Interior calculators

Measure the room once and work out drywall, paint and tile from the same numbers.

Drywall calculatorSheets for walls and ceilings, minus doors and windows.Paint calculatorGallons or litres by coats and the coverage on your can.Tile calculatorTiles and boxes for floors and walls, with grout joints.

Measure once

All three calculators start from the room's length, width and wall height. Measure at floor level, round up to the next inch, and note the size of each door and window.