Math Calculator
Board Foot Calculator.
Estimate lumber volume in board feet from thickness, width, length, and quantity — with cubic feet for reference.
Board Feet
4bf
Cubic Feet0.333 ft³
Cubic Inches576 in³
Length Used8 ft
Pieces1
What Is a Board Foot Calculator?
A board foot calculator converts lumber dimensions into board feet — the standard volume unit used when buying or selling hardwood and softwood. Enter thickness and width in inches, length in feet or inches, and quantity.
How to Calculate Board Feet
Board Feet = (T × W × Lft) / 12 × Qty
Thickness (T) and width (W) are in inches; length must be in feet. If you measure length in inches, divide by 12 first. One board foot equals 1/12 cubic foot.
Frequently Asked Questions (FAQs)
How do you calculate board feet?
Board Feet = (Thickness × Width × Length in feet) / 12 × Quantity. Convert inch lengths to feet by dividing by 12.
What is a board foot?
A board foot is lumber volume equal to 1″ × 12″ × 1′ (144 cubic inches).
How many cubic feet are in a board foot?
One board foot = 1/12 cubic foot (≈ 0.0833 ft³).