How many studs do I need per foot of wall?

At 16 inches on-center, plan about 1 stud per foot of wall once corners, openings and culls are counted in. A 40 ft wall typically consumes 40 or more studs.

Is 16 or 24 inch stud spacing better?

Most load-bearing and exterior walls use 16 in on-center. 24 in spacing is acceptable for many non-bearing partitions and advanced framing, but check drywall thickness and local code.

Framing

Wall Framing Calculator

Estimate studs, plates, headers and sheathing for framed walls.

100% free to useNo sign-up requiredImperial & metric units

How many studs do I need?

To find how many studs you need, divide the wall length in inches by the stud spacing and add one, then add about 2 studs per corner and 3 per door or window opening. A 24 ft wall at 16 inches on-center takes 19 field studs, plus corners, openings and a cull allowance — plan roughly one stud per foot of wall.

Inputs

Total wall lengthft

Wall heightft

Stud spacing

16 in on-center is standard for load-bearing walls.

Corners / T-intersectionscount

Doors & windowscount

Sheathing

Waste allowanceApplied to material quantities

Results

Studs

Includes corners & openings

Plate Stock

5 16 ft boards

Bottom + double top plate

Plate Length

72 ft

Wall Area

192 sq ft

Headers

Size per span & load

Sheathing

6 4×8 sheets

Estimates update instantly as you type. Confirm against local code before ordering materials.

A framing takeoff that only counts field studs comes up short on every wall, because corners, T-intersections, and openings each consume extra lumber that plan-view math never shows. This free wall framing calculator counts the studs at your chosen spacing, then adds the corner assemblies and the kings, jacks, and cripples around doors and windows, plus plate stock and sheathing.

Spacing drives the count more than anything else. Sixteen inches on-center is the standard for load-bearing and exterior walls, while 24 inches works for many partitions and advanced framing designs. Add a cull allowance on top — every lift of studs includes a few crowned or split boards that will not make it into a straight wall.

How wall framing is calculated

Stud count is the wall length divided by the on-center spacing, plus one to close the run, plus extras for corners, T-intersections and openings. Plates add three runs of the wall length (one bottom, two top), and sheathing divides the wall area by panel coverage.

Studs = (Wall Length ÷ Spacing) + 1 + corners + openings

Field studs by wall length

Studs in the run at common spacings, before corners and openings.

Wall length	16 in OC	24 in OC
8 ft	7 studs	5 studs
16 ft	13 studs	9 studs
24 ft	19 studs	13 studs
40 ft	31 studs	21 studs

Add roughly 2 studs per corner or T-intersection and 3 per opening for kings, jacks and cripples.

How to use it

1Enter the total wall length in feet and the wall height.
2Choose the stud spacing — 16 in on-center is standard for load-bearing walls.
3Add the number of corners and openings (doors and windows).
4Read the stud, plate, header and sheathing counts instantly.

Key terms explained

On-center (OC): The spacing between stud centers, typically 16 or 24 inches. Drywall and sheathing sizes are designed around these modules.
King and jack studs: The full-height stud (king) and the shortened stud (jack) that frame each side of an opening and carry the header.
Cripple stud: A short stud above a header or below a sill that maintains the stud layout through an opening.
Double top plate: Two overlapping top plates that tie walls together and distribute loads. Standard on load-bearing walls.

Worked examples

Garage wall

A 24 ft wall at 16 in on-center needs 19 studs in the run, plus about 2 studs per corner and 3 per opening for kings, jacks and cripples.

Basement partition

A 30 ft partition at 8 ft tall takes roughly 24 studs, 90 linear feet of plate stock and 8 sheets of sheathing if covered one side.

Pro tips from the field

1Cull studs on delivery, sight down each one and set aside crowned or twisted boards for blocking.
2Lay out plates for both walls of a corner at the same time so intersections land on layout.
3Precut studs (92-5/8 in) build a standard 8 ft wall with plates; do not order 96 in stock for that.
4Size headers per span and load from code tables; the count here is placeholders, not sizes.

Common mistakes

Counting only field studs and forgetting kings, jacks and cripples at openings.
Using a single top plate on load-bearing walls where two are required.
Ordering exact counts — crowned, bowed and split studs get culled on every lift.

Where it gets used

Garages and additions

Take off framing lumber for new exterior walls in one order.

Basement finishing

Count studs and plates for partition layouts before the lumber run.

Bid checks

Sanity-check a framing bid’s lumber count against wall lengths and openings.

Frequently asked questions

Free Wall Framing Calculator for Studs & Plates

Framing lumber gets ordered by count, and shortages stop the whole crew. This free wall framing calculator converts wall length, height and spacing into studs, plate stock, header material and sheathing panels — including the corner and opening framing that plan-view math always misses.

Use 16 inch on-center spacing for structural walls, add your corners and openings, and carry a cull allowance so a few crowned studs do not send anyone back to the yard mid-lift.