Learning to calculate litres of paint per square meter is a calculation that can be used to determine the expected coverage of a certain type of paint. Coverage will vary by paint brand and by the type of paint. You can normally find the information about the expected coverage for a particular paint on the paint can. Therefore, by calculating the square meter measurement of your painting project, you can determine the number of litres of paint that you will need to buy.

Use the tape measure to measure the length and width in meters of the space you want to paint.

Multiply the meter measurements to determine the area of the space you want to paint. For example, if the width of the wall is 5 meters and the length of the wall is 3 meters, the area of the wall is 15 square meters.

Read the label on the paint can to determine the expected coverage of the paint in square meters. For example, assume the paint can lists an expected coverage of 12 square meters.

Divide the area measurement from Step 2 by the expected coverage from Step 3. Continuing the same example, "15 / 12 = 1.25". So, it will take 1.25 litres of paint to paint the wall in the example.