kg to g

There are 0.001 kilograms (kg) in 1 gram (g). They are both measurements of mass/weight in the metric system of measurement. The kilogram is the base unit of mass in the International System of Units (SI).

The gram used to be part of a different system of measurement, the centimetre-gram-second system of units, and was defined based on the weight of a specific volume of pure water under certain conditions. Now however, it is defined in terms of the kilogram, as being one-thousandth of a kilogram.

Kilograms to grams converter

The following converter can be used to convert from kilograms to grams or grams to kilograms. Just enter a value in either kilograms or grams to convert between the two.


How many kg in a g

There are 0.001 kilograms in 1 gram:

1 g = 0.001 kg

How many grams in a kilogram

There are 1,000 grams in 1 kilogram:

1 kg = 1,000 kg

Kilograms to grams conversion

To convert kilograms to grams, multiply a value in kilograms by 1,000. To convert grams to kilograms, divide a value in grams by 1,000.

kg to grams formula

The formula to convert kilograms to grams is:


Below are two examples: a kg to g example and a g to kg example.


1. Convert 22 kilograms to grams:

22 kg × 1000 = 22000 g

2. Convert 172 grams to kilograms:

172 g ÷ 1000 = 0.172 kg

What is a kg

A kilogram is a measurement of mass in the International System of Units (SI). It is the base unit of length in SI, which means that other SI measurements of mass are related to the kilogram by a given power of 10 as indicated by the prefix (e.g. centi- indicates 1/100).

Kilogram definition

A kilogram is defined based on three fundamental physical constants:

This definition of the kilogram remains consistent with previous definitions such that the mass is 30 ppm of the mass of one liter of water.

Kilogram history

The kilogram (kg) was derived from the French kilogramme. In 1794, it was defined as the mass of one liter of water at its freezing point. Its definition has changed over the course of history, and in 1899 it was based on a physical prototype: a cylinder made of platinum and iridium. This definition of the kilogram remained until 2019 when it was redefined based on the fundamental physical constants described above. The changes to the definition of the kilogram were all made in an effort to make its definition more robust; even though the physical prototype served well and remained largely unchanged, it was and is still subject to some changes, while the fundamental physical constants are by definition constant.

Kilogram usage

As the base unit of mass in the International System of Units (SI, the kilogram is widely used throughout the world. With the exception of the United States, Myanmar, and Liberia, which have not yet adopted SI as the official system of measurement, all other countries around the world use SI, and therefore the kilogram. Even though the US, Myanmar, and Liberia have not officially adopted SI, it is still also used alongside the local systems of measurement in areas such as science, industry, government, and the military.

The kilogram is used in everyday life to measure things such as a person's weight as well as the weight of medium to large objects. It is not really used to measure small objects since other more apt measurements such as the gram exist.

What is a gram

A gram (g) is a measurement of mass in the International System of Units (SI). It is related to the kilogram, the SI base unit of mass, by a factor of .

Gram definition

The gram is defined as of a kilogram, the base unit of mass in SI.

Gram history

The gram used to be defined as the absolute weight of 1 cubic centimeter of pure water at the temperature of melting ice. It was used as the fundamental unit of mass in the centimeter-gram-second system of units, one of the metric predecessors to the International System of Units. After the widespread adoption of SI, the kilogram became the base unit of mass instead, and the gram was redefined as one-thousandth of a kilogram.

Gram usage

The gram is widely used in everyday life for purposes such as cooking and weighing smaller objects like apples, flour, books, and more. If you look at the nutrition label on just about anything in a grocery store, values are commonly expressed in grams, such as the number of grams of sugar, protein, fat, etc.

Kilogram to gram conversion table

The table below shows various kilogram to gram conversions.

Kilogram Gram
0.01 10
0.1 100
1 1,000
2 2,000
3 3,000
5 5,000
10 10,000
20 20,000
50 50,000
100 100,000
1,000 1,000,000