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Square Footage Calculator: Easily Measure Room Area for Any Shape

Unlock the power of precise space measurement with our comprehensive Square Footage Calculator Guide infographic.

This calculator multiplies your room’s length × width—or uses π r² for circles—to return square feet and square metres in seconds. Enter feet and inches; the script converts inches to decimal feet, preventing manual errors. A 22 ft 3 in circular sunroom equals roughly 389 sq ft, or 36 sq m. Average U.S. living rooms measure 330 sq ft (National Association of Home Builders, 2022).

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