Kilogram to Milligram Converter
Weight · unit-converter
Convert Kilogram 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: Kilogram (kg)
To: Milligram (mg)
About Kilogram
The kilogram is the SI base unit of mass (defined via fundamental constants). Everyday metric weights and science use kilograms and grams.
About Milligram
The milligram is one thousandth of a gram. Medication doses and fine measurements use milligrams.
How to convert kilograms to milligrams
1 kilogram is equal to 1000000 milligram:
1 kg = (1000 g ÷ 0.001 g) mg = 1000000 mg
Each kilogram is defined as 1000 g and each milligram as 0.001 g, so one kg equals 1000 ÷ 0.001 mg = 1000000 mg.
Let w(kg) be the numeric value of the same mass measured in Kilogram (kg), and w(mg) the value in Milligram (mg). Then:
w(mg) = w(kg) × (1000 / 0.001)
Equivalently, divide by how many kg fit into one mg (grams per mg divided by grams per kg):
w(mg) = w(kg) ÷ 0.000001
Or: milligram = kilogram ÷ 0.000001
Examples
Example #1: Convert 20 kg to milligram
20 kg = 20 kg × (1000/0.001) mg = 20000000 mg
20 kg = 20 kg ÷ 0.000001 = 20000000 mg
Example #2: Convert 50 kg to milligram
50 kg = 50 kg × (1000/0.001) mg = 50000000 mg
50 kg = 50 kg ÷ 0.000001 = 50000000 mg
Summary
To convert Kilogram to Milligram, multiply the value in kg by the ratio of grams per kg divided by grams per mg. Equivalently: value_mg = value_kg × (1000 / 0.001). Numerically, 1 kg equals 1000000 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 Kilogram to Milligram is 1.000000e+6 (1 kg = 1000000 mg).
Conversion tables
| Kilogram (kg) | Milligram (mg) |
|---|---|
| 0.1 | 100,000 |
| 1 | 1,000,000 |
| 2 | 2,000,000 |
| 3 | 3,000,000 |
| 4 | 4,000,000 |
| 5 | 5,000,000 |
| 6 | 6,000,000 |
| 7 | 7,000,000 |
| 8 | 8,000,000 |
| 9 | 9,000,000 |
| Kilogram (kg) | Milligram (mg) |
|---|---|
| 10 | 10,000,000 |
| 20 | 20,000,000 |
| 30 | 30,000,000 |
| 40 | 40,000,000 |
| 50 | 50,000,000 |
| 60 | 60,000,000 |
| 70 | 70,000,000 |
| 80 | 80,000,000 |
| 90 | 90,000,000 |
| 100 | 100,000,000 |