About the kg to mg calculation
One kilogram is exactly 1,000,000 milligrams, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The SI base unit of mass, and how bodyweight is quoted in most of the world. The usual unit for medication doses and nutrient quantities.
Formula
mg = kg × 1,000,000
1 kg = 1,000,000 mg
1 mg = 0.000001 kgWorked example
To convert 70 kg, multiply by 1,000,000: 70 × 1,000,000 = 70,000,000 mg.
Frequently asked questions
How many milligrams are in a kilogram?
There are 1,000,000 milligrams in one kilogram. To convert any amount, multiply the number of kilograms by 1,000,000.
How do I convert milligrams back to kilograms?
Divide instead of multiplying, or equivalently multiply by 0.000001. One milligram is 0.000001 kilograms.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between kilograms and milligrams is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Kilograms: the SI base unit of mass, and how bodyweight is quoted in most of the world. Milligrams: the usual unit for medication doses and nutrient quantities.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units