Rebar Calculator
Rebar for a slab.
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Construction
Stud Calculator
Find how many studs a wall needs at any spacing.
Studs needed
—
Plus corners.
| Base studs | — |
|---|---|
| Plate lumber | — |
| Wall length | — |
| Spacing | — |
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Enter your figures above to see the step-by-step working.
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How the Stud Calculator Works
Wall studs are spaced evenly, usually 16 inches on center. The number of studs is the wall length in inches divided by the spacing, plus one for the end — then a couple extra for corners and blocking. A 20-foot wall at 16-inch spacing needs about 18 studs, plus three times the length in plate lumber for the top and bottom plates.
Add more studs at doors, windows and wall intersections for framing openings. This gives the baseline count for a straight wall.
studs = (wall length × 12 ÷ spacing) + 1, plus extras
Frequently Asked Questions
How many studs do I need for a 20 foot wall?
About 16 at 16-inch spacing plus a couple for corners — roughly 18 total, before openings.
What is standard stud spacing?
16 inches on center is most common; 24 inches is used in some construction, and 12 inches for extra strength.
How much plate lumber do I need?
About three times the wall length — one bottom plate and a double top plate.
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