Tools and Units for Mass
Lesson
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Metric Units of Mass 

Mass is the amount of matter that makes up an object.

 Gram (g) is a metric unit used to measure the mass of small objects.

 Kilogram (kg) is equal to 1,000 grams, so it is used to measure the mass of larger objects.

 

 

A paperclip has a mass of about 1 gram

A book has a mass of about 1 kilogram

 

Metric Units of Mass

 

Name

Abbreviation Number of Base Units Approximate Comparison  
Gram g 1

mass of a small grape

 
Kilogram kg 1,000

mass of a cantaloupe

 

 

Conversions

The chart above shows the relationships between the units of grams and kilograms. You can use the chart to change a measurement from one unit to another unit.
How many grams are in a 3 kilograms? You can change from kilograms to grams by multiplying.
3 kg=  ___ g Think: 1 kg = 1000 g
3 x 1000 = 3000 3 kg = 3000 grams
How many grams are in 5,000 kg? You can change from grams to kilograms by dividing.
5000 g = ___ kg Think: 1000 g = 1 kg
5000 divided by 1000 = 5  5000 g = 5 kg


Remember:

To measure an object that has a small mass, use grams

To measure an object that has a larger mass, use kilograms.

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Created by Carol Carroll
Updated by Nicole Freebern
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