Interior Finish Calculators

Working with interior quantities

Interior finishes are dominated by coverage rates, and published coverage rates are optimistic. A gallon of paint claims 400 square feet; on a real repaint it does about 350, and on new or textured drywall considerably less. The figures used here are the working numbers, not the tin numbers.

Worth knowing: Order the whole job from one batch. Paint dye lots and tile production runs both vary visibly, and a repair two years later will never match.

These 11 calculators cover about 60,830 searches a month between them. Every one prints the formula it uses and a worked example, so you can check the result by hand before you order.