How to Convert Milligrams to Kilograms (mg to kg)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert milligrams into kilograms by hand, with examples and a quick-reference table.
The conversion
To convert milligrams to kilograms, multiply the value by 1.000000e-06. To go the other way, divide by the same number (or multiply by 1,000,000). Because the factor is tiny, scientific notation keeps the numbers manageable.
Kilograms = milligrams × 1.000000e-06
Worked examples
- 3 mg = 3.000000e-6 kg
- 12.5 mg = 1.250000e-5 kg
- 75 mg = 7.500000e-5 kg
Milligrams to Kilograms table
| Milligrams | Kilograms |
|---|---|
| 1 mg | 1.000000e-6 kg |
| 2 mg | 2.000000e-6 kg |
| 5 mg | 5.000000e-6 kg |
| 10 mg | 1.000000e-5 kg |
| 20 mg | 2.000000e-5 kg |
| 25 mg | 2.500000e-5 kg |
| 50 mg | 5.000000e-5 kg |
| 100 mg | 1.000000e-4 kg |
| 250 mg | 0.00025 kg |
| 500 mg | 0.0005 kg |
| 1,000 mg | 0.001 kg |
Common questions
Is mg to kg exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Kilograms to Milligrams converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Milligrams to Kilograms Converter or browse all weight converters.
Run your own numbers: Milligrams to Kilograms Converter