Linear feet measure length along a straight line, where one linear foot is 12 . This page turns a square-foot area into the running length of material you actually buy: how much flooring, planking, trim, siding, or board a space needs once you account for the material's face width, and how much extra to add so cuts and bad pieces do not send you back to the store. If you are instead booking an LTL load and need trailer linear feet from pallet dimensions, use the Freight Linear Feet Calculator, which is built for that shipping intent.
How to get linear feet right the first time
Linear feet trip people up because the same number means different things on a floor, on a fence line, and in a lumber aisle. Run these checks before you trust the result, then read the section that matches your job.
Linear feet measure a single straight run. If your figure really describes a surface, you want square feet, and the two never convert without a width to bridge them.
Any measurement taken in inches becomes feet when you divide by 12. A 144-inch board is 12 .
Enter the coverage or exposed face width, not the nominal cut size. A board sold as 1x6 may show closer to 5.5 once installed, and using 6 understates how much you need.
For any material you cut, add a waste factor before buying. Ten is a common starting allowance for straight runs, more for diagonal or pattern-matched work.
Example: oak flooring for a 200 square foot room
- Say you are flooring a 200 room with oak planks that show a 5-inch face.
- Square feet times 12, divided by face width, gives the running length: 200 x 12 / 5 = 480 of plank to cover the bare floor.
- Cutting at the walls and culling a few warped boards eats into that, so add a 10 waste factor: 480 x 1.10 = 528 to order.
- Buy by the box using the coverage printed on the label, and round up to the next full box rather than chasing the exact 528.
Linear feet, square feet, and where people confuse them
Linear feet count length only. Square feet count area, so they need both a length and a width. Cubic feet add height for volume. The three are not interchangeable, and mixing them is the most common ordering mistake. A 12-by-12 room has 48 of wall around its perimeter, not 144; the 144 is square feet of floor. Materials priced by length, such as fence boards, trim, pipe, and rolled goods, sell by the linear foot because length drives the cost. Rooms and lots get quoted in square feet.
Square feet to linear feet by face width
When you know the area to cover but buy material by the running foot, divide the area by the exposed face width. Multiply square feet by 12, then divide by face width in inches. A wider board covers more surface per foot, so the linear-foot count drops; a narrow strip covers less, so the count climbs fast. Use the exposed or coverage width, not the nominal cut size. A board sold as 1x6 may show closer to 5.5 once installed, and using 6 understates how much you need. This page is for buying material by the running foot; if you instead need trailer linear feet from pallet counts and dimensions for an LTL shipment, use the Freight Linear Feet Calculator, which is built for that freight intent.
Add a waste factor before you order
The raw conversion tells you the bare length to cover the surface. It does not include the pieces you cut short, the warped boards you set aside, or the offcuts a repeating pattern creates. Add a waste factor as a percentage on top of the linear feet: roughly 10 for straight runs, more for diagonal layouts, herringbone, or busy grain matching. If your area figure already includes waste, set the waste factor to 0 so you do not pad it twice.
Where the numbers go wrong
Three errors wreck linear-foot math. Entering a length in the field that expects the area to cover produces a number that means nothing. Using the nominal board size instead of the exposed face width, or mixing feet and inches, distorts the running length. Skipping the waste factor on cut material leaves you short before the job is finished.
Frequently asked questions
How do you calculate linear feet?
A linear foot is the same as a regular foot: it measures straight-line length only. Measure each piece in feet, convert any inches by dividing by 12, then add the lengths together. A 24-inch piece is 2 , and a 7-foot wall section is 7 .
What is the difference between linear feet and square feet?
Linear feet measure length along a straight line, while square feet measure area and need both a length and a width. You cannot convert square feet into linear feet without the material's face width: divide the area by that width to get the running length. With no width to divide by, the conversion has no answer.
How many linear feet are in a 12 by 12 room?
A 12-by-12-foot room has 48 of wall around its perimeter, found by adding the four sides: 12 + 12 + 12 + 12. That is length, not area. The same room holds 144 of floor, which is a separate measurement and not interchangeable with the linear-foot total.
How do I convert square feet to linear feet for flooring?
Use this when you know the area to cover but order material by the running foot. Multiply the area by 12, then divide by the material's exposed face width in inches. A 200 room with 5-inch planks needs 200 x 12 / 5 = 480 before you add any waste allowance.