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Wall Framing Calculator

Calculate studs, plates, board feet, and lumber cost for framing walls with doors and windows.

Total Studs (with 15% extra)

42 studs

60 LF plate lumber

Field studs (16" OC)16
Door framing (1 door)+6 studs
Window framing (1 win)+11 studs
Corner (standard)+3 studs
Total studs (net)36
Order quantity (15% extra)42
Plates (double top + bottom)60 LF
Total board feet232 BF
Estimated cost$312.00
info

Mike Callahan:“Always order 15% extra studs. Between bows, splits, and the ones you cut wrong, you’ll use them. Nothing worse than sending a guy to the yard for 6 studs at 3pm.”

Methodology

Field studs = ceil(wall length in inches / spacing) + 1. Each door adds 2 king studs, 2 jack studs, and 2 cripples (doubled header counted as 2 studs). Each window adds 2 king, 2 jack, 2 header pieces, 1 sill, and 4 cripples. Standard corner uses 3 studs; California corner uses 2 studs plus flat blocking. Plates = wall length x 3 (double top plate + single sole plate). Board feet calculated at 0.667 BF/LF for 2x4 lumber. Stud price at $6.50 per 2x4x8; plate lumber at $0.65/LF. 2026 pricing — adjust for local market.

Frequently Asked Questions

16 vs 24 inch OC spacing — which should I use?
16 inches on center is standard for load-bearing walls and any wall with drywall on both sides. It provides better drywall backing and stronger walls. 24 inches on center is acceptable for non-load-bearing interior partitions and is common in advanced framing (OVE) techniques to reduce lumber use. Some codes allow 24" OC for exterior walls with 2x6 studs. Always check your local building code and structural plans.
How many studs for a 20-foot wall?
At 16" OC: ceil(20 x 12 / 16) + 1 = 16 field studs. Add studs for doors, windows, and corners. A typical 20-foot wall with 1 door and 1 window needs about 16 + 6 (door) + 11 (window) + 3 (corner) = 36 studs before the 15% waste factor. With waste, order 42 studs. At 24" OC the field stud count drops to 11, saving about 5 studs.
What is a California corner?
A California corner (also called a “two-stud corner”) uses two studs instead of three at an inside wall intersection, with flat 2x4 or 2x6 blocking to provide a drywall nailing surface. It saves one stud per corner and — more importantly — leaves room for insulation in the corner cavity. Standard three-stud corners create a dead air pocket that is difficult to insulate. California corners are preferred in energy-efficient framing.
King stud vs jack stud — what is the difference?
A king stud runs full height from sole plate to top plate, framing each side of a rough opening. A jack stud (also called a trimmer) is shorter — it sits on the sole plate and supports the header above the opening. The king stud transfers loads from the top plate, while the jack stud transfers the header load down to the sole plate. Every door and window opening needs at least one king and one jack stud on each side.