Linear Foot to Square Foot Calculator
Convert board length and width into total area coverage.
Inches
Feet
Total Area:
0 sq. ft.
Width Used (ft):
0 ft
Total Estimated Cost:
$0.00
How to Convert Linear Feet to Square Feet
A linear foot is a measure of length (12 inches), while a square foot is a measure of area (length × width). To convert linear feet to square feet, you must know the width of the material you are measuring.
The mathematical formula for the conversion is:
Square Feet = Linear Feet × (Width in Inches / 12)
OR
Square Feet = Linear Feet × Width in Feet
OR
Square Feet = Linear Feet × Width in Feet
Real-World Example
If you are buying decking boards that are 6 inches wide and you have 200 linear feet of them, the calculation would be:
- Convert width to feet: 6 inches ÷ 12 = 0.5 feet.
- Multiply by length: 200 linear feet × 0.5 feet = 100 square feet.
Common Width Conversions
| Common Material | Width (Inches) | Multiplier (to Sq Ft) |
|---|---|---|
| 1×4 Board | 3.5″ | 0.2917 |
| 1×6 Board | 5.5″ | 0.4583 |
| 2×8 Board | 7.25″ | 0.6042 |
Why Does This Matter?
Contractors and flooring suppliers often price materials by the linear foot, but your floor plan or blueprints are measured in square feet. Using this calculator helps you determine exactly how much material to order for projects like fencing, siding, trim, and hardwood flooring.