Convert kilograms to milligrams
Enter a value in kilograms to convert it to milligrams.
kilograms to milligrams reference
| kilograms | milligrams |
|---|---|
| 1 kg | 1000000 mg |
| 2 kg | 2000000 mg |
| 5 kg | 5000000 mg |
| 10 kg | 10000000 mg |
| 25 kg | 25000000 mg |
| 50 kg | 50000000 mg |
| 100 kg | 100000000 mg |
The conversion factor
One kilogram is 1000000 milligrams. So to convert, multiply your figure in kilograms by 1000000. To go the other way, multiply milligrams by 0.000001.
Doing it in your head
For a quick estimate, round the factor: roughly "times 1000000". Use the exact converter above when the number matters.
Where this conversion comes up
Recipes, shipping and luggage limits, body weight, and nutrition labels.
See the common unit conversions cheat sheet for the factors worth memorising.
Related tools
Frequently asked questions
How many milligrams are in a kilogram?
1 kilogram = 1000000 milligrams.
What is the formula to convert kilograms to milligrams?
Multiply the number of kilograms by 1000000. To go back the other way, multiply milligrams by 0.000001.
What is 10 kilograms in milligrams?
10 kilograms = 10000000 milligrams. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.
Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.