Interactive Schooling
Register Now!

Search Skwirk


The basic unit for the measurement of length is the metre. When mass (the weight of something) is being measured, the basic unit of measurement is the kilogram. A kilogram (kg) is 1 000 grams (g).

The gram is used to measure small weights, and the tonne (t) is used for larger weights: 1 000 g = 1 kg and 1 000 kg = 1 tonne.


A gram is one thousandth of a kilogram (0.001 kg). Things which might have a mass of a single gram include items such as a paperclip or a marble. One millilitre of water (a cubic centimetre of it) also has a mass of 1 gram.

Some comparative gram amounts



1 g

a marble

50 g

a small box of powdered soup

375 g

a small tub of margarine
850 g a tin of canned fruit
950 g a large box of breakfast cereal
1 000 g half a dozen large apples
5 000 g a large bag of potatoes








See animation

The relationship of the millilitre to the cubic centimetre

One litre (1 000 mL) is the amount of water that would have a mass of exactly 1 kilogram (1 000 g). A single millilitre has a mass of 1 gram and occupies the space of 1 cm3.

Converting grams to kilograms (g kg)

As there are 1 000 grams in a kilogram, to convert g to kg is simply a matter of dividing by 1 000. This means moving the decimal point 3 places to the left.


8 000 g 8 000 1 000 8 kg
6500 g 6 500 1 000 6.5 kg
454 g 454 1 000 0.454 kg

Converting kilograms to grams to (kg g)

As a kilogram equals 1 000 grams, to convert kg to g is simply a matter of multiplying by 1000. This means moving the decimal point 3 places to the right.


6 kg 6 x 1 000 6 000 g
8.7 kg 8.7 x 1 000 8 700 g
0.049 kg 0.049 x 1 000 49 g

Several different notations for expressing mass

Masses involving grams and kilograms can be written in a number of different notations. They may be written as quantities:

i) in grams
ii) in both grams and kilograms, or
iii) in kilograms, using decimal notation.


2 365 g

1 800 g

450 g

84 g

kilogram and gram

2 kg 365 g

1 kg 800 g

450 g

84 g

Decimal notation (kg)

2.365 kg

1.800 kg
or 1.8 kg

0.450 kg
or 0.45 kg

0.084 kg


Other Chapters

  1. Mass
  2. Kilograms
  3. Tonnes

Chapters: Mass Kilograms Tonnes

Pop Quiz

The more you learn - the more you earn!
What are points?Earn up to points by getting 100% in this pop quiz!

Question 1/5

1. If a Butcher's scales showed the following mass on its display, how many 40 g slices of ham would need to be removed to exactly equal one kilogram?

3 slices

7 slices

5 slices

9 slices