How to Use Our Linear Feet Calculator (Step-by-Step)
Our tool is designed to be the most comprehensive linear foot calculator online. Whether you're framing a house, laying hardwood floors, or estimating moving truck space, accuracy is paramount. Here is how to use the different modules:
- Sum Lengths Mode: Use this if you have multiple pieces of material (like PVC pipes, baseboards, or 2x4s). Enter the length of each piece in feet and inches, specify the quantity, and click calculate. The tool will sum everything up into total linear feet.
- Sq Ft to Linear Mode: Ideal for decking, siding, and flooring. Enter your total square footage and the exposed width of your board in inches. We recommend adding a 10% waste factor to account for cuts and errors.
- Board to Linear Mode: Perfect for bulk lumber purchasing. If a sawmill quotes you in Board Feet (BF), input the BF along with the nominal thickness and width of the lumber to find out exactly how long the pile of wood is.
Understanding Linear Footage: The Definitive Guide
What is a Linear Foot?
A linear foot (often abbreviated as LF or lin ft) is a one-dimensional measurement of length that equals exactly 12 inches. Unlike square feet (which measure area) or cubic feet (which measure volume), linear footage only concerns itself with a straight line. When you buy material "by the linear foot," you are paying for the length, regardless of how wide or thick the material is.
Linear Foot to Inches Conversion
Converting between these two units is foundational in construction. To calculate linear feet to inches, multiply your linear footage by 12. Conversely, to convert inches to linear feet, divide the total inches by 12.
- Example: You have a baseboard that is 144 inches long. 144 ÷ 12 = 12 linear feet.
Crucial Conversions for Construction
Linear Feet to Square Feet Calculator Methodology
You cannot directly convert linear feet to square feet without knowing a second dimension: the width of the material. The formula is:
Linear Feet = (Square Feet × 12) ÷ Board Width in Inches
For example, if you are installing a hardwood floor over a 200 square foot room, and your floorboards are 4 inches wide:
(200 sq ft × 12) = 2,400.
2,400 ÷ 4 inches = 600 Linear Feet of flooring required.
Board Feet to Linear Feet Calculator
Board feet is a measurement of volume used exclusively in the North American lumber industry. One board foot is equivalent to a piece of wood 12 inches wide, 1 foot long, and 1 inch thick (144 cubic inches). To convert board feet to linear feet, use this formula:
Linear Feet = (Board Feet × 12) ÷ (Nominal Thickness × Nominal Width)
Project Specific Calculations
Linear Feet Calculator for Lumber & Decking
When planning a deck, your joists, fascia, and actual decking boards are all calculated differently. Decking boards are typically measured using our "Sq Ft to Linear" tab. If you have a 12x12 deck (144 sq ft) and are using standard 5.5-inch wide decking boards, you will need approximately 314 linear feet of decking. Always factor in a 10% to 15% waste margin for end-cuts.
How to Calculate Linear Feet for Moving
In the freight and moving industry, "linear feet" refers to the space your cargo takes up along the length of the trailer, regardless of height or weight (assuming it fits standard dimensions). If you have pallets that are 48 inches (4 feet) long, and you load them side-by-side, one row takes up 4 linear feet of the truck.
Standard Lumber Dimensions & Benchmarks
Use this reference table for common nominal vs. actual lumber sizes when calculating your linear footage.
| Nominal Size | Actual Size (Inches) | Linear Ft per Board Ft |
|---|---|---|
| 1x4 | 3/4" x 3-1/2" | 3.0 LF |
| 1x6 | 3/4" x 5-1/2" | 2.0 LF |
| 2x4 | 1-1/2" x 3-1/2" | 1.5 LF |
| 2x6 | 1-1/2" x 5-1/2" | 1.0 LF |
| 2x8 | 1-1/2" x 7-1/4" | 0.75 LF |
Frequently Asked Questions
What is a linear foot?
A linear foot is a straight-line measurement of 12 inches. It measures length only, ignoring width and depth.
How do you calculate linear feet to square feet?
You need the width of the material. Multiply the linear feet by the width in feet to get the square footage.
How many inches are in a linear foot?
There are exactly 12 inches in one linear foot.
Is a linear foot the same as a regular foot?
Yes, mathematically they are identical (both are 12 inches). The term "linear" is just added in construction and freight to emphasize that only length is being measured.
How do I calculate linear footage for kitchen cabinets?
Measure the length of the walls where cabinets will be installed along the floor line in inches, then divide by 12. Do not account for the height or depth of the cabinets.
Why do I need a waste factor?
When cutting materials to fit a space, offcuts are often unusable. A 10% waste factor ensures you don't run out of material mid-project.