Paint & Coatings calculators

Buying paint by guesswork leaves half-used tins in the shed or sends you back to the shop for a batch that does not quite match. These calculators work from real coverage rates and the number of coats each surface needs, so the litres you buy suit the room. They cover interior paint, plasterboard, plaster and exterior render, with waste already allowed for, whether you are repainting one wall or the whole house.