Wall Framing Calculator
How many studs a wall needs at 16 or 24 in centres, with door and window openings, kings, jacks, cripples, corners, plates, headers and sheathing sheets.
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About this toolWhat is the Wall Framing Calculator?
The quick rule of one stud per foot of wall gets close for a plain partition, but a real framing takeoff has to count the studs on layout, take out the ones that land inside door and window openings, add king and jack studs and cripples around each opening, and add the extra studs that make corners and partition intersections. This calculator does that count and lists where each stud goes.
Enter the wall length and height in feet and inches (or metres), the stud spacing, the stud thickness, and the number of corners and wall intersections with the extra studs each one takes in your framing style. Add doors and windows by rough opening, choose the header depth from your header table and the number of plies and jacks.
The result gives the stud count with a waste allowance, the stud cut length (92-5/8 in for a standard 8 ft wall), the plates in linear feet and stock pieces, each header length, and the number of sheathing sheets.
- Feet-inch-fraction or metric input with live echo of the parsed value
- Layout studs, opening deductions, kings, jacks and cripples
- Corner and intersection studs set to your framing style
- Plate linear feet and stock pieces, header lengths, sheathing sheets
- Itemised stud table, copy and share link
How to use the Wall Framing Calculator
- Pick imperial or metric and enter the wall length and the height to the top of the plates.
- Choose the stud spacing, the stud thickness, and single or double top plate.
- Enter the number of corners and wall intersections and the extra studs each one uses in your framing style.
- Enter doors and windows by rough opening width and height, the window sill height, header depth, plies and jack studs per side.
- Read the studs to buy, stud length, plates, headers and sheathing, and check the table showing where the studs go.
Worked examples
16 ft exterior wall with a door and a window
Input
16 ft long, 97-1/8 in high, 16 in o.c., 2 corners and 1 intersection at 2 studs each, 38 x 82-1/2 door, 36 x 46 window at 36-1/2 sill, 2-ply 2x10 headers, 10% waste
Output
28 studs at 92-5/8", 48 lf of plate (3 pieces of 16 ft), headers 2 @ 41" and 2 @ 39", 5 sheets of 4x8
13 layout studs lose 4 to the openings, then gain 4 kings, 4 jacks, 2 sill cripples and 6 studs at the corners and intersection: 25 net, 28 with waste.
Plain 24 ft partition at 24 in versus 16 in
Input
24 ft wall, 97-1/8 in, no openings, no corners
Output
13 studs at 24 in o.c. against 19 studs at 16 in o.c.; 72 lf of plate either way
Wider spacing saves six studs here, but check that the wall height, load and sheathing allow 24 in centres.
Metric wall at 600 mm
Input
6 m x 2.4 m, 45 mm framing, 600 mm centres, 900 mm door and 1200 x 1200 mm window, 190 mm headers, 2 corners
Output
25 studs at 2,265 mm, 18 m of plate, headers 990 mm and 1,290 mm
Three 45 mm plates leave 2,265 mm for the stud. Each header is the opening plus a 45 mm jack on each side.
Background and insight
Studs are laid out from one end of the wall at a fixed spacing, so a wall of length L holds ceil(L / s) + 1 studs including the one at the far end: ten studs for a 12 ft wall at 16 in. Sixteen-inch layout lines up with 4 ft sheets every third stud; 24 in layout, used in advanced framing, lines up every second stud and saves roughly a third of the studs. Metric frames use 400 or 600 mm for the same reason with 1200 mm sheets.
A standard 8 ft wall is 97-1/8 in from floor to the top of the double top plate: three plates at 1-1/2 in plus a 92-5/8 in precut stud. That leaves room for a 96 in sheet of drywall on the wall plus the thickness of the ceiling board. Each opening gets a king stud on both sides running full height and one or more jack (trimmer) studs carrying the header; short cripples fill the layout above the header and below a window sill. Header size depends on the opening width and the load above and comes from a header span table such as IRC Table R602.7(1).
Common use cases
Ordering lumber for a room addition
Total studs, plates and headers wall by wall before calling the yard.
Basement and garage partitions
Count studs for non-bearing walls with a single top plate or 24 in spacing.
Bidding framing labour
Use the stud and opening counts as the basis for a per-piece or per-opening price.
Learning wall anatomy
See how kings, jacks, cripples and corner studs add up and where the extra studs go.
Tips and limitations
- Add studs for blocking, backing for cabinets and grab bars, and nailers for drywall at ceilings. They are not in the count.
- Bottom plates are cut out at doors after the wall stands, but you still buy the full length.
- A cripple above a header is only needed when the header leaves a gap under the top plate; deep headers often fill it.
- California corners and ladder blocking save studs and leave room for insulation; set the extra studs per corner to suit.
- Shear walls, hold-downs and point loads under beams add studs that only the plans can tell you about.
Frequently asked questions
How many studs do I need for a wall?
Divide the wall length in inches by the spacing, round up and add one. A 12 ft wall at 16 in centres needs 144 / 16 + 1 = 10 studs. Then add two kings and two jacks per opening, extra studs for corners and intersections, and about 10% for culls.
How long is a stud for an 8 foot wall?
92-5/8 in. With a single bottom plate and a double top plate (3 x 1-1/2 in) the wall is 97-1/8 in tall, which fits an 8 ft drywall sheet plus the ceiling board. Precut studs of 104-5/8 and 116-5/8 in do the same for 9 and 10 ft walls.
What are king, jack and cripple studs?
A king stud runs full height beside an opening. The jack, or trimmer, is nailed to it and carries the end of the header. Cripples are short studs that continue the layout above the header and below a window sill.
How many extra studs does a corner need?
A traditional three-stud corner adds two studs to the layout; a two-stud corner with drywall clips or a ladder adds one. A partition intersection usually adds two studs for a channel, or none if you use ladder blocking.
How long should a header be?
The rough opening width plus the jack studs on both sides. A 36 in opening with one 1-1/2 in jack each side needs a 39 in header. Header depth comes from the span table for the load it carries.
Is 24 inch stud spacing allowed?
Often, for walls that carry a single floor or roof within the limits of IRC Table R602.3(5) and with sheathing rated for 24 in spans. Check the table for your stud size, height and load before switching from 16 in.
Is there an in-depth guide to the Wall Framing Calculator?
Yes. “How Many Studs Do I Need? Wall Framing Takeoffs Explained” covers the background, how it works, common pitfalls and worked examples. Read the full guide.
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