Follow these simple steps to help measure up your room and calculate the perfect amount of paint you need for your walls:

Calculating the overall room measurement
  1. Width x height of walls
    =Overall room measurement
Calculating overall door and window measurement
  1. Width x height of doors and windows
    =Overall door and window measurement

  2. Overall room measurement – Overall door and window measurement
    =Wall space to be painted

  3. Wall space x 2 (for two coats) + a little for touch ups
    =Total

  4. Total / m² / l number on your paint tin
    =Number of litres of paint you need for your project

What you’ll need:

Measure up your space to calculate the perfect amount of paint for your walls
  • A metal tape measure
  • A step ladder
  • Pen and paper
  • Calculator

Using the right painting technique will not only mean you achieve a more professional finish but will also help your paint go further: Tips to help you do more with less paint.

Before setting out to buy your paint, have a read of our guide to the ultimate painting tool kit: Our guide to rollers, brushes and extra kit.