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Data from official sources · Made in Argentina

Paint calculator

Enter the length and height of the walls (or the area directly), what doors and windows take up, and how many coats you'll apply.

It adds 10% extra so you don't run out halfway through.

What measurements do you have?

All the walls you'll paint added together. For a room, the perimeter.

A door is about 21 ft² (2 m²) and a standard window 10 to 20 ft².

It's on the tin: how much area it covers per coat. If you don't know, keep the suggested value.

How it's calculated

  1. Area = total wall length × height, minus doors and windows.
  2. Paint = area × coats ÷ coverage.
  3. It then adds a 10% margin.

An example

A room with 14 m of walls, 2.6 m high, and 4 m² of doors and windows has 32.4 m² to paint.

With 2 coats and paint that covers 10 m² per litre, you need 6.48 litres. With the margin, 7.13 litres.

Frequently asked questions

How much does a gallon of paint cover?

Most interior wall paint covers about 350 to 400 ft² per gallon per coat (8 to 12 m² per litre). The exact figure is on the tin.

How many coats do I need?

Two coats is standard. New plaster, very porous walls or a big colour change may need a third.

Should I leave out doors and windows?

Yes, if they are large. It is better not to subtract small ones: the extra covers edges and cutting in.

Key terms

Coverage
How much area a litre or gallon of paint covers in one coat.
Coat
Each layer of paint applied to the wall.

The same calculation in other countries

Up-to-date official data

We check the official sources automatically, every day.

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