Updated
Paint & Finishes
Paint Calculator
Estimate paint for walls, ceilings, trim, doors, windows and primer with this paint calculator, including coats, coverage, sprayer versus roller efficiency and project cost in imperial or metric units.
Wall, Ceiling, Trim & Primer Paint Estimator
Main field = feet or metres, extra field = inches or centimetres.
Use typical coverage from your paint or primer data sheet.
Applied to selected surfaces unless the mode states otherwise.
Extra to allow for touch-ups, colour matching, roller loading and tray loss.
Use 4 to approximate all walls in a simple rectangular room.
Use this to subtract doors, windows or other unpainted sections.