Framing Lumber Calculator
Whether you're adding a partition wall, framing a room addition, or building a new home, this calculator gives you an accurate lumber list. Enter total wall length, wall height, stud spacing, number of openings, and lumber size (2×4 or 2×6) to get stud count including king and trimmer studs around each door and window opening, plate boards for double top plate and single bottom plate, header lumber for openings, and a full cost estimate. The calculation follows standard residential framing practice: field studs at 16" or 24" OC, double top plate, single bottom plate, and 2 king + 2 jack studs per opening plus 4 cripple studs. Add approximately 10% to the stud count for corners, channel intersections, and blocking.
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How to Use This Calculator
- 1Enter your measurements in the fields above. Use the units shown next to each field (ft, in, etc.).
- 2Click Calculate to get your material estimate instantly.
- 3Review the highlighted result — it shows the key quantity you need to order.
- 4Use Copy Results to save your estimate, or bookmark the URL — your inputs are encoded in the link.
Pro tip: Always add 10% to your material order to account for waste, cuts, and defects.
Frequently Asked Questions
How many studs do I need for a 20-foot wall?
At 16-inch OC spacing, a 20-foot wall requires approximately 16 field studs plus 1 end stud = 17 studs, plus 6 boards for top and bottom plates. Add 2 extra studs per door or window opening (king + trimmer). Total is typically around 23–25 studs for a plain 20-foot wall.
What is the difference between 16" OC and 24" OC framing?
16-inch on-center (OC) is the standard residential framing spacing and uses more studs. 24-inch OC is used in advanced framing (Optimum Value Engineering) to reduce lumber use and improve insulation. 24-inch OC requires engineered headers and may need structural review in high-wind or seismic zones.
Should I use 2×4 or 2×6 framing for exterior walls?
2×6 framing is recommended for exterior walls in cold climates — the deeper cavity allows R-21 or R-23 insulation vs. R-13 in 2×4 walls, significantly improving energy efficiency. Interior partition walls are always 2×4. Exterior walls in warm climates (Zone 1–3) can often use 2×4 framing cost-effectively.
How much does it cost to frame a wall per linear foot?
Framing lumber for a standard 8-ft 2×4 wall costs approximately $6–$10 per linear foot in material (studs + plates). Labor adds $8–$12 per linear foot for professional framing. A 20-foot interior wall runs about $280–$400 installed, or $120–$200 in materials only for DIY.