Linear to Square Feet Converter

Instantly convert linear footage to square footage — and vice versa. Enter your measurements below, choose the material width, and get accurate area results for flooring, decking, trim, landscaping, and construction projects.

Common:
0 sq ft

How does this size compare?

0 parking spaces
1 parking space = 162 sq ft
0 king beds
1 king bed = 42 sq ft
0 sheets of plywood
1 sheet (4×8) = 32 sq ft

Choose materials for your area

4′ × 8′ Plywood Sheets
—
32 sq ft per sheet
5.5″ Deck Boards
—
Coverage = 0.458 sq ft / linear ft
7″ Laminate Planks
—
Each plank covers ~2.33 sq ft (4′ long)
Waste Allowance Estimator
Exact: 0 sq ft +10%: 0 +15%: 0

📏 Cut Planner — Standard Board Lengths

Your total linear footage is 0 linear feet. Here's how many standard boards you'll need.

Standard 8′ boards
—
pieces needed
Standard 12′ boards
—
pieces needed
Standard 16′ boards
—
pieces needed
📐 Total linear feet entered: 0 linear ft
8′ 12′ 16′

How to Use This Converter

  1. 1
    Choose Your Conversion Direction
    Select Linear → Square Feet if you know a material's length in linear feet and want the total area. Choose Square Feet → Linear if you know the area to cover and need to buy material by the linear foot.
  2. 2
    Enter Your Measurement
    Type in the length (linear feet) or area (square feet) depending on your selected mode. Use decimal values for partial measurements — for example, 12.5 for 12½ feet.
  3. 3
    Set the Material Width — Carefully!
    Enter the width and choose Inches or Feet from the dropdown. This is the most common mistake — entering 6 with "Feet" selected when you meant 6 inches (0.5 ft) will give a wildly incorrect result. Use the preset chips for standard material sizes.
  4. 4
    Calculate & Copy
    Click Calculate or simply type — results update live as you enter values. Use the Copy button to save the result to your clipboard for estimates, invoices, or material orders.
⚠️ Watch Your Width Units: The #1 mistake in linear-to-square conversions is forgetting to match width units. If your material width is in inches, select "Inches" — the converter automatically divides by 12 before multiplying. Entering a 6-inch board width with "Feet" selected would calculate 6× your length instead of 0.5×, overstating the area by 12 times. Always double-check the unit dropdown next to the width field.
Privacy First: No data is sent to our servers. All calculations are performed locally in your browser.
Calculated based on the fundamental area formula: Area = Length × Width (mathematical law). For width in inches, the conversion factor is Width ÷ 12 (1 foot = 12 inches, per U.S. customary units). Best for rectangular surfaces — irregular shapes should be divided into rectangles and summed. Always add 10–15% waste allowance for cuts, pattern matching, and installation gaps in real-world projects.

Convert Linear Feet to Square Feet – The Only Guide You’ll Need

Whether you’re estimating deck boards, ordering flooring, or calculating trim, the linear‑to‑square‑feet conversion is essential. Use our free online converter above, or learn the formula and pro tips below to never miscalculate again.

⸻ The Core Formula

Length (L) Width (W) Area = L × W
Square Feet = Linear Feet × Width (ft)

If the width is in inches, divide it by 12 first (1 foot = 12 inches). For example, a 6‑inch‑wide board has a width of 0.5 feet. This fundamental area law is derived from the International System of Units (NIST).

How to Use the Linear to Square Feet Converter

  1. Pick your direction – Choose “Linear → Square Feet” if you know the length of material, or “Square Feet → Linear” if you know the area to cover.
  2. Enter your main value – For linear feet, type the total length. For square feet, enter the area you need to cover.
  3. Set the material width accurately – This step causes 90% of errors. Make sure the unit dropdown (inches or feet) matches your measurement. Pro tip: use the preset chips for standard lumber sizes.
  4. Get instant results – The calculation updates live. Copy the result for your ordering or planning.
Pro Tip – Don’t forget the waste factor!
The converter gives you exact mathematical area. In real‑world projects, always add 10–15% extra material for cuts, pattern matching, and installation gaps. For irregular shapes, break the space into rectangles, calculate each, and sum them up.

Common Width References

1×4 lumber3.5 in0.292 ft
1×6 deck board5.5 in0.458 ft
4×8 plywood48 in4 ft
Laminate plank7 in0.583 ft

Quick Conversion Examples

100 linear ft × 6 in50 sq ft
50 linear ft × 12 in50 sq ft
200 linear ft × 5.5 in91.7 sq ft
300 linear ft × 4 ft1,200 sq ft

Frequently Asked Questions

What’s the difference between linear feet and square feet?
Linear feet measure length only (one dimension), while square feet measure area (length × width). When you buy a board, its length in linear feet tells you how long it is, but you need the width to know how much floor it will cover.
How do I convert linear feet to square feet?
Multiply the total linear feet by the width of the material (in feet). If the width is in inches, divide it by 12 first. For example: 100 linear feet of a 6‑inch‑wide board = 100 × (6/12) = 50 square feet.
Why does material width matter so much?
The width determines how much area one linear foot of material actually covers. A 12‑inch‑wide board covers twice the area of a 6‑inch‑wide board for the same linear length. Always check nominal vs. actual lumber sizes – a 1×6 board is actually 5.5 inches wide.
Do I need to add extra for waste?
Yes. The converter’s result is the exact mathematical area. For real projects, add 10–15% for cuts, pattern offsets, and defects. For complicated layouts or angled cuts, aim closer to 20% waste.
Can this converter be used for irregular shapes?
It works best for rectangular surfaces. For L‑shaped rooms or custom cuts, break the area into smaller rectangles, calculate each piece individually, and add them together. For circular or curved spaces, use a dedicated area calculator.

For official measurement standards, refer to the NIST Guide to SI Units. When planning flooring, the Family Handyman square‑footage guide offers excellent real‑world tips. Always check local building codes for material requirements.