Framing Calculator
Actual dimensions: 1.5" × 3.5". Common for interior and standard exterior walls.
3 studs per corner — most common, solid nailing surface.
Enter Wall Dimensions
Fill in the wall length, height, stud spacing, and lumber size above to see your complete framing material list — studs, plates, sheathing sheets, and estimated cost.
How to Use This Framing Calculator
Enter Wall Dimensions
Type in your wall length and height using the feet and inches fields. Use the quick-select buttons for 8, 9, or 10-foot standard ceiling heights. For a 20-foot 6-inch wall, enter 20 in the feet box and 6 in the inches box.
Choose Lumber and Spacing
Select your stud spacing (16" OC is standard residential), lumber size (2×4 for most walls, 2×6 for exterior with added insulation), wall type (interior vs. load-bearing exterior), and foundation type (slab or subfloor platform). For subfloor builds, enter your rim joist width so the finished stud length is calculated correctly.
Add Corners, Partitions, and Openings
Enter the number of corners and partition wall intersections. Switch to "With Doors & Windows" mode and click "Add Door" or "Add Window" to enter each opening's width and height. The calculator automatically sizes headers per IRC R602.7 and computes king, jack, and cripple stud counts.
Review Results and Export
Review your total stud count (with waste), plate linear footage, sheathing sheet count, board feet, and optional cost estimate. Use the visual bar chart to understand cost distribution. Click "Export CSV" to download the full material list for your records or to share with a contractor.
Frequently Asked Questions
What is the standard stud spacing for residential walls?
The most common stud spacing in North American residential construction is 16 inches on center (OC). This spacing is used for the majority of interior and exterior walls in homes because it balances structural strength, ease of framing, and alignment with standard 4-foot sheathing panel widths. Twelve-inch OC spacing is used for high-load walls, tile-backed walls, or walls supporting heavy shear loads. Twenty-four-inch OC spacing is used in advanced framing (OVE) to reduce lumber use and improve insulation space, and is acceptable in many jurisdictions for non-load-bearing walls. Always verify with your local building department before using non-standard spacing.
What is a California corner and how does it save lumber?
A California corner (also called an open corner or energy corner) uses two studs instead of three at exterior wall corners. Traditional framing installs three studs at each corner — two for nailing and one as a spacer — creating a solid wood block with poor insulation access. The California corner replaces the middle spacer stud with a drywall clip or a small backer block, leaving the interior corner space available for insulation batts. This reduces lumber use by one stud per corner, improves thermal performance, and is part of the OVE (optimized value engineering) approach to advanced framing. It is structurally equivalent to a traditional corner when properly detailed.
How are header sizes determined for doors and windows?
Header sizes are determined by the IRC R602.7 span table, which specifies minimum lumber sizes based on opening width, wall type (interior non-load-bearing, exterior non-load-bearing, or exterior load-bearing), and the lumber species group. For example, an exterior load-bearing 2×4 wall with a 3-foot opening requires a Double 2×4 header, while a 7-foot opening in the same wall requires a Double 2×10 or Double 2×12. Wider openings above 10 feet generally require an LVL (laminated veneer lumber) beam engineered for the specific loads. This calculator uses the IRC R602.7 table for standard residential conditions with gravity loads only.
Why is a 15% waste factor recommended?
A 15% waste factor accounts for several real-world losses during framing: off-cuts from cutting studs to finished length, pieces that get discarded due to knots or damage, studs cut incorrectly and replaced, short blocks used as spacers, and miscellaneous blocking not included in the main count. On a simple straight wall with no openings, 10% waste may be sufficient. For complex walls with many openings, corners, and partition intersections, 15–20% is more prudent. The waste factor in this calculator applies only to studs; plates and sheathing quantities are already rounded up to whole boards and sheets, which inherently includes some waste.
What is the difference between slab and subfloor foundation type?
On a slab-on-grade foundation, the bottom plate sits directly on the concrete slab, so the finished stud length equals the wall height minus the three plate thicknesses (3 × 1.5 inches = 4.5 inches). On a subfloor (platform framing) foundation, the wall sits on top of the floor platform — including the rim joist and subfloor sheathing. These additional layers reduce the available stud height. For example, a wall with a 2×8 rim joist (7.25 inches) and 3/4-inch subfloor sheathing on a platform reduces the finished stud length by 8 inches compared to slab. This calculator asks for the rim joist width and subfloor thickness when the subfloor option is selected.
How do I calculate how many 8-foot boards to buy for plates?
Plate lumber must be purchased in standard lengths — 8, 10, or 12 feet. Because plates run the full wall length (and must be a continuous or lapped run), you need to know how many whole boards to purchase. This calculator divides the total plate linear footage by the board length and rounds up to the nearest whole board. For three plates (one bottom, two top) on a 20-foot wall, the total plate footage is 60 linear feet. At 8 feet per board, you need 8 boards per plate layer, or 24 boards total. The calculator shows this count for 8-foot, 10-foot, and 12-foot board lengths so you can choose the most cost-effective option at your lumber yard.