Stud Spacing Calculator

Find how many wall studs you need for a given wall length and spacing.

Inputs

Wall Length (inches)

Stud Spacing (on center)

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Saved Scenarios

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Studs Needed

Spark says

How it's calculated

Formula

Studs = \lceil \dfrac{Wall\ Length}{Spacing} \rceil + 1

+1: — The extra stud needed to end the run

What is the Stud Spacing Calculator?

Wall studs are spaced 'on center' (measured from the center of one stud to the center of the next) — dividing wall length by spacing and adding one gives the basic stud count for a straight run.

How to use it

1 Enter the wall length in inches.
2 Choose your stud spacing (16" OC is standard for most residential framing).

Worked examples

240-inch (20 ft) wall, 16" OC

16 studs needed for the main run.

Try it

Limitations

•This is the basic run only — add extra studs for corners, T-intersections, door/window king and jack studs, and blocking, which aren't captured by a simple spacing formula.

Frequently asked questions

Why 16 inches on center?

16" OC aligns with standard 4×8 ft sheet goods (48÷16=3, 96÷16=6), so drywall and sheathing edges land exactly on a stud without extra cutting.