Linear Feet vs. Square Feet
Linear Feet measures length only. It's how lumber (like 2x4s) and decking boards are sold.Square Feet measures area (Length × Width). It's how rooms are measured for flooring.
The Conversion Formula
To convert, you simply need to turn the width of your board into feet and multiply it by the total length. For example, a standard deck board is nominally 6 inches wide (actually 5.5 inches, but often calculated at 6 for rough estimates or simplified math).
Common Material Widths
- Dimensional Lumber (2x4): 3.5 inches actual width
- Decking Boards: 5.5 inches actual width
- Hardwood Flooring: 2.25 to 5 inches
- Vinyl Planks: 6 to 9 inches
Frequently Asked Questions
How do I convert linear feet to square feet?
Multiply your linear footage by the width of the material in feet. If the width is in inches, divide it by 12 first. Formula: Linear Feet × (Width in inches / 12) = Square Feet.
Example: 100 linear feet of 6-inch board?
First, convert 6 inches to feet: 6 ÷ 12 = 0.5 ft. Then multiply: 100 ft × 0.5 ft = 50 square feet.
Why do I need to know linear feet?
Lumber, trim, decking, and fencing materials are often sold by the linear foot, but project areas are measured in square feet. This conversion helps you buy the right amount.