Measurement Units – Definition with Examples

Measurement Units

Measurement is to find a number that shows the amount of something. A measurement unit is a standard quantity used to express a physical quantity. Let us learn about the physical quantities and some of the standard units used to measure them.


Length describes how long a thing is from one end to the other.

Metric UnitUS Standard Unit (English Unit or Customary Unit)

Millimeter (mm)

Used to measure very short lengths or thicknesses.

Example, length of a pencil tip.


Centimeter (cm):

Used to measure small lengths.

Example: Length of a pencil.


Meter (m):

Used to measure big lengths.

Example: Length of a classroom.


Kilometer (km):

Used to measure very long lengths or distance.

Example: Distance between two places.

Inch (in):

Used to measure the length of small objects.

Example: Length of a bed.


Foot (ft):

Used to measure short distances and heights.

Example: Heights of buildings.


Yard (yd):

It is bigger than a foot.

Example: Length of a football field.


Mile (mi):

Used to measure long distances.

Example: Distance between two places.



The amount of matter a thing consists of is its weight.

Metric UnitUS Standard Unit (English Unit or Customary Unit)

Milligram (mg):

Used to measure very light things.

Example: Medicines


Gram (g): 

Used to measure small things.

Example: Potato


Kilogram (kg): 

Used to measure heavy things.

Example: Body weight

Ounce (oz): 

Used to measure small quantities.

Example: Bread.


Pound (lb): 

Used to measure body weight, etc.



Used to measure much heavier things.

Example: Trucks

weight metric
weight example

Capacity (Volume)

Capacity is how much quantity a container can hold.  

Metric UnitUS Standard Unit (English Unit or Customary Unit)

Milliliter (ml):

Used to measure very small quantities.

Example: Medicines.


Liter (l): 

Used to measure liquids.

Example: juice, milk





example capacity


The ongoing sequence of events is time.

Metric Units and US Standard Unit are the same for the time

Second (s)

Minute (min)

Hour (hr)






  Fun Fact

  • Long before the standard units of measurement were made, non-standard units such as a digit, handspan, and pace were used.