About the Wall Framing Calculator
This wall framing calculator estimates the lumber for a standard stick-framed wall: common studs at your chosen on-center spacing, the extra king and jack studs around each door or window, extra studs for corners and wall intersections, the bottom plate and doubled top plate, and the header stock over openings. It also gives the stud cut length for the wall height after allowing for three 1½-inch plates.
It is useful for basement finishing, garage and shed walls, partition walls and additions, whether you are building a shopping list or checking a framer’s takeoff. Enter the wall length and height, pick 16 or 24 inch spacing, and add the number of openings and corners.
The estimate follows the common rule of one stud per spacing plus one, two extra studs per opening and two per corner or T-intersection, then adds a waste allowance for crooked or split boards. Structural headers must be sized to the span and load from your local code tables.
With the default inputs, the total studs to buy is 27. Change any value above to recalculate instantly.
How to use the wall framing calculator
- 1Enter the wall length and the height from subfloor to ceiling framing.
- 2Choose the stud spacing required by your plans or local code.
- 3Add the number of doors and windows and their average width.
- 4Count corners and places where other walls tie in.
- 5Set waste and prices to see total studs, plates, header stock and cost.
Formula and method
Common studs are one per spacing interval along the wall plus one to close the end. Each door or window adds roughly two studs net (a king and a jack stud on each side, less the common studs that fall inside the opening), and each corner or wall intersection adds two for backing. A waste allowance covers warped or split boards.
Plates are one bottom plate and two top plates, so three times the wall length in linear feet, divided by the board length you buy. Stud cut length is the wall height minus 4½ inches for the three 1½-inch plates. Header stock assumes a doubled header 3 inches longer than the rough opening so it bears on the jack studs.
- Length
- Wall length (ft)
- Spacing
- Stud spacing on center (in)
- Openings
- Number of doors and windows
- Corners
- Corners and T-intersections in the wall
Worked examples
20 ft wall at 16 in on center with two openings
240 in ÷ 16 = 15 spaces, so 16 common studs. Two openings and two corners add 8, giving 24, and 10% waste rounds up to 27 studs. Plates need 60 linear feet, or four 16 ft boards, and the cost is 27 × $4.25 + 4 × $9 = $150.75.
12 ft wall, 9 ft high, 24 in spacing, one 6 ft window
144 in ÷ 24 = 6 spaces, so 7 common studs plus 2 for the window gives 9. The studs are cut to 108 − 4.5 = 103.5 in. Three 12 ft plates cover the 36 linear feet, and the doubled header uses 2 × 6.25 = 12.5 ft of stock.
Frequently asked questions
How many studs do I need per foot of wall?+
At 16 in on center it is about 0.75 studs per linear foot plus one; at 24 in it is about 0.5 per foot plus one. Then add studs for openings, corners and waste.
Should I use 16 or 24 inch stud spacing?+
16 in on center is standard for load-bearing walls and gives stiffer drywall. 24 in spacing (advanced framing) uses less lumber and leaves more room for insulation where your code and design allow it.
What length should studs be for an 8 ft wall?+
With a single bottom plate and double top plate, studs are 96 − 4.5 = 91.5 in. Precut 92-5/8 in studs are made for a slightly taller 8 ft 1-1/8 in wall that suits 8 ft drywall plus a ceiling layer.
How many extra studs does a window need?+
A framed opening has a king stud and a jack (trimmer) stud on each side, plus cripples above and below. Because some common studs are removed, a practical estimate is about two extra studs per opening.
How do I size a header?+
Header size depends on the opening width, whether the wall is load bearing, and the loads above. Use the header span tables in your building code (for example IRC Table R602.7) or have one engineered.