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The Colour Supplement
Home » Inspiration » How much paint do I need? A guide to calculating paint quantities

How much paint do I need? A guide to calculating paint quantities

Before starting a decorating project, one of the most important questions to answer is: how much paint will I need?

Ordering too little can mean running out halfway through, while buying more than you need can leave you with unnecessary leftovers.

Fortunately, working out how much paint to order is relatively straightforward. Here’s what to consider before you begin.

How to calculate how much paint you need

The amount of paint required depends on the size of the area you’re decorating, the paint’s coverage rate and the number of coats needed.

Start by measuring the height and width of each wall you plan to paint. Multiply these measurements to calculate the area in square metres, then add the wall areas together.

You can subtract the areas of large windows and doors for a more accurate estimate.

Once you know the total area, you’ll need to account for the number of coats and the coverage rate of your chosen paint.

The simplest way to do this is with our paint calculator, which helps you estimate the quantity required for your project.

Calculate how much paint you need

How many coats of paint will I need?

Most decorating projects require more than one coat to achieve an even, consistent finish.

Our natural paints typically provide excellent coverage in two coats when applied to a suitably prepared surface, although the number required can vary depending on the colour, finish and condition of the substrate.

Always check the relevant technical data sheet before ordering.

What affects paint coverage?

Several factors can influence how far a tin of paint will go.

The condition of your walls: Porous or uneven surfaces may absorb more paint and require additional preparation.

The colour you’re painting over: A significant colour change can affect the number of coats needed to achieve the desired finish.

The paint finish: Different formulations can have different coverage rates, so it’s important to check the product guidance.

The application method: Brushes, rollers and other application methods can affect paint consumption.

Taking these factors into account will help you order a more appropriate quantity.

How much paint do I need for ceilings and woodwork?

Don’t forget to include ceilings, skirting boards, doors and other woodwork when planning your project.

Measure these surfaces separately and check which paint finish is suitable for each.

Ceilings can be calculated using the length and width of the room, while woodwork may require more detailed measurements depending on the number and size of the surfaces being painted.

If you’re using different finishes or colours, calculate the quantity needed for each separately.

How can I avoid ordering too much paint?

Accurate measurements are the best starting point.

Before ordering, make sure you’ve accounted for all the surfaces you intend to paint, the recommended number of coats and any preparation products required.

It’s also worth considering whether you’ll want to retain a small amount for future touch-ups.

Our paint calculator can help you estimate the quantity you need, reducing unnecessary waste and making it easier to plan your order.

Ready to start painting?

Once you’ve worked out your quantities, you can explore our natural paint range and choose the appropriate finishes for your project.

All our paints are mixed to order in Herefordshire, so we recommend ordering in good time, particularly if you’ve booked a decorator.

And if you’re still deciding on your colours, our Colour Consultants are here to help you create a scheme you’ll love.

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The Colour Supplement

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How much paint do I need?

We have created this calculator to help you estimate the amount of paint you will need for your project. Please note that this is only an estimate, based on normal surfaces with two coats of paint.

Please check our practical painting advice - if you are painting onto a very absorbent surface, you may need more paint, and for best results, you may need to prime your surfaces.

If you end up with any leftover paint, get inspired with ways to use any excess paint - it's even compostable!

What are you painting?

Estimated
Painted Wall/Ceiling Area

Our natural matt emulsion is perfect for interior walls and ceilings.

0 litres

0 m2

This estimate is based on two coats of paint and the dimensions of your room, minus the space taken by average doors and windows.

For this area, we suggest would be adequate.

Estimated
Woodwork Area

Our water based eggshell or gloss is ideal for woodwork or metalwork.

0 litres

0 m2

This estimate is based on two coats of paint and the skirting and the doors/windows you told us about. 1 litre should cover 2-3 doors or 20m of skirting.

For this area, we suggest would be adequate.

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