Board Feet to Square Feet Calculator

Last updated: 10 Sep 2025 | Author: Brij | Review By: Irshad

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Easily convert board feet to square feet with our free calculator. Perfect for woodworkers and contractors to estimate lumber coverage based on thickness.

Board Feet (BF):

1 board foot = 144 cubic inches

Thickness:

inches

Common thicknesses: 0.75", 1", 1.25", 1.5", 2"

Conversion Results

Square Feet:

sq ft

Board Feet Information

Board Foot Formula:
Board Feet = (Thickness × Width × Length) / 144
Where dimensions are in inches

Common Lumber Sizes:
- 1×4: 0.33 BF per foot
- 1×6: 0.5 BF per foot
- 2×4: 0.67 BF per foot
- 2×6: 1.0 BF per foot

Conversion Formula:
Square Feet = Board Feet / (Thickness ÷ 12)

Example Calculation:
10 BF at 1" thickness:
10 / (1 ÷ 12) = 120 sq ft

10 BF at 2" thickness:
10 / (2 ÷ 12) = 60 sq ft

When working with lumber, you may come across two common measurement units: Board Feet (BF) and Square Feet (sq ft). While board feet measure the volume of wood, square feet measure the surface area. Converting between these units helps carpenters, woodworkers, and contractors estimate how much lumber is needed for flooring, paneling, or furniture projects.

A Board Feet to Square Feet Calculator makes this conversion quick and accurate.

What is a Board Foot?

A board foot (BF) is a unit of volume used in the lumber industry. It represents a piece of wood that is 1 inch thick, 12 inches wide, and 12 inches long.