CALC-001 · DRAWING NO. L-001 · REV A
Lumber calculator.
Drafted to scale · cited sources · honest numbers
Select a nominal size, enter board length and quantity. The calculator returns board feet using nominal dimensions (industry pricing convention), actual dimensions for coverage, and a material-cost range.
◈ DRAFTING PANEL · LUMBER TAKEOFF · N.T.S.
SHEET L-001 · REV A
Redline · scope notice Board-foot quantity only. Does not calculate structural loads, spans, or joist spacing. Consult AWC NDS span tables for structural sizing. Board feet use nominal dimensions per lumber industry convention.
Note 01 · Field Procedure
How to order lumber
- Identify the nominal size you need. A '2x4' is 1.5 x 3.5 in. actual. Nominal dimensions are used for pricing; actual dimensions determine fit in the wall or deck frame.
- Measure the length you need in feet. Standard stock lengths run 8, 10, 12, 14, and 16 ft. Anything over 16 ft is special-order at most yards.
- Count how many boards. The calculator multiplies board feet per piece by your quantity and applies a waste factor based on use (framing 5%, decking 10%, trim 15%).
- If the lumber contacts ground or stays wet, specify pressure-treated. AWPA U1 defines use categories: UC4A for ground contact, UC3B for above-grade exterior framing.
Note 02 · Equation
The formula
BF = (T × W × L) ÷ 12
Tnominal thickness in inches
Wnominal width in inches
Lboard length in feet
Board feet use nominal dimensions for pricing. Actual face dimensions are smaller per PS 20.
Note 03 · Sanity Ranges
Lumber by project size
| T | Use case | Notes |
|---|---|---|
| 10-50 bf | Small project / shelving | A few boards. Buy at the yard; no delivery needed. |
| 100-200 bf | Deck frame / small addition | Budget for delivery. Check straight-edge quality on long boards. |
| 500-1,000 bf | Room addition / garage | Pallet pricing usually kicks in. Coordinate delivery with framing schedule. |
| 3,000+ bf | Whole-house frame | Negotiate mill-direct or bulk pricing. Factor in crane/boom truck for second-floor delivery. |
Note 04 · References
Sources
Authorities cited on this sheet
- AWC National Design Specification (NDS) · Structural design reference for wood construction. Span tables, fastener schedules, and load calculations. This calculator does not perform structural analysis.
- AWPA U1: Use Category System for Treated Wood · Defines pressure-treatment use categories. UC3B for above-grade exterior, UC4A for ground contact, UC4B for ground contact heavy duty.
- American Lumber Standard Committee (ALSC) PS 20 · Voluntary product standard for softwood lumber. Defines nominal-to-actual size conversions. A '2x4' is 1.5 x 3.5 in. actual.
PROJ MATERIALFOREMAN
SHT L-001 / 014
REV A · 2026-04-19
DRAWN MF