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Room Area Calculator
Create a dependable measurement baseline before estimating paint, flooring, drywall, trim, or wall coverings.
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How to calculate it
- Measure finished interior length and width.
- Measure floor-to-ceiling height.
- Combine major door and window openings for net wall area.
Frequently asked questions
How do I handle an L-shaped room?+
Split the room into two rectangles, calculate each one, and add the floor and ceiling areas.
Are floor and ceiling areas always equal?+
They are equal for a flat ceiling over a rectangular room. Sloped, vaulted, or stepped ceilings need separate measurements.