SettingsSettings for this calculationUS
The total area to cover with fabric.
Measure the garden bed, path, or gravel area's length x width.
Fabric spent where strips lap each other so weeds cannot come up through the seam.
On a wide bed a narrow side lap is about a tenth of each strip. On a narrow border, or a long path where end laps stack up, the laps take a far bigger share of the roll, so set the figure from the strips you will actually lay there.
Landscape fabric rolls needed
2 rolls
- Area to cover (with overlap allowance)
- 473 sq ft
They open the calculator with your figures already in it
Landscape Fabric Calculator: 2 rolls — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- A standard landscape/weed barrier fabric roll covers approximately 300 sq ft, per common retail roll sizes
Inputs used
- Bed or Path Area
- 430 sq ft
- Overlap Allowance (%)
- 10
Intermediate steps
- Area to cover (with overlap allowance)
- 473 sq ft
What this calculation does not cover
- The roll count assumes every roll covers 300 sq ft (about 27.9 m²), and there is no field for the roll you are actually buying. Landscape fabric is sold in several width and length combinations, and the answer moves in direct proportion: halve the coverage of the roll and you need twice as many. Take the "area to cover" figure from the breakdown and divide it by the coverage printed on your own roll before you order.
- Overlap is a percentage uplift on the area, not a lap calculation. Roll width, lap width and the number of strips a bed takes are not inputs, so the default 10 per cent only holds where the bed is wide enough that a narrow side lap costs roughly a tenth of the sheet. On a narrow border, on anything run across the roll rather than along it, or where end laps stack up on a long run, the lap fraction rather than the bed area decides the count, and the allowance has to be raised to match.
- Nothing is added for cutting waste. Fabric worked around established shrubs, tree trunks, posts, drain covers, curved bed edges, or any bed narrower than the roll leaves offcuts that will not be used anywhere else, and the allowance here is for overlap rather than for cutting. There is also no allowance for turning the sheet up at edges or tucking it under edging restraint.
- This counts fabric only. Pins or staples, seam tape, edging, the ground preparation underneath and the mulch or gravel that goes over the top are separate quantities, and none of them are in this number.
- The result is a quantity, not a specification or a judgement that fabric is the right answer. A light non-woven and a heavy woven of the same area return the same roll count despite very different permeability, weed resistance and service life, and under mulch the organic debris that collects on top of the sheet becomes its own seed bed whatever grade you buy. The area field also stops at 2,000 m² (about 21,500 sq ft); enter more and the figure is replaced with that limit, and a job at that scale is buying contractor-width rolls this retail-roll model does not describe.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
Part of a bigger job
This trade is one line of a job takeoff. Run the whole job and every other trade comes back with it, off the same measurements.
also measuresTopsoilMulchLawn Edging
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-17 · v1.1.0
Regulatory standards & verification citations1
- A standard landscape/weed barrier fabric roll covers approximately 300 sq ft, per common retail roll sizes
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