There are hundreds of sites that offer conversions from linear foot measurements to board foot measurements and visa versa. In Crate Pro > Inventory > Lumber the calculation has been done for you.

Unlike square footage, the board footage is a measurement of volume. It is used when purchasing multiple boards of lumber in various sizes.  By definition, one board foot of lumber is one square foot that is one inch thick.

For lumber you may select a Tracking Level by Linear Foot (Linear Meter) or Board Foot (Cubic Meter)  Your preferred Tracking Level is based on what's easiest for you to enter your costs based on one or the other unit of measure.  Board Foot is most common.

Why select one over the other?

> If you select your Tracking Level to be by linear foot (linear meter), all of your reports will display usage in linear feet only. These reports are the Manager's reports and the ISPM15 reports. 

> If you select your Tracking Level to be by board foot (cubic meter),  your cut lists will display lumber by linear foot, and your Manager's reports & ISPM15 reports will be in board feet.

A very easy calculator to use that I recommend to not only determine board foot (cubic meter) but will also determine your costs by board foot in many units of measure.

Courtesy of Timber Creek and FCA Packaging company

Pay attention to the units of measure as you may need to change them to your preferred UM. This same site will also determine your costs based on BF (BF Costing Solution Article)

If you want to learn to do it yourself, here are the instructions.

The following is provided by: Hardwood  If you want to be geek smart... Make sure you note when formulas are using length in feet or in inches.