Buy right

We estimate that 30% of people have leftover paint because they bought too much. One easy way you can help reduce the amount of leftover paint, is to prevent over-purchase by buying the right amount. Although calculating this is not an exact science, many paint companies provide their own guidance for how much paint is required. If you know which paint you’re using, click on the links below to access individual paint company calculators/guidance.

Web resources:

B & Q

Craig & Rose


Farrow & Ball (Links to information chart. Online calculator is found on each paint product page)


Leyland Trade



Sherwin Williams


Smart phone apps:

Crown Paints: Android, iPhone

Do you have a paint calculator you’d like to add to this list? Contact amy.white[at]

 Video library

Our buy right campaign aims to help consumers figure out how much paint they need before they buy. View the short videos below for some advice on how to buy right.