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Square Footage Calculator

Measure common shapes, subtract openings, and compare areas in square feet and square metres.

Your measurements

Choose a unit beside each measurement. Switching units preserves your dimensions.

Your estimate

Enter measurements and select Calculate.

How this estimate works

Area is calculated from the selected shape, less the entered deduction, then multiplied by quantity. Border dimensions are the outside dimensions. Divide complex sites into simple, non-overlapping areas.

Values are rounded only for display. Calculations stay on this device. No signup required.

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