Home / Weight and Mass Conversion / Convert Milligram to Kilogram

Convert Milligram to Kilogram

Please provide values below to convert milligram [mg] to kilogram [kg], or vice versa.



Definition: A milligram is a unit of weight and mass that is based on the SI (International System of Units) base unit of mass, the kilogram. It is equal to 1/1,000 grams, or 1/1,000,000 kilograms.

History/origin: The milligram is based on the SI unit of weight and mass, the kilogram. As an SI unit, it uses the "milli" SI prefix to denote that it is a submultiple of the base unit. Although the "milli" prefix denotes a submultiple with respect to the gram, the kilogram, not the gram, is technically the SI base unit of mass.

Current use: As a submultiple of an SI base unit, the milligram is widely used in many applications, from everyday use to measure the weight or mass of foods, substances, etc., to widespread use in scientific labs, among other areas.


Definition: A kilogram (symbol: kg) is the base unit of mass in the International System of Units (SI). It is currently defined based on the fixed numerical value of the Planck constant, h, which is equal to 6.62607015 × 10-34 in the units of J·s, or kg·m2·s-1. The meter and the second are defined in terms of c, the speed of light, and cesium frequency, ΔνCs. Even though the definition of the kilogram was changed in 2019, the actual size of the unit remained the same. The changes were intended to improve the definitions of SI base units, not to actually change how the units are used throughout the world.

History/origin: The name kilogram was derived from the French "kilogramme," which in turn came from adding Greek terminology meaning "a thousand," before the Late Latin term "gramma" meaning "a small weight."

Unlike the other SI base units, the kilogram is the only SI base unit with an SI prefix. SI is a system based on the meter-kilogram-second system of units rather than a centimeter-gram-second system. This is at least in part due to the inconsistencies and lack of coherence that can arise through use of centimeter-gram-second systems, such as those between the systems of electrostatic and electromagnetic units.

The kilogram was originally defined as the mass of one liter of water at its freezing point in 1794, but was eventually re-defined, since measuring the mass of a volume of water was imprecise and cumbersome.

A new definition of the kilogram was introduced in 2019 based on Planck's constant and changes to the definition of the second. Prior to the current definition, the kilogram was defined as being equal to the mass of a physical prototype, a cylinder made of a platinum-iridium alloy, which was an imperfect measure. This is evidenced by the fact that the mass of the original prototype for the kilogram now weighs 50 micrograms less than other copies of the standard kilogram.

Current use: As a base unit of SI, the kilogram is used globally in nearly all fields and applications, with the exception of countries like the United States, where the kilogram is used in many areas, at least to some extent (such as science, industry, government, and the military) but typically not in everyday applications.

Milligram to Kilogram Conversion Table

Milligram [mg]Kilogram [kg]
0.01 mg1.0E-8 kg
0.1 mg1.0E-7 kg
1 mg1.0E-6 kg
2 mg2.0E-6 kg
3 mg3.0E-6 kg
5 mg5.0E-6 kg
10 mg1.0E-5 kg
20 mg2.0E-5 kg
50 mg5.0E-5 kg
100 mg0.0001 kg
1000 mg0.001 kg

How to Convert Milligram to Kilogram

1 mg = 1.0E-6 kg
1 kg = 1000000 mg

Example: convert 15 mg to kg:
15 mg = 15 × 1.0E-6 kg = 1.5E-5 kg

Popular Weight And Mass Unit Conversions

Convert Milligram to Other Weight and Mass Units

milligrams to grams
Milligram to Ton (metric)
Milligram to Pound
Milligram to Ounce
Milligram to Carat
Milligram to Ton (short)
Milligram to Ton (long)
Milligram to Atomic Mass Unit
Milligram to Break
Milligram to Exagram
Milligram to Petagram
Milligram to Teragram
Milligram to Gigagram
Milligram to Megagram
Milligram to Hectogram
Milligram to Dekagram
Milligram to Decigram
Milligram to Centigram
Milligram to Microgram
Milligram to Nanogram
Milligram to Picogram
Milligram to Femtogram
Milligram to Attogram
Milligram to Dalton
Milligram to Kilogram-force Square Second/meter
Milligram to Kilopound
Milligram to Kip
Milligram to Slug
Milligram to Pound-force Square Second/foot
Milligram to Pound (troy Or Apothecary)
Milligram to Poundal
Milligram to Ton (assay) (US)
Milligram to Ton (assay) (UK)
Milligram to Kiloton (metric)
Milligram to Quintal (metric)
Milligram to Hundredweight (US)
Milligram to Hundredweight (UK)
Milligram to Quarter (US)
Milligram to Quarter (UK)
Milligram to Stone (US)
Milligram to Stone (UK)
Milligram to Tonne
Milligram to Pennyweight
Milligram to Scruple (apothecary)
Milligram to Grain
Milligram to Gamma
Milligram to Talent (Biblical Hebrew)
Milligram to Mina (Biblical Hebrew)
Milligram to Shekel (Biblical Hebrew)
Milligram to Bekan (Biblical Hebrew)
Milligram to Gerah (Biblical Hebrew)
Milligram to Talent (Biblical Greek)
Milligram to Mina (Biblical Greek)
Milligram to Tetradrachma (Biblical Greek)
Milligram to Didrachma (Biblical Greek)
Milligram to Drachma (Biblical Greek)
Milligram to Denarius (Biblical Roman)
Milligram to Assarion (Biblical Roman)
Milligram to Quadrans (Biblical Roman)
Milligram to Lepton (Biblical Roman)
Milligram to Planck Mass
Milligram to Electron Mass (rest)
Milligram to Muon Mass
Milligram to Proton Mass
Milligram to Neutron Mass
Milligram to Deuteron Mass
Milligram to Earth's Mass
Milligram to Sun's Mass