Board Feet Calculator
Adjust the parameters below to compute materials and estimate project costs.
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Guidelines & Field Recommendations
• A nominal 1x6 board actually measures 3/4" x 5-1/2".
• A nominal 2x4 board actually measures 1-1/2" x 3-1/2".
Board Foot Unit: 1 BF = 12" W x 12" L x 1" thick (144 cu in).
Calculation Formulas & Steps
Board Feet (BF) = (Thickness (in) × Width (in) × Length (ft)) ÷ 12. Total BF = BF per piece × Quantity.
Worked Example (Step-by-Step Math)
Multiply thickness (in), width (in), and length (ft), then divide by 12.
BF = (1" × 6" × 8') ÷ 12 = 4 Board FeetMultiply by board count.
4 BF × 10 pcs = 40 Board FeetLumber Nominal vs Actual Size
Board footage uses NOMINAL sizing. Actual sizes are smaller.
| Project Condition | Reference Metric |
|---|---|
| 1 x 6 Board | Actual size: 3/4" x 5-1/2" |
| 2 x 4 Board | Actual size: 1-1/2" x 3-1/2" |
Critical Mistakes to Avoid
- !Mistake 1: Using actual measurements instead of nominal measurements, leading to under-ordering board footage.
- !Mistake 2: Not adding a 10-15% waste allowance for hardwood grading.
Frequently Asked Questions
What is the difference between board footage and linear footage?
Linear footage measures only the length of a board. Board footage measures total volume, representing a block of wood 12 inches wide, 12 inches long, and 1 inch thick. Linear footage ignores width and thickness, while board footage includes them.
What is the difference between nominal size and actual size lumber?
Nominal size is the rough-sawn dimension of lumber before it is planed smooth. Actual size is the finished size you buy. A nominal 2x4 board actually measures 1-1/2" x 3-1/2". Board foot calculations are always performed using nominal dimensions.
How do I convert linear feet to board feet?
To convert linear feet to board feet, multiply the nominal thickness (inches) × nominal width (inches) × linear length (feet) and divide by 12. For example, a 10-foot long 2x6 board contains: (2 × 6 × 10) ÷ 12 = 10 board feet.
What does 4/4 lumber thickness mean in hardwood buying?
Hardwood lumber thickness is measured in quarters of an inch. A 4/4 (four-quarter) board is nominally 1 inch thick. After drying and planing, it typically has an actual thickness of 13/16" to 3/4".
Why is hardwood lumber priced by board feet instead of linear feet?
Hardwoods are sold in rough-sawn random widths and lengths from the sawmill, rather than uniform pre-cut sizes. Pricing by board feet ensures buyers pay for the exact volume of wood they receive.
What is one board foot of lumber?
A unit of volume equal to a board 12 inches wide, 12 inches long, and 1 inch thick (144 cubic inches).
Does plywood or sheet goods use board foot pricing?
No. Plywood and other sheet goods (MDF, OSB) are engineered panels and are priced per 4x8 sheet, not by board feet.
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