How Much Do You Need? Free Landscape Fabric Calculator | DOTDAY

Use the landscape fabric calculator, skip the manual math

The right amount of landscape fabric is the difference between a project that holds for a decade and one that fails by spring. The fastest path to the right answer is the DOTDAY Landscape Fabric Calculator. It asks four questions - project type, application, weed pressure, and dimensions - and returns the exact fabric type, roll size, quantity, and cost breakdown for your project. No guesswork, no calling the supplier back for a second order. Whether you're laying a gravel driveway, building garden beds, or installing a French drain, the math is the same.

How the DOTDAY calculator works: 4 steps to your spec

1. 1
   Choose your category

   Tell the calculator what you're building - weed control and landscaping, or drainage and stabilization.
2. 2
   Select your application

   Pick from garden beds, under decks, driveways, under gravel, heavy foot traffic, and more. Each maps to a different fabric spec.
3. 3
   Set your site conditions

   Choose your weed pressure: Low, Medium, High, or Extreme. Getting this wrong is the most common reason fabric fails ahead of schedule.
4. 4
   Enter your dimensions

   Input length and width. The tool computes total area and applies a 10% wastage buffer for the mandatory 6-inch overlaps and edge trimming. Use 15% for irregular or L-shaped areas.

Real-world calculation examples

A 10x10 garden bed is 100 sq ft; add the 10% buffer for 110 sq ft, and a single 3ft x 50ft roll covers it with room for clean overlaps. A woven fabric like SHIELD 3.2oz is right here so water and nutrients still reach roots. A 20x50 gravel driveway is 1,000 sq ft, or 1,100 with the buffer; that job demands XBAR 5oz dual-layer woven, and a 4ft x 300ft roll covers it in one purchase. A 1,500 sq ft backyard with drainage needs TERRA non-woven geotextile, where permeability matters more than weed-suppression weight.

Landscape fabric coverage chart: roll sizes at a glance

Woven vs non-woven: match construction to the job

Getting the square footage right is only half the equation. SHIELD 3.2oz is woven polypropylene, ideal for weed suppression in beds, under mulch, and under decks. XBAR 5oz is a dual-layer woven, a woven top over a non-woven backing, engineered for driveways, under gravel, and high-traffic ground. TERRA non-woven geotextile is bonded-fiber construction built for drainage, French drains, and soil separation where water permeability is the priority. Using the wrong construction for your application is the most expensive mistake in landscaping, and the most common.

5 calculation mistakes that waste money

1. 1
   Skipping the 10% overlap buffer

   Overlap sheets at least 6 inches. Without it, weeds find the seams within the first season.
2. 2
   Choosing roll width by price alone

   A 3ft x 400ft and a 6ft x 200ft roll both cover 1,200 sq ft, but the narrower roll creates twice the seams and overlap.
3. 3
   Using the wrong fabric construction

   Lightweight woven under gravel fails inside two years; a drainage geotextile in a garden bed suffocates plants. Match type to application.
4. 4
   Underestimating waste on irregular shapes

   L-shaped beds and areas with many obstacles generate more off-cuts. Add 15% instead of 10% for complex layouts.
5. 5
   Ignoring fabric weight for your weed pressure

   A 3.2oz fabric handles light to moderate pressure; high-traffic zones or aggressive established roots need a 5oz fabric.

Ready to get your project spec?

Getting the fabric right, the correct type, the right quantity, the optimal roll size, is what separates a project that holds for 10 years from one that needs redoing next summer. Use the landscape fabric calculator to find your match, or read the full installation guide to prep your site before the fabric goes down.

Frequently asked questions