Framing Lumber Calculator
Calculate the studs, plates, and board footage needed to frame a wall in seconds. Enter your wall length, height, and stud spacing — the calculator handles the standard framing math so you know exactly what to order before you break ground.
How to use this calculator
- Enter your wall length in feet — measure the total linear footage of the wall run.
- Set the wall height (8 ft is standard; 9 ft is common in newer construction).
- Choose your stud size (2×4 standard, 2×6 for exterior energy-efficient walls) and stud spacing.
- Read your stud count, plate linear footage, total board feet, and cost estimate.
How we calculate this
Stud count is calculated as: (wall length ÷ stud spacing) + 1, rounded up, then +2 for the king studs at each end. Plates are calculated as 3 × wall length (two bottom plates + one top plate is the standard for load-bearing walls; non-load-bearing walls use two plates). Headers are estimated at one 2× member per 4 feet of wall for rough openings. Total board feet are summed from all members using the standard (nominal thickness × nominal width × length) ÷ 12 formula. A 10% waste factor is included by default.
What this calculator doesn't include
This calculator estimates lumber for a single straight wall section. It does not account for corners, intersecting walls, window or door rough openings (beyond the header estimate), blocking, fire stops, or structural beams. Complex floor plans should be broken into individual wall runs and calculated separately. Hardware (nails, anchor bolts, straps) is not included.
Example estimates — Framing Lumber
Pre-calculated for common project sizes. Includes 10% waste. Cost at ~$0.85/BF — adjust in the calculator above.
| Wall Size & Spacing | Studs | Plate LF | Total BF | With Waste | Est. Cost |
|---|---|---|---|---|---|
| 10 ft × 8 ft, 16" OC | 9 | 30 LF | 68 BF | 74.8 BF | $63.58 |
| 16 ft × 8 ft, 16" OC | 13 | 48 LF | 101.33 BF | 111.46 BF | $94.74 |
| 20 ft × 8 ft, 16" OC | 16 | 60 LF | 125.33 BF | 137.86 BF | $117.18 |
| 24 ft × 8 ft, 16" OC | 19 | 72 LF | 149.33 BF | 164.26 BF | $139.62 |
| 10 ft × 9 ft, 16" OC | 9 | 30 LF | 74 BF | 81.4 BF | $69.19 |
| 20 ft × 9 ft, 16" OC | 16 | 60 LF | 136 BF | 149.6 BF | $127.16 |
| 32 ft × 8 ft, 16" OC | 25 | 96 LF | 197.33 BF | 217.06 BF | $184.50 |
| 40 ft × 8 ft, 16" OC | 31 | 120 LF | 245.33 BF | 269.86 BF | $229.38 |
| 10 ft × 8 ft, 24" OC | 6 | 30 LF | 52 BF | 57.2 BF | $48.62 |
| 20 ft × 8 ft, 24" OC | 11 | 60 LF | 98.67 BF | 108.54 BF | $92.26 |
Frequently asked questions
At 16" on-center spacing, you need approximately 1 stud per linear foot of wall (plus 1 extra at the end). At 24" on-center, it is roughly 0.75 studs per foot. Always add 10–15% for waste, blocking, and cripple studs around openings.
16" on-center (OC) is the most common spacing for load-bearing walls in North America and is required by most building codes for walls supporting floors or roofs. 24" OC is acceptable for non-load-bearing partition walls and can reduce material costs by about 25%. Always verify your local code requirements.
A standard framed wall uses three plates: one bottom (sole) plate and two top plates (the top plate and the double top plate that ties walls together). For non-load-bearing interior partitions, some builders use only two plates. Calculate 3× the wall length in linear feet of plate material for typical exterior or load-bearing walls.
2×4 studs are standard for interior partition walls and most exterior walls in mild climates. 2×6 studs are used for exterior walls when thicker insulation is required (common in cold climates and energy-efficient builds). 2×6 framing costs more but allows R-19 or R-21 batt insulation versus R-13 in 2×4 walls.
Yes — each opening requires king studs, trimmer (jack) studs, a header, and cripple studs above and/or below. A standard 3-foot door opening typically adds 4–6 extra stud equivalents. This calculator provides a baseline estimate; add 10–15% extra for walls with multiple openings.