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Area is length × width; perimeter is 2 × (length + width). Both use the units you enter, so metres in give square metres and metres of edge out.
L-shaped, sloped, or curved outlines are not handled directly — split them into rectangles, run each, and add the areas. For pitched roofs, use the true slope length rather than the flat plan length.
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.
