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How to Calculate Paint Quantities

25th October 2018

We answer the question: how much paint do I need? with our guide on how to calculate paint quantities.

Working out your requirements for paint allows you to keeps costs down and it ensures continuity of colour. Take a look at our step-by-step instructions for working out how much paint you need...

1. Measure Your Room

First, you will need to measure each wall you wish to paint. Use a metal ruler to measure the width and height in metres, then multiply each wall's width by its height.

Example:

Wall size: Height: 1.2m x Width: 2.4m = 2.88 square metres.

Take all the results from each wall you wish to paint and add them together. This will calculate the overall square metre measurement.

How to Calculate Paint Quantity
How to Calculate Paint Quantity

2. Subtract Windows and Doors

If you have large spaces that aren’t being painted, you should subtract this from your current total. This includes windows, doors and/or fireplaces.

Use the same calculation method as above to work out the total area. Then subtract it from your previous overall total.

Example: 

Window size: Width: 0.35m x Height: 0.60m = 0.21 metres.

Wall total: 2.88m – 0.21m = 2.67 square metres.

3. Factor in the Coats of Paint

Multiply your new total square metre measurement by the number of coats you’ll need. We recommend applying at least two coats and it's also worth including a little extra paint for touch ups.

Example:

Two coats x 2.67m = 5.34 square metres.

How to Calculate Paint Quantity
How to Calculate Paint Quantity

4. Calculate Your Total

Finally, divide this total figure by the m²/l number on your paint tin. This will give you the total litres of paint you need for your project.

Now you know how to calculate paint quantity for any room.

Shop Designer Paint at F&P Interiors

You can order your designer paint, paint card or sample pots through the website. We offer FREE DELIVERY on all paint orders to a UK delivery address.

Need some extra paint at the last minute? Don't worry - order before midday Monday – Thursday and we can organise a next day delivery for you.

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We supply paint from some of the industry's most prestigious producers. These include Farrow & Ball, Little Greene and Zoffany. Shop now.

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How to Paint a Room

Calculated your paint quantities? Chosen your colours? All set to go? Grab your paintbrush and take a look at our simple guide to painting a room. We cover everything you need to produce results that will make you proud.

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