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.