Count studs and lay out a straight wall from one reference end. Results give stud centres, clear bay widths, noggin quantities and a plate-stock length estimate. Enter the actual stud cut length, excluding plates.
The first end stud has its centre at half its thickness. Regular interior centres are at one spacing, two spacings and so on from the wall end. A near-face marking line is half a stud thickness before each centre. Do not subtract half a thickness from the centre itself.
With 400 mm spacing and 38 mm studs, the centres are 19, 400, 800, 1,200 … 5,600 and 5,981 mm: 16 studs. The first and last clear bays are 343 mm; the 13 middle clear bays are 362 mm. One row therefore has 15 noggins totalling 5,392 mm before cutting allowances. Three plate runs total 18,000 mm, or at least four 4,800 mm stock lengths by total length alone.
For a 144-inch run, 16-inch spacing and 1.5-inch actual stud thickness, the centres are 0.75, 16, 32, 48, 64, 80, 96, 112, 128 and 143.25 inches: 10 studs. This straight-run count excludes opening framing, corner assemblies, intersections and spares.
Enter the spacing specified for your wall and cladding. Metric 400/600 mm and imperial 16/24 inches are different dimensions, not exact conversions. Panel joints must be checked against the actual framing layout. Spacing suitability depends on the wall system, panel rating and applicable design requirements; this tool does not select it.
Stud cut length excludes the top and bottom plates. The plate-stock count divides total plate length by stock length and rounds up; it is a lower bound, not a cutting plan. Check joint locations, kerf, offcuts and waste before ordering. Noggins use clear bay widths, not centre spacing.
Doors, windows, corners and wall intersections need additional framing and their own details. If a regular centre causes overlap with the closing stud, the tool stops instead of returning an impossible layout. This calculator does not size headers or verify structural capacity.
For wall-system context, see APA’s advanced framing guidance and the specified panel installation instructions.
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