What is standard stud spacing?
Wood wall studs are standard at 16 or 24 inches on-center (o.c.). 16 in o.c. is the common default; 24 in o.c. is allowed for many walls but typically calls for 5/8-inch gypsum board to keep the drywall from sagging. The allowable spacing depends on stud size, height, and load — set by the IRC (§R602.3).
Source: IRC §R602.3 · Verify against your AHJ and the adopted code edition.
On-center (o.c.) spacing is measured from the center of one stud to the center of the next. Two spacings cover almost all wood framing:
- 16 inches o.c. — the common default. It lines up cleanly with 4- and 8-foot sheet goods and carries typical loads with standard studs.
- 24 inches o.c. — uses less lumber and is permitted for many walls, but it usually needs 5/8-inch gypsum board (rather than 1/2-inch) so the drywall doesn’t sag between studs.
Whether a given spacing is allowed depends on the stud size, wall height, and load — the IRC sets this in the tables under §R602.3 (we cite the section and link out rather than reproduce the tables).
Two reminders when you count studs: this is field studs only, so add studs for corners, wall intersections, and rough openings — and check your local amendments.
Work it out: the stud-spacing reference takes a wall length and a spacing and returns the field-stud count and the bay layout.
Sources
- ICC — International Codes (IRC) — IRC §R602.3