Convert a run length in feet to linear feet (LF) for boards, trim or decking of a given width. 20 ft of wall covered with 6 in boards needs 20 LF of trim.
— LF
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| Run (ft) | Board width | Linear feet | Pieces (10 ft) |
|---|
What is a linear foot
A linear foot measures length only, ignoring width or thickness. To cover a known run, LF = run length × (board width ÷ row spacing), where row spacing = board width + gap.
Common mistake
Confusing linear feet with square feet. 20 LF of 6 in (0.5 ft) board covers 10 ft² of area — the two units are not interchangeable.
Linear metres calculator · Square feet to cubic feet · Board feet calculator
