How the math works
Wall length in inches: 20 × 12 = 240"Spaces: 240 ÷ 16 = 15.00 → 15 full spacesLayout studs = spaces + 1 = 16+2 corner/end backers, +10% waste: (16 + 2) × 1.10 = 20Plates: 1 bottom + 2 top = 3 × 20' = 60 LF
Each door or window adds king, jack and cripple studs — roughly +3 studs per opening.
Trade pro tips
- Pull layout from the same end on walls, floors and roof so sheathing seams land on framing.
- Crown every stud the same direction.
- Add 1 stud per foot of wall as a quick sanity check on bigger takeoffs.
Frequently asked questions
How many studs do I need for a 20 ft wall?
At 16" on center: 16 on layout; buy 20 to cover corners/ends and 10% waste. Openings add about 3 studs each.
How many studs for a 20 ft wall at 24 inches on center?
11 on layout, 15 to buy with corners and waste.
How much plate lumber for a 20 ft wall?
60 linear feet for a bottom plate and double top plate — 4 sixteen-foot boards (stagger top-plate joints at least 24").
What length studs for an 8 ft wall?
92-5/8" precut studs: with a bottom plate and double top plate (4-1/2") the wall is 97-1/8", leaving room for 1/2" drywall on an 8' ceiling.