π¨ Wall Stud Calculator
Calculate studs needed for wall framing at 16" or 24" on center.
Total Studs Needed
How to Use This Calculator
Enter each wall length, the number of doors and windows in that wall, and choose your stud spacing. Click "Add Wall" for additional walls. The calculator adds field studs plus extra studs for rough openings and corners, then gives you a plate lumber estimate as well.
Enter the length of each wall in feet. For a room with four walls, add each wall separately for the most accurate count.
Count the doors and windows in each wall. Each door rough opening needs 4 extra studs (2 king studs and 2 trimmers). Windows also need 4 extra studs each.
Choose stud spacing. Use 16 inches on center for load-bearing walls and exterior walls. Non-load-bearing interior partitions can use 24 inches on center to save lumber.
The calculator includes plate lumber. Each wall needs a bottom plate and a doubled top plate, totaling 3 lengths of lumber per wall foot.
Stud Count Formula
A 12-foot wall at 16 inches on center needs 10 field studs plus corner extras. A 20-foot wall with one door and one window at 16 inches OC needs about 24 studs total when accounting for all the rough opening framing requirements.
Example Projects
Tips for Your Project
For 8-foot ceilings, buy pre-cut studs rather than cutting full 8-foot boards. Pre-cut studs are 92-5/8 inches long, which gives you the exact height needed when combined with the bottom plate and doubled top plate. They are usually cheaper per stud than full 8-foot boards and save significant cutting time on large projects.
Load-bearing walls run perpendicular to the floor joists in most residential construction. Never remove a stud from a load-bearing wall without adding a proper header and trimmer configuration. Non-load-bearing partition walls that run parallel to joists can use 24-inch spacing and single top plates, which reduces your lumber count by 20 to 30 percent on large partitioning projects.
Frequently Asked Questions
How many studs per linear foot of wall?
At 16" on center: ~0.75 studs/ft, or 1 stud per 1.33 ft. At 24" OC: ~0.5 studs/ft. Always add studs for corners, doorways, and window rough openings.
What is 16" on center vs 24" on center?
OC (on center) means stud spacing measured from center to center. 16" OC is stronger and required for load-bearing walls. 24" OC uses less lumber for non-load-bearing interior walls.
How many extra studs for corners?
Add 1β2 studs per inside corner, 1β2 per outside corner, 1 per wall intersection, and 2 per doorway (king studs + trimmers).
What length studs should I buy?
For 8 ft ceilings: buy pre-cut 92-5/8" studs. For 9 ft: 104-5/8". For custom heights, buy full 2Γ4Γ8 or 2Γ4Γ10 and cut.
How many 2Γ4s for a 12-foot wall?
At 16" OC: 12/1.333 = 9 field studs + 3 extras (corners/plates) β 12 studs total. Our calculator includes these extras automatically.