# Convert Milligram to Kilogram

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

### Milligram

**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.

### Kilogram

**Definition:** A kilogram (symbol: kg) is the base unit of mass in the International System of Units (SI). It is currently defined as being equal to the mass of the International Prototype of the Kilogram (IPK), a cylinder made of a platinum-iridium alloy.

**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. The current definition of a kilogram, defined as being equal to the mass of a physical prototype, is still imperfect. 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 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.

**Possible future changes:** The definition of some SI base units may change in the near future. The International Committee for Weights and Measures (CIPM) has proposed re-definition of some of the SI base units in an attempt to further improve the system. Although the definitions of some units may change, the actual size of the units would remain the same; the change in definition will not have much, if any, effect on the daily use of these units.

The kilogram is one of the SI units being considered for re-definition. The current definition is based on the mass of a physical prototype which has been seen to change over time. Although the measured change is relatively small (50 micrograms), having a standard of measurement that changes at all is undesirable. As such, the proposed re-definition of the kilogram seeks to make the kilogram a measurement based on a constant of nature, rather than a physical standard that is subject to change.

If the formal vote to change the definition passes, the kilogram will instead be based on Planck's constant. This change would tie the definition of the kilogram to that of the second and the meter. Even though this would change the definition of the kilogram, the actual size of the unit will remain the same. The proposed changes are intended to improve the definitions of SI base units, not to actually change how the units are used throughout the world.

### Milligram to Kilogram Conversion Table

Milligram [mg] | Kilogram [kg] |
---|---|

0.01 mg | 1.0E-8 kg |

0.1 mg | 1.0E-7 kg |

1 mg | 1.0E-6 kg |

2 mg | 2.0E-6 kg |

3 mg | 3.0E-6 kg |

5 mg | 5.0E-6 kg |

10 mg | 1.0E-5 kg |

20 mg | 2.0E-5 kg |

50 mg | 5.0E-5 kg |

100 mg | 0.0001 kg |

1000 mg | 0.001 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