Key Takeaways
- Stud count is wall length in inches divided by spacing, rounded up, plus one
- Shorter on-center spacing means more studs for the same wall length
- Corners commonly add two extra studs each, on top of the base layout
- This counts layout studs only, not the extra studs a rough opening needs
Stud count is the number people usually want first when pricing out a wall, and it comes from just two things: how long the wall is and how far apart the studs are spaced. Everything else, corners, openings, plates, is added on top of that base number.
Base layout from length and spacing
Studs are laid out at a fixed on-center spacing, most commonly 16 or 24 inches, measured from the center of one stud to the center of the next. The calculation converts wall length to inches, divides by the spacing, rounds up, and adds one for the starting stud at the beginning of the run. A 20 foot wall at 16 inch on-center spacing works out to 240 inches divided by 16, which is 15, plus one, for 16 studs. Tightening the spacing to 12 inches raises that count; loosening it to 24 inches lowers it, since a shorter spacing packs more studs into the same length.
Why corners need extra studs
Where two walls meet, the layout stud from the base count alone does not give the inside corner anything to nail drywall to. Framers commonly add extra studs there, most often building what is called a three-stud corner. This adds two studs per corner on top of the base layout, a common but not universal practice: some builders use a two-stud corner with drywall clips instead, so it is worth checking what the framing plan and local code call for before finalizing a count.
What is left out
This count covers only the base on-center layout plus corners. It does not include the extra jack and king studs a rough opening for a door or window needs, and it does not include plate lengths. For a wall with openings and plates included in one estimate, a fuller material list is what the framing calculator is for.
Use the stud calculator to work out stud count for your own wall length, spacing and corner count.