Unit of Weight – Class 11 | Chapter – 2 | Physics Short Notes Series PDF for NEET & JEE

Unit of Weight: The unit of weight is typically expressed in force or mass. In the SI (International System of Units) system, the standard unit for mass is the kilogram (kg), while the standard unit for force is the Newton (N). However, in common usage, weight is often measured in units such as pounds (lb) or ounces (oz) in the imperial system or in units such as grams (g) or kilograms (kg) in the metric system. It’s important to note that weight and mass are not the same thing, and weight is the force exerted on an object due to gravity and depends on the object’s mass and the strength of the gravitational field. Weight is expressed as:

w = mg


  • w: Weight of the Body
  • m: Mass of the Body
  • g: Acceleration due to Gravity

SI Unit of Weight

SI units are the standard measurement units that are defined by the International System of Units

The SI Unit of Weight is Newton (N)

  • Weight is considered to be a force acting on an object
  • Therefore, the units of Weight and Force are the same
  • Since force is measured in Newtons, the unit of weight is also Newton (N)
  • The SI unit of weight is measured in kg m/s2 which is equal to a newton (N)

Other Units of Weight

Weight can also be measured in various other units apart from its standard unit Newton. Here are the alternative units of weight:

Dimensional Unit of Weight

The dimensional unit of weight is the product of mass, distance, and time and is expressed as MLT-2.


  • M refers to Mass.
  • L refers to Distance.
  • T refers to Time. 

CGS Unit of Weight

  • CGS unit refers to centimeter-gram-second.
  • The CGS unit of weight is Dyne, where weight becomes 1 g cm s-2.
  • 1 Dyne = 1 Newton / 10000

Base Unit of Weight

  • The base unit of weight has the same value as that of the SI unit of weight.
  • Thus, the base unit of weight is kg m/s2

Apart from them, some other units of weight are pound-force (lbf), slug, and gram.

Metric Conversion of Units of Weight

Gram is one of the most widely accepted units of weight. The units of weight can be converted using the standard denominations mentioned below:

  • 1 g = 0.001 kg
  • 1 mg = 0.000001 kg = 0.001 g
  • 1 centigram = 0.00001 kg = 0.01 g
  • 1 metric ton = 1000 kg


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By Team Learning Mantras