Lumber Calculator - Calculate Studs, Plates, and Total Linear Feet
Free lumber calculator. Calculate studs, plates, and total linear feet for wall framing. Supports 2x4 and 2x6 with 16 or 24 inch spacing.
Wall Configuration
Framing Details
3 studs per corner for drywall backing
2 studs per intersection for backing
Enter wall dimensions to see results.
About This Calculator
How to Calculate Lumber for Wall Framing
Measuring Tips
- Measure the total linear feet of all exterior and interior walls
- Count all corners, T-intersections, and wall junctions
- Mark all door and window locations with rough opening sizes
- Account for wall height - standard is 8 feet, but some walls are 9 or 10 feet
- Add 10% waste factor for cuts, defects, and mistakes
Lumber Size Guide
| Nominal Size | Actual Size | Common Use |
|---|---|---|
| 2×4 | 1.5" × 3.5" | Standard wall framing |
| 2×6 | 1.5" × 5.5" | Exterior walls, better insulation |
| 2×8 | 1.5" × 7.25" | Headers, floor joists |
| 2×10 | 1.5" × 9.25" | Large headers, deck joists |
| 4×4 | 3.5" × 3.5" | Posts, structural supports |
Tips for Best Results
- Use kiln-dried lumber for interior framing to minimize shrinkage
- Check each stud for straightness before installing
- Use pressure-treated lumber for bottom plates on concrete slabs
- Install fire blocking in tall walls and between floors
- Order lumber in standard lengths (8', 10', 12', 14', 16') to minimize waste
Frequently Asked Questions
How do I calculate lumber for wall framing?
Measure the total linear feet of all walls. Divide by stud spacing (16" or 24" on center) to get stud count. Add studs for corners (3-4 per corner), intersections (2 per T-intersection), and openings (2 per door/window). Calculate plates: 3 plates × wall length ÷ stud length. Add 10% for waste.
How far apart should wall studs be?
Standard stud spacing is 16 inches on center for load-bearing walls and exterior walls. For non-load-bearing interior walls, 24 inches on center is acceptable and uses fewer studs. Always follow local building codes and engineering requirements.
How many studs do I need for a 20-foot wall?
For a 20-foot wall with 16" on-center spacing: 20 × 12 ÷ 16 = 15 spaces, so 16 studs minimum. Add 2 for each end/corner, 2 for each opening, and 10% waste. A simple 20-foot wall with no openings needs approximately 18-20 studs.
What is the difference between 2x4 and 2x6 for walls?
2x4 walls are 3.5" thick and typically use R-13 insulation. 2x6 walls are 5.5" thick, allow R-19 or R-21 insulation, and provide better energy efficiency. 2x6 studs are stronger for taller walls but cost more. 2x6 walls are required by code in some climate zones.
How do I account for doors and windows in lumber calculations?
For each door or window opening, add 2 full-length king studs and 2 shorter jack (trimmer) studs per opening. Add a header sized to the opening width (typically double 2x material). Subtract the opening width from plate calculations but keep full-length top plates for structural continuity.