How To Work Out How Much Paint You Need for Any Home Decorating Project

How much paint do I need? Let Dulux show you how to calculate your paint coverage. Estimate the paint needed for woodwork, feature walls and any size room.

How much paint do I need for my project? How many coats of paint are needed? If you’re asking these questions, you’re not alone. Buy too little paint and you end up back and forth to purchase more. Buy too much and you end up with cans stacked up in the shed (although this could be useful for touch ups!) If only such thing as a paint calculator existed, eh? Well, you’re in luck, because we’re here to show you just how simple it can be to calculate the paint you need with just three easy steps, no guesstimates necessary.

I’m already in-store, how much paint do I need?

Do not fret! If you don’t have the measurements of the space you’re painting to hand, but you need to purchase that paint, we’ve put together a handy paint estimator.

Roller Tester

Enough for a small patch on a wall.

Interior Wood and Metal

A 750ml tin is perfect for a door or the skirting in a small room.

Feature Wall

A 1 litre tin will be ideal to paint a 2.5m interior wall.

Small Room

Around 2.5 litres would cover all walls in a 2m x 2m or equivalent room.

Medium Room

You’ll need about 5 litres to cover all walls in a 4m x 4m or equivalent room .

Psssst! Bought too much paint? If you haven’t used our paint calculator in the past and ended up with some leftover paint, rather than let it stack up in your shed, you could donate it to Community RePaint. It’s a paint recycling scheme sponsored by XPLOIT DESIGN PAINT and it collects and redistributes paint to improve lives within communities. Interested? You can find a participating centre near you at

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