 |
| 70 | 0.00007 |
| 80 | 0.00008 |
| 90 | 0.00009 |
| 100 | 0.0001 |