The calculation, without hidden assumptions
Fabric purchasing is mostly an area-and-packaging problem, but overlaps, edge cuts and irregular beds mean measured area is not always order area. This calculator keeps the extra percentage visible and rounds to the actual roll dimensions you enter.
How to use this calculator
Measure the actual covered area, combining simple shapes if necessary.
Set an allowance that reflects required overlaps, cuts and bed geometry.
Enter the exact roll width/length and optional price to compare package options.
Where people use it
- •Weed-barrier beds
- •Under-stone fabric planning
- •Geotextile roll purchasing
Worked example
A 1,000 ft² project with 15% overlap/cut allowance requires 1,150 ft² of order coverage before whole-roll rounding.
What the result does not assume
- •Roll-area math does not optimize strip orientation or seam placement.
- •Use product-specific overlap and installation instructions.
Frequently asked questions
Does the allowance include overlap?+
It can. Set the percentage to cover the overlap and cutting conditions of your installation.
Why can purchased coverage exceed order area?+
Fabric is sold in whole rolls, so the final package rounding creates surplus.
Does roll coverage already include seam overlap?+
No. Use the allowance input to cover seams, cuts and irregular edges based on the exact installation instructions for the product.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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