Quickly convert linear feet into square feet using width in inches or feet. Ideal for flooring strips, boards, planks, trim with known face width, fabric rolls, and other materials sold by the linear foot.
Enter the total linear feet and material width to calculate total area in square feet.
Enter values and click Calculate.
Tip: If width is entered in inches, the calculator automatically converts inches to feet using ÷ 12.
Understanding the difference between linear feet and square feet is essential when estimating materials, comparing product prices, and avoiding costly purchasing mistakes. A linear measurement tells you how long something is. An area measurement tells you how much surface it covers. If you have a product sold by linear feet but your project is measured in area, conversion is the bridge between accurate planning and budget overruns.
This page gives you a fast calculator and a practical reference guide you can use on real projects. Whether you are working on home renovation, finish carpentry, shelving, wall coverings, countertops, or landscape borders, the same core conversion rules apply.
A linear foot is simply a one-dimensional length measurement equal to 12 inches. It only describes distance along a line and does not include width or thickness. For example, if you buy 30 linear feet of trim, you are purchasing pieces with a combined length of 30 feet.
Linear footage is common for products sold by length, such as boards, molding, pipes, fencing, cable, and fabric. Because it does not include width, it cannot directly tell you area. That is why converting from linear feet to square feet requires one additional dimension: width.
A square foot is a two-dimensional area measurement. One square foot represents a square that is 1 foot long and 1 foot wide. Unlike linear feet, square feet account for both length and width. Flooring, wall surfaces, and many material estimates are typically expressed in square feet because the goal is to cover an area, not just run along a line.
When your supplier lists a product by linear feet but your project scope is in square feet, converting correctly helps you order the right quantity.
The standard conversion is:
Square feet = Linear feet × Width (in feet)
If your width is given in inches, convert to feet first:
Width in feet = Width in inches ÷ 12
Then apply the main formula. This is exactly what the calculator on this page does automatically.
For many projects, adding 5% to 15% waste is realistic. Complex layouts, diagonal installations, and high-cut environments may need more.
Example 1: Trim board coverage
You have 180 linear feet of trim with a visible width of 5 inches.
Width in feet = 5 ÷ 12 = 0.4167
Area = 180 × 0.4167 = 75.0 square feet
Example 2: Plank material
You purchase 260 linear feet of planks that are 7.25 inches wide.
Width in feet = 7.25 ÷ 12 = 0.6042
Area = 260 × 0.6042 = 157.1 square feet
Example 3: One-foot-wide material
If material width is exactly 12 inches (1 foot), linear feet and square feet are numerically equal.
95 linear feet × 1 foot = 95 square feet.
Use this table for quick estimates before final calculation.
| Width | Width (Feet) | Conversion Factor (Sq Ft per LF) | 50 LF | 100 LF | 200 LF |
|---|---|---|---|---|---|
| 3 in | 0.25 | 0.25 | 12.5 | 25 | 50 |
| 4 in | 0.3333 | 0.3333 | 16.67 | 33.33 | 66.67 |
| 5 in | 0.4167 | 0.4167 | 20.83 | 41.67 | 83.33 |
| 6 in | 0.5 | 0.5 | 25 | 50 | 100 |
| 8 in | 0.6667 | 0.6667 | 33.33 | 66.67 | 133.33 |
| 10 in | 0.8333 | 0.8333 | 41.67 | 83.33 | 166.67 |
| 12 in | 1 | 1 | 50 | 100 | 200 |
| 16 in | 1.3333 | 1.3333 | 66.67 | 133.33 | 266.67 |
| 24 in | 2 | 2 | 100 | 200 | 400 |
Use coverage width, not nominal width: Many materials have a nominal dimension and an actual exposed width. Always use the actual visible or installable width for area conversion.
Account for overlap: Some products overlap when installed. Effective coverage can be less than actual board width.
Include waste: End cuts, defects, and pattern alignment reduce usable area. Add a suitable waste percentage.
Round carefully: Keep at least 2–4 decimal places during calculations, then round final totals for ordering.
Verify units: Mixing inches and feet is the most common source of conversion errors.
If a supplier gives price per linear foot, convert to effective price per square foot to compare options fairly:
Price per square foot = Price per linear foot ÷ Width (in feet)
For example, if material is $3.00 per linear foot and 6 inches wide (0.5 feet), then effective area cost is $6.00 per square foot. This simple step makes quote comparison much more transparent.
Converting linear feet to square feet is simple once width is included. Use the calculator above to get accurate results instantly, and apply a practical waste factor for better ordering confidence. This approach improves material planning, cost control, and project execution whether you are a homeowner, contractor, estimator, or supplier.