Wall Stud Count Calculator
Estimate how many vertical studs you need for a straight wall run before you head to the lumber yard. Enter the plate length in feet and the on-centre spacing required by your building code (typically 16 in. or 24 in.) to get a stud count that includes both end studs.
Always verify layout against structural drawings and local codes before purchasing materials.
Examples
- 18 ft wall at 16 in. OC ⇒ 14 studs • spacing every 1.33 ft.
- 12 ft wall at 24 in. OC ⇒ 7 studs • add extras for door or window openings.
- 28 ft garage wall at 16 in. OC ⇒ 22 studs • keep a 10% overage for blocking and waste.
- 9.5 ft partition wall at 24 in. OC ⇒ 6 studs • spacing every 2.00 ft.
FAQ
How do I allow for windows and doors?
Calculate the base stud count here, then add king studs, jack studs, headers, and cripples according to each opening width.
Does this calculator cover double top plates?
Double top plates affect linear footage of lumber, not the stud count. Plan additional studs separately if your design calls for ladder blocking or partition backers.
Can I work in metric spacing?
Yes—convert millimetres to inches (for example, 400 mm ≈ 15.75 in.) so the spacing aligns with North American sheathing modules.
Additional Information
- Stud count includes one stud at each end of the wall. Add king studs, jack studs, and cripples separately for doors and windows.
- Multiply the stud count by 1.5 in. to determine the total width of lumber occupying the plate and confirm sheathing panel layout.
- Plan for a contingency: order 5–10% extra studs for warped boards, blocking, fire stops, or layout adjustments.
- Confirm spacing with local building codes and engineered drawings—load-bearing walls may require 16 in. OC or closer.