Paint Calculator
Work out how much paint a room needs from the wall area, the coverage printed on the tin and the number of coats you plan to apply.
Wall calculators
Everything that covers a wall: wall area, paint, wallpaper, plaster and putty. Start from the wall area and reuse it across the other calculators.
What you can calculate here
- Gross and net wall area with doors and windows deducted.
- Paint volume by coverage rate and number of coats.
- Wallpaper rolls, plaster and putty quantities by layer thickness.
Wall calculators
Wallpaper Calculator
Estimate how many rolls of wallpaper a room needs from the wall area, the roll size and an allowance for pattern matching.
Plaster Calculator
Calculate how much plaster or render a wall needs, based on the net wall area, the layer thickness and the consumption printed on the bag.
Wall Putty Calculator
Estimate filler and skim coat quantities for a wall from its area, the coat thickness and how many coats you will apply.
Wall Area Calculator
Get the wall area of a room with doors and windows deducted. This is the number that paint, wallpaper, plaster and putty calculators all build on.
Wall questions
Should I deduct doors and windows?
Yes for paint and wallpaper. Keep a small allowance: the reveal and frame edges are usually painted or papered too.
Where do I get the coverage rate?
It is printed on the paint tin or the plaster and putty bags. Coverage varies a lot between products, so use your own product's figure.