Milligram to Kilogram Converter
One Milligram equals 0.000001 Kilogram (1 mg = 0.000001 kg). Multiply a Milligram value by 0.000001 to get the equivalent in Kilogram. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
kg = mg × 0.000001
Multiply the Milligram value by 0.000001 to get the equivalent value in Kilogram.
Example Conversions
1 Milligram (mg)
0.000001 Kilogram (kg)
5 Milligram (mg)
0.000005 Kilogram (kg)
10 Milligram (mg)
0.00001 Kilogram (kg)
25 Milligram (mg)
0.000025 Kilogram (kg)
100 Milligram (mg)
0.0001 Kilogram (kg)
Conversion Table
| Milligram (mg) | Kilogram (kg) |
|---|---|
| 0.1 | 1.000000e-7 |
| 0.5 | 5.000000e-7 |
| 1 | 0.000001 |
| 2 | 0.000002 |
| 5 | 0.000005 |
| 10 | 0.00001 |
| 25 | 0.000025 |
| 50 | 0.00005 |
| 100 | 0.0001 |
| 250 | 0.00025 |
| 500 | 0.0005 |
| 1000 | 0.001 |
How to Convert Manually
Use these steps to convert Milligram values to Kilogram without the calculator.
- Write down the value in Milligram (mg) that you want to convert.
- Multiply that value by 0.000001.
- For example, 10 Milligram × 0.000001 = 0.00001 Kilogram.
- Label the result as Kilogram (kg).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Milligram and one Kilogram.
About Milligram and Kilogram
The milligram is one thousandth of a gram, or a millionth of a kilogram. Medication dosages and trace nutrient amounts are stated in milligrams. The kilogram is the SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by the old platinum-iridium prototype. It is the reference for every other mass unit on this site. One Milligram equals 0.000001 Kilogram (1 mg = 0.000001 kg). Milligram to Kilogram conversion comes up most often in medication dosages and in vitamin and supplement labels, typically when figures need restating for body weight outside the US.
Precision and Rounding: Metric-imperial mass factors are exact (1 lb = 0.45359237 kg by the 1959 agreement), so precision is purely a display choice. One decimal place is enough for body weight and cooking; nutrition labeling, pharmacy, and lab work need the full factor before rounding.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Milligram equals 0.000015 Kilogram.
15 mg × 0.000001 = 0.000015 kg
FAQ
How do I convert Milligram to Kilogram?
Multiply the Milligram value by 0.000001 to get the equivalent value in Kilogram.
What is the formula for Milligram to Kilogram?
The formula is kg = mg × 0.000001.
How many Kilogram are in 1 Milligram?
1 Milligram equals 0.000001 Kilogram.
Can I convert Kilogram back to Milligram?
Yes. 1 Kilogram equals 1000000 Milligram, and the related converter can reverse the calculation.
What are common names for Milligram and Kilogram?
Milligram is shown as mg and may also be searched as milligrams, milligramme, milligrammes. Kilogram is shown as kg and may also be searched as kilograms, kilo, kilos.
Was this page helpful?
Let us know if this converter met your needs.