Linear Feet to Square Feet Calculator

Use this linear feet to square feet calculator to convert both directions while keeping width in view. Linear footage only becomes square footage once you know the material width, which is why this tool works best for flooring, fabric, carpet, underlayment, and other roll goods sold by length plus width.

Quick check: 100 linear ft equals 100 sq ft at 12 in wide, 200 sq ft at 24 in wide, 300 sq ft at 36 in wide, 400 sq ft at 48 in wide, and 1,200 sq ft at 12 ft wide.
Operated by: Cloudtopia Maintenance: Updated when formulas, supplier packaging, or guidance change.
How to use this page

Use this page for a fast bridge number or sanity check, then continue into the related calculators or guides below when the decision needs more than a raw conversion.

Linear footage only turns into area once the width is known. Use inches for narrower roll goods and trim-adjacent materials, or switch to feet for carpet and wide sheet goods.

Start with the linear footage you plan to buy or already have, then apply the width to see the real coverage area.

Useful for roll lengths, trim runs, and store quantities sold by length.
Width is the whole point of this conversion. Without it, linear footage is not area.
Keep the width in the exact unit your product spec uses.

Common widths

Width rule: At 36 in width, 1 linear ft = 3 sq ft and 1 sq ft = 0.3333 linear ft.
Enter a length or area plus the material width to get the live conversion. This tool is width-aware on purpose, so the answer changes as soon as the roll width changes.

Use either mode for a fast first answer, then jump to the related calculators below if you still need a full takeoff, waste allowance, or project-specific material order.
Next step

Need the full fabric takeoff?

Switch to the landscape fabric calculator when you need overlap, pins, waste, and project-ready roll planning instead of a plain width conversion.

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Compare with the rest of the converter fleet

Jump back to the converter hub if you need the supporting measurement tools that usually come before or after this roll-width conversion.

Next measurement & material steps

Fraction to Decimal Converter

Normalize fractional widths and cut-sheet numbers before you translate the material into coverage area.

Convert →

Landscape Fabric Calculator

Turn bed, path, or slope measurements into fabric coverage, overlap, anchor counts, and project-ready roll takeoffs.

Calculate →

Flooring Calculator

Turn room area into boxes, waste, and plank ordering once the width-aware area conversion is settled.

Calculate →

Carpet Calculator

Move from width-aware roll math into carpet cuts, seams, and room-ready ordering.

Calculate →
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How This Conversion Works

Linear feet describes only length. Square feet describes coverage area. The missing bridge is width, which has to be converted into feet before the math is honest.

Square Feet = Linear Feet × Width (in feet)

Linear Feet = Square Feet ÷ Width (in feet)

If your width is written in inches, convert it first or let the tool do it for you. That is especially common on landscape fabric, trim-adjacent materials, membranes, and other products that use 12-inch, 18-inch, 24-inch, 36-inch, 48-inch, or 72-inch roll widths. Wider flooring and carpet goods often jump straight to 12-foot widths.

After you have the area or required linear footage, use the fraction to decimal converter if the cut sheet mixes common fractions with decimals, the millimeters to inches converter if an imported spec needs normalizing, and a project-specific tool like the landscape fabric calculator or edging calculator when you are ready to turn the simple conversion into a real takeoff.

Quick Reference: Common Widths

These are the width checkpoints people most often use for roll goods and similar coverage materials. Start here when you need a fast answer before the full project math.

Linear feet
12 in
1 ft wide
18 in
1.5 ft wide
24 in
2 ft wide
36 in
3 ft wide
48 in
4 ft wide
72 in
6 ft wide
12 ft
carpet width
10 linear ft 10 sq ft 15 sq ft 20 sq ft 30 sq ft 40 sq ft 60 sq ft 120 sq ft
25 linear ft 25 sq ft 37.5 sq ft 50 sq ft 75 sq ft 100 sq ft 150 sq ft 300 sq ft
50 linear ft 50 sq ft 75 sq ft 100 sq ft 150 sq ft 200 sq ft 300 sq ft 600 sq ft
100 linear ft 100 sq ft 150 sq ft 200 sq ft 300 sq ft 400 sq ft 600 sq ft 1,200 sq ft

Worked Roll-Good Examples

Landscape fabric roll check

150 linear ft of 3-ft-wide fabric = 450 sq ft (50 sq yd)

This is the fast way to translate a standard 3-ft fabric roll into real coverage before you start accounting for overlap, pins, or trench anchoring.

Carpet and wide roll goods

300 sq ft at 12-ft width = 25 linear ft

When a room area is already known, the reverse mode tells you the length of 12-ft carpet or underlayment you need to order before seam and trimming decisions.

Where This Tool Helps Most

Roll goods and coverage products

Landscape fabric, underlayment, carpet, erosion-control fabric, and membrane products are often sold by the roll or by linear footage. Width is what turns that into real coverage.

Bid translation

A contractor may think in square feet while a supplier talks in 3-ft or 12-ft-wide rolls. This tool bridges the two languages before the project-specific calculator takes over.

Next-step planning

Once the coverage makes sense, move into the right takeoff page for overlap, perimeter runs, anchors, edging, or related project-specific order details.