FREE PLANNING TOOLS
Floor area & volume calculator
Turn your measurements into square metres or cubic metres.
YOUR RESULT
A clearer starting point.
Complete the questions to see your result and the next step.
TRANSPARENT CALCULATIONS
Your measurements, simple geometry.
Rectangular area = length × width. Triangular area = length × width ÷ 2. Box volume = length × width × height. Triangular-prism roof volume = length × width × height ÷ 2.
A 5 m × 4 m rectangle is 20 m². A triangular-prism roof 5 m long, 4 m wide and 2 m high has a geometric volume of 20 m³.
These calculations do not establish net additional roof space, planning eligibility, usable headroom or structural capacity. Existing roof geometry and previous additions matter when assessing a loft proposal. Discuss your planning route.
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