Wall Stud Calculator

This calculator counts the framing in a stud wall. Enter the wall length and height, the stud spacing and what is cut into it, and it returns the common studs on the layout, the studs taken out for each opening, the two king studs and two jacks that replace them, the cripples over the header and under a window sill, and the extra studs at corners and partition intersections. It also gives the stud length once the three plates are taken off, the linear feet of plate lumber for a single bottom and double top plate, and the header length for each opening. A second mode marks out the bottom plate, showing why the first mark is short of the spacing and where the last, shorter bay falls.

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Measurements In
The stud spacing is chosen separately, because 400 mm centres and 16 in centres are two different modules rather than one converted into the other. A blank box falls back to that market's own stock size: a 2.4 m wall, a 900 mm door opening, 4.8 m plate stock.

Give the wall, the spacing and what is cut into it. Openings take out the layout studs that fall inside them and add kings, jacks and cripples.

Floor deck to the top of the double top plate. Left blank it is 8 ft, or 2.4 m.
16 in is the usual for a load bearing wall, 24 in for a non-bearing partition where the code and the sheathing allow it. Outside North America the same two roles are 400 and 600 mm, which are not the same centres: 16 in is 406.4 mm.
The rough opening, not the door leaf. A 32 in door is usually a 34 in rough opening. Left blank it is 36 in, or 900 mm.
Left blank it is 48 in, or 1,200 mm.
Where this wall meets another at a corner and needs backing for the board.
Where another wall lands in the middle of this one. Each takes two backer studs.
Left blank it is 16 ft, or 4.8 m.
Leave at zero to skip the cost line.
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Measurements In
The spacing is chosen separately: 400 and 600 mm are their own module, not a conversion of 16 and 24 in.

Where the marks go along the bottom plate, and why the first one is short of the spacing.

16 in is the usual for a load bearing wall, 24 in for a non-bearing partition where the code and the sheathing allow it. Outside North America the same two roles are 400 and 600 mm, which are not the same centres: 16 in is 406.4 mm.
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