Wall Framing Calculator
Studs and plates for framing a wall at 16 or 24 inches on center.
Each corner, door, or window adds about 2 studs.
You need
20 studs
Cull badly crowned or twisted studs at the store; buy 2 or 3 extra.
- Plate boards (16 ft)
- 4 boards
- Plate linear feet
- 60 linear ft
- Total 2x4 pieces
- 24 pieces
Estimates only. Verify quantities before ordering.
How this is calculated
Studs = wall length in inches / spacing, rounded up, plus 1, plus about 2 per corner or opening. Plate stock = 3 x wall length (one bottom plate, doubled top plate), divided into 16 ft boards.
Enter the wall length, pick the stud spacing, and this calculator counts the studs and the plate lumber. The base count is one stud per spacing interval plus one to close the end; corners, doorways, and windows each add roughly two more for king studs, jacks, and backing, which is what the openings field covers.
Standard interior and exterior walls in the US are framed with studs at 16 inches on center. 24 inch spacing is permitted for many non-bearing and single-story walls and saves lumber, but check your local code before using it on anything structural. Plates are the horizontal members: one bottom plate and a doubled top plate, which is why the calculator figures three times the wall length.
Framing for common wall lengths
Rows assume 16 in on center spacing with two corners or openings.
| Wall length | Studs | 16 ft plates |
|---|---|---|
| 8 ft wall | 11 studs | 2 boards |
| 12 ft wall | 14 studs | 3 boards |
| 16 ft wall | 17 studs | 3 boards |
| 20 ft wall | 20 studs | 4 boards |
| 40 ft wall | 39 studs | 8 boards |
Common questions
How many studs do I need per foot of wall?
At 16 inches on center, plan on three studs per 4 feet of wall (0.75 per foot) plus one end stud, before corners and openings. A 20 foot wall is 16 studs, and each corner, door, or window adds about two more.
Why is the top plate doubled?
The doubled top plate ties intersecting walls together and stiffens the wall between studs, and code requires the laps to be offset. A single top plate is allowed in some cases when joists land directly over studs, but doubling is the standard practice.
What stud length do I buy for 8 ft ceilings?
Precut studs at 92 5/8 inches are made exactly for this: with a bottom plate and doubled top plate they produce a wall about 97 1/8 inches tall, which accommodates 8 ft drywall plus flooring clearance. For 9 ft ceilings the precut is 104 5/8 inches.
Does a door or window need special framing?
Yes: a header sized for the load spans the opening, carried by jack studs nailed to full-height king studs on each side, with short cripple studs above and below. That package is why each opening adds roughly two full studs plus header material, which you should price separately for wide openings.