Convert Cubic Inch (Lumber) to Board Foot
Live bidirectional calculator for Cubic Inches (Lumber) (in³) and Board Feet (FBM) with verified formula and conversion charts.
Lumber Volume9 units
How the Calculation Works (Linear Scaling)
Since 1 Board Foot = 144 Cubic Inches (Lumber), divide the value in Cubic Inches (Lumber) by 144.
Cubic Inch (Lumber) to Board Foot Conversion Table
Precomputed values for quick reference and printing.
| Cubic Inch (Lumber) | Board Foot |
|---|---|
| 1 in³ | 0.0069 FBM |
| 2 in³ | 0.0139 FBM |
| 3 in³ | 0.0208 FBM |
| 4 in³ | 0.0278 FBM |
| 5 in³ | 0.0347 FBM |
| 6 in³ | 0.0417 FBM |
| 7 in³ | 0.0486 FBM |
| 8 in³ | 0.0556 FBM |
| 9 in³ | 0.0625 FBM |
| 10 in³ | 0.0694 FBM |
| 15 in³ | 0.1042 FBM |
| 20 in³ | 0.1389 FBM |
| 25 in³ | 0.1736 FBM |
| 30 in³ | 0.2083 FBM |
| 40 in³ | 0.2778 FBM |
| 50 in³ | 0.3472 FBM |
| 75 in³ | 0.5208 FBM |
| 100 in³ | 0.6944 FBM |
| Board Foot | Cubic Inch (Lumber) |
|---|---|
| 1 FBM | 144 in³ |
| 2 FBM | 288 in³ |
| 3 FBM | 432 in³ |
| 4 FBM | 576 in³ |
| 5 FBM | 720 in³ |
| 6 FBM | 864 in³ |
| 7 FBM | 1008 in³ |
| 8 FBM | 1152 in³ |
| 9 FBM | 1296 in³ |
| 10 FBM | 1440 in³ |
| 15 FBM | 2160 in³ |
| 20 FBM | 2880 in³ |
| 25 FBM | 3600 in³ |
| 30 FBM | 4320 in³ |
| 40 FBM | 5760 in³ |
| 50 FBM | 7200 in³ |
| 75 FBM | 10800 in³ |
| 100 FBM | 14400 in³ |
📌 Standard Benchmark Reference Values
Exact nominal board volume: 1 inch thick × 12 inches wide × 12 inches long.
Exact RatioAbout Cubic Inch (Lumber) (in³)
An imperial unit of volume equal to 1/1728 of a cubic foot (exactly 1.6387064 × 10⁻⁵ m³). Exactly 144 cubic inches form one board foot.
History: Standard fundamental customary submultiple for precision woodworking and millwork.
Common Uses: Fine cabinetry joinery volume, dimensional hardwood offcuts, wood carving blank volumes.
About Board Foot (FBM)
A specialized unit of lumber volume in the United States and Canada, defined as the nominal volume of a one-foot length of a board one foot wide and one inch thick (1 in × 12 in × 12 in = 144 in³ ≈ 0.00235974 m³).
History: Developed in early North American sawmills to measure commercial rough-sawn lumber volume before planing and dressing.
Common Uses: Commercial lumber pricing, rough hardwood sales, architectural framing lumber takeoffs.
❓ Frequently Asked Questions
How many Board Feet are in 1 Cubic Inch (Lumber)?
There are exactly 0.006944 Board Feet in 1 Cubic Inch (Lumber) (1 in³ = 0.006944 FBM).
What is the formula to convert Cubic Inch (Lumber) to Board Foot?
The formula is: Board Foot = Cubic Inch (Lumber) / 144. Since 1 Board Foot = 144 Cubic Inches (Lumber), divide the value in Cubic Inches (Lumber) by 144.
How do I convert 1 in³ to FBM manually?
To convert 1 in³ to FBM: apply the formula Board Foot = Cubic Inch (Lumber) / 144. Substituting gives: 1 / 144 = 0.0069 FBM.