Board foot calculator

One board foot is a 12 × 12 × 1 inch volume. Board feet = thickness in inches × width in inches × length in feet × count ÷ 12.

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Thickness (inches)

Width (inches)

More inputs and assumptions

Length (feet)

Boards

Answer

…

One board foot is a 12 × 12 × 1 inch volume. Board feet = thickness in inches × width in inches × length in feet × count ÷ 12.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

Saved scenario

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Formula and assumptions

Use the dimensions relevant to the quote: nominal and finished dimensions differ. This estimates volume, not a species-specific weight or structural capacity.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Board foot calculator

One board foot is a 12 × 12 × 1 inch volume. Board feet = thickness in inches × width in inches × length in feet × count ÷ 12.

Use the dimensions relevant to the quote: nominal and finished dimensions differ. This estimates volume, not a species-specific weight or structural capacity.

Next: Roof pitch calculator

A worked example

With thickness (inches) = 1, width (inches) = 6, length (feet) = 8, boards = 10, the board feet is 40.

Next: Fence calculator

Before you use the result

Use the dimensions relevant to the quote: nominal and finished dimensions differ. This estimates volume, not a species-specific weight or structural capacity.

Example results for thickness (inches)

These examples use Width (inches): 6; Length (feet): 8; Boards: 10. They are reference calculations, not recommended settings.

Thickness (inches)	Board feet
0.5	20
1	40
2	80

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ToolOctopus. “Board foot calculator.” Updated 2026-09-26. https://tooloctopus.com/board-foot-calculator.

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