Framing by the numbers
Framing comes down to spacing: studs and joists are placed at 16 or 24 inches on-center, so the count is the length divided by the spacing plus one, with extras for corners, openings, and doubling. Sheet goods like plywood cover 32 sq ft each, and lumber is often sold and priced by the board foot. Because framing is structural, confirm member sizes and spans against your local code or an engineer.
Frequently asked questions
How do I count studs or joists?
Length ÷ spacing (16 or 24 in OC) + 1, plus extras for corners and openings. The calculators add plates and doubling.
What is a board foot?
Thickness (in) × width (in) × length (ft) ÷ 12. The board foot calculator totals an order and applies your price.