1. Calculate the surface area of the walls in the room

• Multiply the length of the wall by the height of the ceiling.

• Subtract for any doors or windows

Example: A wall that’s 4 metres long with a 3-metre-high ceiling has a wall surface area of 12 sqm

2. Calculate the paint usage

• Divide the overall surface area of the wall to be painted by 6. A 12 sqm surface area, e.g. needs 2 litres of paint.

• Sweet! The figures you come up with show how many litres of wall paint you need