Square feet and linear feet calculator

A linear foot measures length; a square foot measures area. A width is required to convert between them. Enter the actual coverage width, which can differ from nominal board width when joints or overlaps are involved.

Linear feet = area(ft²) × 12 / width(in)
Square feet = length(ft) × width(in) / 12

120 square feet with a 6-inch coverage width requires 240 linear feet. A 100-foot length at the same width covers 50 square feet.

The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.

Known measurement

Square feet

Area

120 ft²

Actual coverage width

6 in

Primary result: Linear feet: 240 ft.

• Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
• Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
• When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.

This is continuous area coverage without cutting waste, end joints, pattern matching or purchase-length rounding. A board foot is a volume unit and also needs thickness; it is not interchangeable with a square foot.