Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Calculate how many wall studs you need from wall length, spacing, corners, and openings.
24
This calculator solves the specific stud-count question for a wall: how many vertical studs does an on-center spacing require, plus the extra studs every corner and every door or window opening needs beyond the basic spacing formula.
Enter your wall's length and the on-center spacing (16in is the most common US residential standard, 24in is used in some energy-efficient framing). Add how many corners and openings the wall has.
Base Studs = FLOOR((Wall Length in ft × 12) ÷ On-Center Spacing) + 1
Extra for Corners = Corners × 2
Extra for Openings = Openings × 4 (king + jack stud on each side)
Use this for a quick stud count on a single wall. For a fuller takeoff that also includes top/bottom plates, see the Wall Framing Calculator.
Studs are placed at regular intervals along the wall, starting at one end. If a wall is 16 feet long with 16-inch spacing, there are 12 spaces of 16 inches, and the studs bracket them. That is why the formula adds one to the floor of the length divided by spacing: you need a stud at the start plus one for each interval. The floor function means the calculator counts the studs that fit on the regular layout; a final stud may then be needed to close the wall out at its end.
Take a hypothetical 14-foot wall at 16-inch spacing with 1 corner and 2 openings. Length in inches is 168. FLOOR(168 / 16) = 10, plus 1 equals 11 base studs. Corners add 1 x 2 = 2, and openings add 2 x 4 = 8. The total is 11 + 2 + 8 = 21 studs. If you add a couple of spare studs for warped pieces, you would buy about 23.
Total = FLOOR(Length in ÷ Spacing) + 1 + (Corners × 2) + (Openings × 4)
Moving from 16 inch to 24 inch spacing reduces the number of studs noticeably, which saves lumber and can leave more room for insulation. However, 24 inch spacing may not be permitted or appropriate for every wall, depending on the load, the finish material, and local building code. Drywall thickness and load-bearing requirements can determine which spacing is acceptable, so check your plans.
This is a quick count for planning and pricing. Structural framing has requirements for headers, bracing, and fire blocking that come from your plans and local code, not from this tool.
Each side of a door or window opening typically needs a full-height "king" stud plus a shorter "jack" (trimmer) stud supporting the header -- 2 studs per side x 2 sides = 4 extra studs per opening.
Corners need extra framing (commonly 2-3 studs) to provide a nailing surface for the intersecting wall's drywall and to tie the two walls together structurally.
Run the calculator for each wall, or add the walls together and account for shared corners. Add the results for a total.
Most builders do. A few extra let you skip warped pieces and cover mistakes.
No. Plates are handled in the Wall Framing Calculator.
Not always. It depends on the wall type, load, and local code, so check your plan.