Wall Stud Count Calculator

For a standard stud wall, the field stud count is: floor(wall length in inches / spacing) + 1. Most walls use 16-inch on-center (OC) spacing; non-load-bearing interior walls sometimes use 24-inch OC, which cuts material costs by about 25%.

But the basic count is never the whole order. Real walls need extras:

Each door or window opening takes 4 additional studs: two king studs (full height) and two jack studs (trimmer studs cut to the header height). Add cripple studs above each opening to fill the gap between header and top plate.

Each L-corner or T-intersection where an interior wall meets an exterior wall needs 3 extra studs to create a nailing surface on both sides.

Top and bottom plates are not studs but come from the same lumber. You need 3 plates per wall: two top plates (one structural, one tie plate) and one bottom plate. That is 3 × wall length in linear feet of the same 2x4 or 2x6 material.

This calculator counts studs only; add plate material separately.

Precut studs come in standard lengths: 92-5/8 inches for an 8-ft ceiling with a 3-plate configuration, and 104-5/8 for 9-ft ceilings. If you are cutting studs from longer lumber (8-ft or 10-ft sticks), plan your cuts to minimize waste.

Stud spacing also affects sheathing. For both 16-inch and 24-inch OC, standard 4×8 OSB or plywood sheathing panels land cleanly on studs. Non-standard spacing creates an alignment problem that costs time during sheathing.

Quick reference: field studs by wall length

These are field studs only, before corner extras and opening additions. Studs at the lumber yard typically come bundled in 20-25 sticks; round your order up to a full bundle for the small price difference and the buffer it gives for damaged pieces and miscuts.