About InteriorCalcs

The hardest part of a tiling or painting weekend is often the shopping list. Tile and wallpaper come in production lots that rarely match the next batch, paint is mixed to order, and drywall is awkward to return. Getting the quantity right on the first trip saves money and a lot of driving.

What you will find here

InteriorCalcs covers the inside of the house: floor and wall tile, backsplashes, paint, drywall, flooring, wallpaper and trim. Each calculator answers one job and turns your measurements into the unit you actually buy: tiles and boxes, gallons, sheets, rolls or linear feet.

How the pages are written

Every result is shown together with the arithmetic behind it, the extra it adds for cuts and spares, and the coverage it assumes per box, gallon or sheet. When a product label says something different, the label wins, and the calculator lets you type in the figure from the carton.

Independence

We are not a store and do not get paid per tile sold. Brand names appear only where a coverage figure or a size standard comes from that maker's published data.

Formulas and checks: methodology · Questions or a wrong number: contact.