Board Feet to Cubic Feet Converter
Enter the lumber volume in board feet below to convert it to cubic feet.
Convert Board Feet to Cubic Feet (ft³)
Enter a value in board feet (FBM) to convert to cubic feet (ft³) (ft³).
Board Foot to Cubic Foot Conversion Table
Table showing various board foot measurements converted to cubic feet. Click any preset value or arrow to load it into the converter.
| Board Feet (FBM) | Cubic Feet (ft³) (ft³) |
|---|---|
| 1 FBM | 0.0833333 ft³ |
| 2 FBM | 0.1666667 ft³ |
| 5 FBM | 0.4166667 ft³ |
| 10 FBM | 0.8333333 ft³ |
| 15 FBM | 1.25 ft³ |
| 20 FBM | 1.6666667 ft³ |
| 25 FBM | 2.0833333 ft³ |
| 30 FBM | 2.5 ft³ |
| 50 FBM | 4.1666667 ft³ |
| 75 FBM | 6.25 ft³ |
How to Convert Board Feet to Cubic Feet
To convert board feet to cubic feet, multiply the lumber volume by the following conversion ratio: 0.0833333 cubic feet/board foot.
Since one board foot is equal to 0.0833333 cubic feet, you can use this simple formula to convert:
The lumber volume in cubic feet is equal to the lumber volume in board feet multiplied by 0.0833333.
For example, here's how to convert 10 board feet to cubic feet using the formula above.
How Many Cubic Feet Are in a Board Foot?
There are 0.0833333 cubic feet in a board foot, which is why we use this value in the formula above.
Our board foot to cubic foot calculator automatically converts your lumber volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Board Feet and cubic feet are both units used to measure lumber volume. Keep reading to learn more about each unit.
What Is a Board Foot?
North American lumber volume unit equal to 1 ft × 1 ft × 1 in (144 in³ = 1/12 ft³). It serves as a primary reference unit for measuring lumber volume across scientific and practical applications. [1]
The board foot is classified as a US customary unit of lumber volume. Board Feet can be abbreviated as FBM; for example, 1 board foot can be written as 1 FBM.
As the primary coherent reference unit for lumber volume in this category, all other lumber volume units are mathematically anchored to the board foot (FBM).
In practice, board feet (FBM) are widely used across standard lumber volume applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a Cubic Foot?
A cubic foot is a unit of lumber volume equal to 12 board feet (FBM), the base unit for lumber volume. 1 cubic foot equals 12 board feet. [2]
The cubic foot is classified as a US customary unit of lumber volume. Cubic Feet can be abbreviated as ft³; for example, 1 cubic foot can be written as 1 ft³.
When working with cubic feet (ft³) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, cubic feet (ft³) are widely used across standard lumber volume applications within US customary workflows, engineering documentation, and technical data sheets.
When converting lumber volume between board feet (FBM) and cubic feet (ft³), keep full floating-point precision (1 FBM = 0.0833333 ft³; 1 ft³ = 12 FBM) during intermediate calculations and round only the final cubic foot figure to match your instrument tolerance.
More Board Foot & Cubic Foot Conversions
Need to calculate in the opposite direction? Use our cubic feet (ft³) to board feet converter (ft³ to FBM) to switch your starting unit immediately. You can also explore related tools such as converting board feet to thousand board feet (mbf), converting board feet to cubic meters (m³), or converting thousand board feet (mbf) to board feet.
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Volume - Lumber Metrology Standard — Board Feet (FBM) to Cubic Feet (ft³) (ft³)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Board Foot (FBM) & Cubic Foot (Timber) (ft³)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (FBM to ft³)