Convert mg to kg
Convert mg to kg instantly. 1 mg = 0.000001 kg. Formula, worked examples and a quick reference table.
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One milligram equals 0.000001 kilograms. To convert any number of milligrams to kilograms, multiply by 0.000001.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Weight and mass conversions matter most in three places: shipping, where a rate band can turn on a single kilogram; cooking, where recipes cross between metric grams and imperial ounces; and personal weight, where Britain and Ireland use stones, the United States uses pounds, and everywhere else uses kilograms. Strictly these are mass units rather than weight units, and the distinction only bites in physics, where weight is a force measured in newtons.
mg to kg formula
To go the other way, use milligram = kilogram ÷ 0.000001.
About these units
The milligram is a thousandth of a gram, and the standard unit for medicine doses and nutrition labels, where the quantities are far too small for grams to be readable.
Since 2019 the kilogram has been defined by the Planck constant rather than a metal cylinder in Paris, making it reproducible in any properly equipped laboratory.
Milligram is also written milligramme and milligrams. Kilogram is also written kilogramme, kilogrammes, kilograms, kilos, kilo and kgs.
Sources
mg to kg conversion table
| Milligram | Kilogram |
|---|---|
| 1 mg | 0.000001 kg |
| 2 mg | 0.000002 kg |
| 3 mg | 0.000003 kg |
| 5 mg | 0.000005 kg |
| 10 mg | 0.00001 kg |
| 20 mg | 0.00002 kg |
| 25 mg | 0.000025 kg |
| 50 mg | 0.00005 kg |
| 100 mg | 0.0001 kg |
| 250 mg | 0.00025 kg |
| 500 mg | 0.0005 kg |
| 1,000 mg | 0.001 kg |
Frequently asked questions
How many kilograms are in a milligram? +
There are 0.000001 kilograms in one milligram.
What is 10 mg in kg? +
10 mg equals 0.00001 kg. Multiply 10 by 0.000001.
How do I convert kilogram back to milligram? +
Use milligram = kilogram ÷ 0.000001. The converter above handles both directions, or see our dedicated kg to mg page.
How accurate is this milligram to kilogram conversion? +
The factor used is 0.000001, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate mg to kg in my head? +
The factor is exactly 0.000001, which is short enough to apply directly without an approximation.