What are units of weight ((mass) ?

What Are Units Of Weight ((mass) ?

This site is offering a detailed note of different units of weight (mass) and a variety of converters to change these units into each other. But before moving towards details of these units you should be aware that, in terms of Physics, weight and mass are different quantities, these have different definitions, properties and measuring units but in daily life use, both these quantities are taken as alternatives to each other. Let's take look at the difference between both quantities. 


Difference b/w Weight and Mass

Mass is the total quantity of matter enclosed by a body or thing, the SI unit of mass is 'kilogram (kg)'. 

Weight is a quantitative measure of the force exerted by a body towards a gravitational centre, the SI unit of weight is ' Newton (N) '.


Both are physically different. Mass of the body is always constant irrespective of physical conditions while weight changes in changing physical conditions. e.g mass of a body will be the same on earth, moon or in space. While the weight changes under different conditions e.g the weight of a body will be reduced to one-sixth on the moon as compared to its weight on earth and will become zero in space where there is no gravitational force acting on the body.


But on earth weight & mass of a body are taken as the same. Here we will discuss different traditionally used customary units as well as SI units of weight/mass. SI (System International) is the international organization that set and regulates units of measurement for different quantities at the international level. 


Customary Units

There had been plenty of different scales & units for the measurement of different things. Different regions and countries of the world use to measure different things with different methods and measuring parameters. The customary and traditional imperial measuring units of weight that are still used in the US, UK, commonwealth, & other European states & countries include pound, ounce, and stone. 


It is a customary unit of weight/mass used in the USA, British Imperial, and many other European countries. It is denoted as ' lb ' which short form for its Roman origin 'libra'. Though this unit of weight is not supported by SI, it is still in use. A pound weighs 453.59237 grams. A pound is divided into smaller entity ' Ounce '. An ounce is 1/16 part of a pound. In kilogram, the weight of a pound is 0.4536 kg only. 

Ounce Pound


The ounce is a smaller entity of pound for measuring the weight of things with little weight. An ounce is the sixteenth part of a pound and is a traditionally used customary unit. It is denoted with 'oz' which is taken from the Medieval Italian word 'Onza'. An ounce is equal to 1/16 pounds and in grams, it weighs 28.34952 grams only.



It is a traditional used conventional unit usually used to assess the weight of the human body in Australia, the USA, the UK etc. It is denoted by ' st '. The weight of a stone in kg is 6.35kg while in pounds a stone weighs 14 pounds. 

System International

SI unit of Weight(mass)

SI (System International) also referred to as ISQ (International System of Quantities) was established in the year 1960. It is an international organization of experts & scientists to define international measuring units of different quantities. The SI unit of weight(mass) is the kilogram and is denoted by 'kg'. A kilogram is equal to 1000 grams. Along with kilogram, other smaller entities of weight units i.e grams(g), milligrams (mg), micrograms (µg) as well larger entities e.g tons & metric tons are also used for measurement of weight. 

1 kg is equal to 1000 grams ( 1kg x 1000 = 1000 g)

1 gram is equal to 1000 mg ( 1g x 1000 = 1000 mg)

1 mg is equal to 1000 µg   ( 1mg x 1000 = 1000 µg)

1 ton is equal to 1000 kg    ( 1ton x 1000 = 1000 kg)


Weight Unit Conversion

Our site offers a huge variety of lighting fast easy to use and instant weight converters which are able to interconvert various units of weight into each other without requiring a calculator or any other app. The units that can be interconverted here include micrograms, grams, milligrams, kilograms, tons, pounds, ounces, & stones.


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