What Is the Square Feet to Linear Feet Calculator?
This calculator converts a coverage area measured in square feet into the linear feet of material you need, based on the width of the boards or planks. It is useful for flooring, decking, fencing, paneling, and lumber projects where products are sold by the linear foot but you know your area in square feet.
How to Use It
Enter the total area in square feet you want to cover, then enter the board width in inches (the actual face coverage of a single board or plank). The calculator returns the total linear feet of material required. Remember to add a waste allowance (typically 5–10%) for cuts, defects, and pattern matching.
The Formula Explained
The conversion relies on a simple relationship. One square foot equals 144 square inches. A board that is w inches wide covers w square inches per inch of length. The formula is:
$$\text{Linear Feet} = \frac{\text{Area (sq ft)} \times 12}{\text{Board Width (in)}}$$
The factor 12 converts feet to inches in the numerator so the units cancel cleanly, leaving an answer in feet.
Worked Example
Suppose you need to cover 200 square feet of floor with planks that are 5 inches wide. $$\text{Linear Feet} = \frac{200 \times 12}{5} = \frac{2400}{5} = \textbf{480 linear feet}$$ If your boards come in 8-foot lengths, that is about 60 boards before adding waste.
FAQ
Should I use nominal or actual board width? Use the actual coverage width. A "6-inch" board often covers only 5.5 inches, which changes the result.
Does this include waste? No. Add 5–10% extra to the linear feet for cuts and mistakes.
Can I convert linear feet back to square feet? Yes: \(\text{square feet} = \frac{\text{linear feet} \times \text{width in inches}}{12}\).
