Stud Calculator
Count studs for a wall at 12, 16 or 24 inch spacing, and see where each one lands.
What you need
10
Studs needed — One per spacing interval, plus one to finish the wall.
- Bays between studs
- 9
Estimates for planning. Confirm quantities with your supplier before ordering — see the assumptions below for the figures used.
Shop this project
The supplies a stud job usually takes. Quantities come straight from your calculation above — check them against your supplier's pack sizes before ordering.
Your shopping list
- Framing lumber
- 10 studs
Materials
Framing lumber
Prep & extras
Framing nails or screws
Tools & equipment
Nailer
Level
String line and marking paint
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How to use the stud calculator
A quick, focused stud count: how many studs a wall needs at your spacing, and the on-centre layout positions so you can mark the plate. If you need the full framing package — plates, headers, sheathing — use the framing calculator instead.
What this calculator assumes
Every estimate depends on figures that vary by supplier and conditions. These are the ones used here, so you can sanity-check the result against your own quote.
- The count is one stud per spacing interval plus one to close the end of the wall. It excludes corner backing, king and jack studs, cripples and headers — add those with the extras field, or use the framing calculator.
- Spacing is on centre, meaning centre of stud to centre of stud. Layout is normally marked from one end so sheathing edges land on a stud.
- 19.2 in on centre gives exactly 5 bays per 8 ft sheet and appears on tape measures as the black diamond marks.
- Stud spacing for load-bearing walls is governed by code and depends on stud size, height and load. This is a count, not a structural check.
Frequently asked questions
How many studs do I need for a 12 foot wall?
At 16 inch centres: 144 inches ÷ 16 = 9 bays, so 10 studs to close both ends. Add 2 per corner and about 6 per door or window on top of that.
What does 16 inches on centre mean?
The distance from the centre of one stud to the centre of the next is 16 inches — so the clear gap between them is 14½ inches for a 2x4. Measuring gap-to-gap instead of centre-to-centre is a common way to end up with sheathing edges floating in mid-air.
Why is 19.2 inches a standard spacing?
Because it divides a 96 inch sheet into exactly 5 bays, so panel edges still land on studs. It uses fewer studs than 16 inch centres while keeping the sheathing module. It is the black diamond marking on a tape measure.
How do I find studs in an existing wall?
Start at a corner or an outlet — outlets and switches are nailed to the side of a stud — then measure 16 inches to find the next. A magnet will locate the drywall screws, which is usually more reliable than a cheap electronic stud finder.
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