Paint Calculator: How much paint do I need?

There’s nothing worse than getting halfway through a decorating project and realising you haven’t got enough paint. By calculating how much you need beforehand, you’ll save yourself a lot of time, effort, and money. To begin, all you'll need is a measuring tape to determine the length and width of your walls. We'll do the rest! Let's get started.

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Paint Calculator Tool

Use our Paint Calculator to get an accurate number in seconds. All you’ll need to do is measure the width and height of your walls and we’ll do the rest. You may want to subtract the space taken up by windows and doors, but keep in mind that you'll probably want some paint left over for touch-ups.

Just click on the image below:


Tips for using our tool

  • Number of Coats:

2 coats of paint is sufficient for typical projects.

The required number of coats of paint can vary depending on the project. Porous walls, as well as walls undergoing dramatic colour transformations, are likely to require additional coats. That being said, using the right primer can help to reduce the number of coats required.

(Top tip: We recommend tinting your primer to the same shade as your topcoat for the best opacity of colour in fewer coats).

  • Paint Coverage:

Most of our paints have a coverage of around 10sqm per litre.

Please refer to the Technical Data Sheets (or TDS) in the product attachments section of each online product page for accurate coverage.


painting process images, masking tape to stirring tin to applying paint to wall with brush


How to calculate how much paint you need

  1. Measure your space: You’ll need to measure the maximum height and width of your walls and then multiply the two together to figure out the overall square metre measurement. Not great with a tape measure? A loose and simple guideline is to "step it out" – one step for an adult is about 1m, so start by standing against one wall and pacing out to the opposite wall.
  1. Remember your windows and doors: Obviously your windows and doors take up space so you need to account for this too. Measure them both, times the number together to get the square metre and then subtract this from your overall square meterage.
  1. How many coats do you need? The amount of paint you’ll need is also influenced by the number of coats you’re using. We recommend using two coats across the majority of our Interior Paints to achieve a beautifully deep colour. What does this mean for your calculations? Simply multiply your square metres by two.
  1. A little bit more maths: Finally, take your total number and divide it by the metre squared per litre on your tin. In the case of our paints, that’s 10m2. Don’t forget to account for touch ups or ‘just in case’ scenarios.

And voila! You’ve got the amount of paint you’ll need to finish your decorating.


Before you start painting...

When painting a room, begin with the ceiling, then the walls, then the doors/windows, and finally the skirting boards.

Follow our instructions for preparing your walls for painting.


Need more help?

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Paint Calculator

How much paint do I need? 

Use this calculator to work out your requirements, if you have any question please get in touch with one of our team who will be more than willing to help you.

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Tell us about your paint choices

Disclaimer: Tikkurila UK Paint Calculator is provided as a guide only. The coverage rates will vary depending on surface being coated and the particular product range being used. More information on these products can be found on the cans, on the technical data sheets on individual product pages, by using our live chat service or by calling our technical team on 0131 334 4999.

Every effort has been made to ensure the accuracy of the estimate, however paint requirements may vary depending on the surface, type of paint, sheen level and colour chosen.