# What is the SI Unit of Weight?

By Mandeep Kumar|Updated : July 16th, 2022

The SI Unit of weight is Kilogram (kg). SI Unit is a standard unit defined by the International System of Units for measurement. It is a globally agreed system of measurement.

## Answer: Kilogram (kg) is the SI unit of weight.

The kilogram is a unit to measure mass in the International System of Units. It is represented by the symbol “kg”. One Kilogram is equal to one thousand grams. The word kilogram has been derived from the ‘French’ word kilogramme. It is defined in the three fundamental physical constants, they are Planck constant, speed of light, and specific atomic transition frequency. It was first defined in 1795 as the mass of one litre of water. The unit is widely used in different fields like engineering, science, commerce, etc.

Summary:

## What is the SI Unit of Weight?

The SI unit of weight is Kilogram (kg). It is a unit of mass. Apart from Kilogram, Meter, Second, Mole, Kelvin, Candela, and Ampere are the other units.