400 sq ft · 100 sq ft rolls · 10%
Input
400 sq ft · 100 sq ft/rollOutput
5 rolls440 sq ft needed ÷ 100 = 4.4 → 5 rolls.
Landscape fabric rolls are **bed area ÷ roll coverage**, rounded up, plus overlap buffer.
**Formula:**
Sq ft needed = Bed area × (1 + buffer% / 100)
Rolls = ceil(Sq ft needed ÷ Sq ft per roll)
**Example — 400 sq ft bed, 100 sq ft rolls, 10% buffer:**
400 × 1.10 = 440 sq ft
440 ÷ 100 = **5 rolls**
**Sq ft per roll:**
Multiply width × length on the label — e.g. 3 ft × 100 ft = **300 sq ft** per roll.
Overlap seams **3–6 in** and wrap fabric up bed edges — include overlap in your buffer.
The calculator treats the bed as flat area divided by roll coverage, rounded up to whole rolls. An optional buffer covers seam overlap and edge wrap.
Formula
rolls = ceil(netArea × (1 + buffer%/100) ÷ boxSqFt)Tap 20×10 ft shrub border, 400 sq ft island, or 60 ft path edge strip.
Enter length × width or total square footage of the area receiving fabric.
Multiply roll width × length from the package — e.g. 3×100 ft = 300 sq ft, 4×100 ft = 400 sq ft.
Results round up to whole rolls — buy an extra roll for large irregular beds.
Enable 10–15% for seam overlap, curves, and wrapping bed edges.
Input
400 sq ft · 100 sq ft/rollOutput
5 rolls440 sq ft needed ÷ 100 = 4.4 → 5 rolls.
Input
200 sq ft · 3×100 ft rollOutput
1 rollSingle commercial roll covers small border.
Input
180 sq ft · 150 sq ft rollsOutput
2 rolls180 sq ft with 10% buffer → 2 rolls.
Input
50 m² · 100 sq ft rollsOutput
6 rolls~538 sq ft net area with buffer.
Common real-world scenarios where this tool saves time.
400 sq ft bed, 100 sq ft rolls, 10% buffer: 5 rolls. Overlap seams 4 in and pin every 3 ft.
20×10 ft (200 sq ft) with 3×100 ft rolls (300 sq ft each): 1 roll covers with buffer to spare.
60 ft × 3 ft strip along walk — long narrow beds may need multiple strips; add 15% for curves.
Fabric on drain zone before backfill rock — pair with Retaining Wall Block Calculator.
Step-by-step chains that connect related tools for common tasks.
Fabric then mulch.
Fabric under decorative stone.
| Roll | Width | Length | Sq ft |
|---|---|---|---|
| Retail small | 3 ft | 50 ft | 150 |
| Standard | 3 ft | 100 ft | 300 |
| Commercial | 4 ft | 100 ft | 400 |
| Wide | 6 ft | 100 ft | 600 |
Always confirm dimensions on your package label.
Sq ft per roll = **width × length**. A 100 ft roll at 3 ft wide = 300 sq ft, not 100.
Overlap rows **3–6 in** at seams — weeds grow through gaps.
Remove existing weeds and smooth soil before laying fabric — fabric suppresses, it does not kill deep roots.
Curved beds waste more at cuts — use **15% buffer** instead of 10%.
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4 rolls without buffer. With 10% overlap buffer: 5 rolls (440 sq ft needed).
Multiply roll width by roll length. A 3 ft × 100 ft roll = 300 sq ft coverage.
Overlap seams 3–6 inches. Add 10% buffer for straight beds, 15% for curved beds.
Woven or non-woven landscape fabric allows water and air — plastic traps water and kills soil biology.
Yes. Install fabric on bare soil, pin seams, then spread 2–3 in mulch on top.
Yes — separate soil from drain rock backfill. Calculate wall blocks and gravel separately.
Bed dimensions are processed only in your browser — EverydayTools does not collect or store your measurements.
Roll estimates only — not landscape contracting. Confirm roll dimensions on your supplier label.
Part of Calculator Tools
More free tools for the same workflow.
Free landscape rock calculator: bed size or tree ring and depth → cubic yards, ton estimates, bags, and bulk vs bag guidance. River rock presets, round bed mode, order buffer. Runs locally in your browser.
Free mulch calculator: enter bed size or square footage and depth → cubic yards, cubic feet, liters, and bag counts. Depth presets, coverage tables, optional buffer. Imperial or metric. Runs locally in your browser.
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Reviewed on 2026-06-28.
300 sq ft · 10% overlap buffer
Multiply roll width × length from the label — e.g. 3 ft × 100 ft = 300 sq ft.