Wall framing calculator

Every line shows the quantity to buy and how StudSheet got it: the spacing, the waste and the package size, so you can check it before the supply house or the quote.

In Canada (3.66 m wall, 2.44 m tall, 1 door)

Set to Canada, the Sheet works the job out again for Ontario: metric sizes, bag sizes, the frost depth and the code notes. It doesn't just convert feet to meters. The first lines:

• 15 studs, 2×4: Layout: 10 studs at 406 mm on center over 3.66 m − 2 replaced at the door opening + 2 king + 2 jack + 1 cut into a header and 2 cripples = 13. Plus 10% for warped boards. Cut each stud to fit (about 2.36 m).
• 1 board, 2×4: One continuous plate for 3.66 m. Cut it out inside the doorway after the wall is fastened.
• 1 board, 2×4: Single top plate: building codes usually allow one on a non-bearing interior wall — ask your building department.
• ≈98 screws (1 box of 100), 76 mm framing screws: 4 per stud (2 top, 2 bottom), 6 per jack stud, 8 per header, 4 per cripple, plus plate-to-joist and plate-to-floor fastening. With a framing nailer, use 16d nails instead.
• 6 sheets, Drywall 13 mm: 14.2 m² to cover (2 sides, door openings removed) + 12% for cuts, ÷ 3.0 m² per sheet.
• ≈185 screws (0.5 kg), Drywall screws, coarse thread: 7 studs behind each sheet × 4 screws per stud (USG: 406 mm apart on walls with 406 mm framing) × 6 sheets + 10%. About 550 per kg.

1. Find the ceiling joists with a stud finder and decide how the top plate gets fastened.
2. Snap the wall line on the floor. Transfer it to the ceiling with a plumb bob or laser at both ends.
3. Cut the plates, lay them side by side and mark the stud layout every 16″ plus the door rough opening (34″ × 82-1/2″).
4. Fasten the top plate to the joists and the bottom plate to the floor.
5. Measure each stud position floor-to-ceiling (they vary), cut, and screw or toe-nail it in.
6. Frame each door: king studs, jack studs, a header (flat 2×4), cripples. Then cut the bottom plate out of the doorway.
7. Check the wall for plumb every few studs before drywall.
8. Hang drywall horizontally, ½″ off the floor, joints staggered; screws 16″ apart into studs.
9. Tape and mud: bedding coat, fill coat, finish coat — overnight between each. Sand lightly, then prime.

Must-have tools first, then the ones that help and the ones to rent for the day.

Mistakes that cost a callback or a second trip

• Top plate with nothing to grab: If the ceiling joists run along the wall, screws go into drywall only and the wall wobbles. Find the joists first; add blocking.
• Cutting every stud to one length: Floors and ceilings are never flat. Measure at each stud location and cut to fit — a stud ⅛″ long bows the ceiling.
• Cutting the doorway plate too early: Leave the bottom plate continuous until the wall is fastened, or the opening racks out of square.

What the calculator assumes

• Non-load-bearing partition: single bottom plate + single top plate (IRC R602 allows a single top plate on non-bearing interior walls).
• Studs are cut to fit: height − 3″ of plates, bought as the next standard length (8′–16′) and cut several per board when short.
• Stud layout: one at each end plus one every 16″ on center.
• Each door: rough opening = door width + 2″ by 82½″ tall; 2 king + 2 jack studs. Header: a flat 2× when the top plate is within 24″ above it (IRC permits this in non-bearing walls for openings up to 8 ft); otherwise two 2×s on edge.
• Non-bearing 2×4 walls up to 14 ft tall (IRC Table R602.3(5)); fireblocking row when taller than 10 ft (IRC R302.11).
• +10% studs for warped or split boards.
• Drywall: net area (door openings removed) + 12% for cuts.
• Drywall screws: USG spacing — 16″ apart on walls with 16″ framing, 12″ with 24″ framing.
• Joint compound ≈ 10 gal per 1,000 sq ft and paper tape ≈ 370 ft per 1,000 sq ft (USG).
• Bottom plate on a concrete slab: pressure-treated (IRC decay protection).

The Sheet sets its code notes for the job's state or province. These are New Jersey's and Ontario's; the code reference has more. Always confirm with your building department.

• Permits: a job like this usually needs none, but towns set their own rules. Ask your building department if you're not sure.

What materials do I need to frame and drywall an interior wall?

For the worked example, a 12′ wall, 8′ tall, 1 door, the Sheet counts 8 lines with waste included, starting with 2×4 (15 studs), 2×4 (1 board), 2×4 (1 board), 3″ framing screws (≈98 screws (1 box of 100)). Each line's math is in the table above. Put in your own sizes in the interior wall calculator and every line is counted again.

How long does it take to frame and drywall an interior wall, and can I do it myself?

About 14 to 20 hours for the worked example, in 9 steps. StudSheet stamps it DIY OK: you can do this.

What tools do I need to frame and drywall an interior wall?

29 in all. The must-haves start with tape measure (25 ft), carpenter's pencil, chalk line, speed square, 4-ft level, stud finder. On the Sheet you mark each one as owned, to buy or to rent.

Stuck while you frame and drywall an interior wall? Ask in the Framing and walls group of the StudSheet community with this Sheet attached. Homeowners who've done it and verified pros answer, and anyone can read it.

• Carpentry and framing for contractors: run this takeoff at your own prices, send the estimate, and get it signed and the deposit paid.
• Install baseboard and trim (14′ × 12′ room): Baseboard, shoe, door casing and crown for a room: lengths that fit your walls, coped and mitered corners, nails, caulk and paint.
• Closet shelving (6′ reach-in closet): Wire or wood shelves for a reach-in or walk-in closet: shelf lengths that fit, rods, brackets on studs, and the anchors for the rest.
• Build interior or basement stairs (Inside stairs, 8′ 9″ rise): Stringers, treads, risers, skirt boards and a handrail for a straight run or one with a landing — laid out to the code’s rise, run and headroom.
• Build a storage shed (8′ × 10′ shed): A stick-built gable or lean-to shed: foundation, floor, wall framing, rafters, sheathing, siding, roofing, doors — every board counted, with the permit size limits where you live.
• Build a media wall (12′ media wall, 65-inch TV, 6 niches): A framed false wall for the TV: studs, drywall, niches, a recessed TV panel and LED strips, with the steps and a front elevation.
• All 45 Sheets, across 16 trades.
• Code reference: frost depths, guard heights, stairs, retaining walls.