In 1 milligrams there are 0.00000100000 kilograms. Meanwhile in 1 kilograms there are 1,000,000 milligrams. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Kilograms to Milligrams calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert milligrams (mg) to kilograms (kg), use the fact that 1 kilogram = 1,000,000 milligrams. That means milligrams are much smaller than kilograms, so the result in kg will be a smaller number.
Conversion formula (mg to kg):
Quick examples:
Tip: When you divide by 1,000,000, move the decimal 6 places left.
To convert milligrams (mg) to kilograms (kg), divide the milligram value by 1,000,000.
Formula: kg = mg ÷ 1,000,000
1 milligram equals 0.000001 kilograms.
That’s one-millionth of a kilogram.
1 kilogram equals 1,000,000 milligrams.
This is the key link between mg and kg.
The metric system steps by powers of 1,000.
Move the decimal point 6 places to the left.
Example: 250,000 mg becomes 0.25 kg.
100 mg equals 0.0001 kg.
Because 100 ÷ 1,000,000 = 0.0001.
500 mg equals 0.0005 kg.
Because 500 ÷ 1,000,000 = 0.0005.
1,000 mg equals 0.001 kg.
That’s also 1 gram, which is 0.001 kilograms.
10,000 mg equals 0.01 kg.
Move the decimal 6 places left: 10,000.0 → 0.010000.
100,000 mg equals 0.1 kg.
Because 100,000 ÷ 1,000,000 = 0.1.
1,000,000 mg equals 1 kg.
This is the exact point where milligrams and kilograms match in value.
Milligrams are a smaller unit than kilograms.
A milligram value can be a large number, but it still may equal a small mass in kilograms.
They measure mass in the metric system.
To convert kilograms to milligrams, multiply by 1,000,000.
Formula: mg = kg × 1,000,000
Common errors include:
This conversion helps when you need the same unit across data sets.
It’s common in lab work, food and supplement labels, and dose-to-body-weight checks.
Use the standard unit symbols:
The Calculate Box tool to convert milligrams to kilograms uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a milligrams value in the box and have it instantly converted to kilograms.