Stud Calculator

Estimate full-height wall studs from wall length and on-center spacing, then add your own allowance for corners, intersections, doors, windows or other framing details.

Unit system

Length of one straight wall (ft)

Full stud length / wall height (ft)

Stud spacing on center (in)

Use the spacing specified by your design; the calculator does not select it.

Additional full-height studs

Enter a project-specific quantity for openings, corners, intersections or reinforcement.

Extra material / allowance (%)

Studs per bundle or pack

Price per stud (your currency)

Scope: one straight wall run with a stud at each end. Calculate separate walls individually because every run needs its own endpoints. This estimator does not size members or determine framing, structural, fire, wind, seismic or local code requirements.

Stud calculator formula

For one straight wall, convert wall length and spacing to the same unit. The layout count is:

Layout studs = ceil(wall length ÷ spacing) + 1

The extra 1 includes the far end stud. When the wall length is not an exact multiple of the spacing, the last bay is shorter. Then:

Base studs = layout studs + additional studs
Order quantity = ceil(base studs × (1 + allowance ÷ 100))

Worked examples

Wall and spacing	Additional / allowance	Result
12 ft at 16 in on center	0 / 0%	10 studs
10 ft at 16 in on center	0 / 0%	9 studs
20 ft at 24 in on center	0 / 0%	11 studs
30 ft at 16 in on center	6 / 10%	24 layout, 30 base, 33 to order
4.8 m at 400 mm on center	0 / 0%	13 studs
5 m at 600 mm on center	4 / 5%	10 layout, 14 base, 15 to order

How to use the estimate

Measure a single straight wall run and choose the matching unit system.
Enter the on-center spacing from the project design rather than treating the default as a recommendation.
Add the full-height studs required by the actual corner, intersection, opening and reinforcement details.
Adjust the allowance, bundle quantity and price. The result rounds orders and packs upward.
Repeat for each separate wall, then add the order quantities.

Important limitations

The result counts full-height vertical studs; it excludes plates, headers, sills, cripples, blocking, bracing, sheathing and fasteners.
The additional-stud field is deliberately editable because opening and corner assemblies vary by design, materials and jurisdiction.
Bundle count is purchasing math only. Suppliers may sell different pack quantities or individual pieces.
Total linear length assumes every ordered stud has the entered full length and does not optimize offcuts.
Price excludes tax, delivery, treatment, waste disposal and labor.
Structural and code decisions require project documents and qualified local review.

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Frequently asked questions

Why does the formula add one stud?

The spacing divisions describe bays. Adding one includes the stud at the far end of the wall.

Can I calculate an entire room at once?

Calculate each straight wall separately and add the results. Treating a room perimeter as one run would miss endpoint studs at wall breaks.

Does it subtract doors and windows?

No. Openings change the framing arrangement rather than simply removing wall length. Enter the project-specific net change as additional full-height studs, and estimate headers, sills and cripples separately.

Can it calculate metal studs?

The spacing count can describe a straight metal-stud wall, but member selection, tracks, openings, bracing and connection details are outside this calculator.

Is the default spacing a code requirement?

No. It is an editable example only. Use the spacing in the project documents or applicable local requirements.

How is the bundle count calculated?

The order quantity is divided by the entered pack quantity and rounded upward. Cost still uses the per-stud price and ordered stud count.

After laying out the framing: use the Insulation Calculator to estimate batts, boards, rolls or loose-fill packages for the framed surface.