Stud Wall Material Calculator
Estimate the studs, top and bottom plates and drywall sheets for a framed wall from its length, height and stud spacing.
How it works
field studs = ceil(length×12 ÷ spacing) + 1 · plate lumber = 3 × length (single bottom + double top) · drywall sheets = ceil(area ÷ 32) × sides
On-center spacing sets the stud count: divide the wall length in inches by 16 (or 24) and add one for the end stud, then add roughly 15% for corners, T-walls and the king and jack studs that frame every opening. Plates run the full length three times — a single bottom plate and a doubled top plate — and drywall is figured at 32 sq ft per 4×8 sheet on each finished side.
Worked example
A 20 ft × 8 ft wall at 16 in on-center: ceil(240 ÷ 16) + 1 = 16 field studs, ×1.15 ≈ 19 studs. Plates: 3 × 20 = 60 linear ft. Drywall both sides: 160 sq ft ÷ 32 = 5 sheets per side, so 10 sheets.
Frequently asked questions
Why add 15% to the stud count?
The bare on-center count only covers the field. Every corner needs two or three studs, every T-intersection a backer, and every door and window a king plus a jack stud on each side. Fifteen percent is a safe blanket allowance for a typical wall; a wall full of openings can need more.
Why is the top plate doubled?
A doubled top plate ties intersecting walls together and lets you overlap joints at corners so the wall acts as one continuous member. That is why plate lumber is figured at three times the wall length — one bottom plate and two top plates.
How many drywall sheets per wall?
Divide the wall area by 32 sq ft (a 4×8 sheet) and round up, then multiply by the number of finished sides. Interior partitions are finished both sides; a garage-to-house wall is often one side plus fire-rated board.
Related calculators
Estimates only — add for waste and confirm every load-bearing decision against local building codes and a design professional.