Board Foot Calculator

What a board foot calculator measures

A board foot is a volume unit used in the timber trade, especially for rough sawn lumber and hardwood stock. One board foot equals a board that is 1 inch thick, 12 inches wide, and 1 foot long. That makes a board foot calculator useful whenever you know the dimensions of the stock but need a standard buying unit for pricing or quantity planning.

This matters because timber yards often quote by board foot while builders and woodworkers may think in individual boards, cubic feet, or cubic metres. Converting everything into board feet helps you compare different board sizes on the same basis before you place an order.

Core board foot formula

The formula is straightforward once thickness and width are expressed in inches and length is expressed in feet. If you start in metric, the calculator converts the measurements first and then applies the same standard timber formula.

How to use the result when ordering timber

The most useful workflow is to calculate the board feet per piece first, then check the total board feet for the whole order. That lets you compare different thicknesses or board lengths without converting each quote manually. If you are shipping the order or checking storage space, the cubic-foot and cubic-metre outputs give a second practical view of the same stock volume.

For example, ten boards at 2 x 6 x 8 feet contain 80 board feet in total. If the supplier quotes a price per board foot, multiply that rate by 80 to estimate the material cost before waste, trimming, or grade selection are added.

What this estimate does not cover

A board foot calculator measures theoretical stock volume only. It does not adjust for planed size versus nominal size, grading, defects, moisture content, machining loss, or the waste created when you cut around knots and checks. Hardwood yards and softwood merchants may also use slightly different selling conventions depending on whether stock is rough, planed, or sold as finished dimensional lumber.

Use the result as a pricing and quantity-planning tool, then confirm how the specific supplier measures and bills its stock before ordering a large quantity of timber.