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Fileraz
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Fileraz
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Construction Calculator
Rule-of-thumb site math, reviewed October 2026 — first-pass material estimates, not a bill of quantities or a code check. Confirm with your contractor or engineer.
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Floor area is length × width; perimeter is 2 × (length + width) for skirting. Paint still needs wall height and openings, which this page does not subtract. L-shaped rooms: split into rectangles and add. For sheeting a pitched roof, use the roof-area calculator with slope length.
This is an indoor floor rectangle. Wall paint still needs height and openings, which are not fields here. Do not enter roof slope length — that belongs on the roof-area calculator. Mixing feet and metres in the two fields gives a nonsense area.
It does not subtract doors, estimate paint litres or tile counts, or accept roof slope lengths — it measures the indoor rectangle that finish estimates start from.
Indoor rectangles only — paint and tiles need their own pages.
No — only floor area and perimeter. Use the paint calculator with wall area, coats, and the tin's coverage.
Yes, as long as both sides use the same unit; the area then comes out in square feet. Do not mix feet and metres in the two fields.
Split it into two rectangles, run each, and add the areas — the same for skirting lengths. Curves are approximated, not exact.
No. Dimensions stay on your device.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.