Landscaping Square Footage Calculator — Mulch, Stone, and Garden Bed Coverage
Landscaping material quantities — mulch, decorative stone, bark chips, topsoil, compost, and rubber mulch — are all calculated from the area of the beds or zones being treated multiplied by the installation depth. The area calculation uses square footage; the volume calculation converts to cubic yards for bulk ordering. Underestimating by 20% means running out mid-job; overestimating by 20% means paying for delivery of material that sits in the driveway.
Use this calculator for garden bed area, path coverage, and any landscaping surface that requires a specific coverage material. Measure each bed or zone separately if they have different materials or depths, then sum for the total order.
Mulch Coverage Rates by Depth
Mulch depth determines both the weed suppression effectiveness and the volume needed. The recommended mulch depth is 2–3 inches. Less than 2 inches allows weed seeds to germinate through; more than 4 inches creates moisture barriers that suffocate plant roots.
- 1 cubic yard of mulch at 1" depth: covers 324 sq ft
- 1 cubic yard of mulch at 2" depth: covers 162 sq ft
- 1 cubic yard of mulch at 3" depth: covers 108 sq ft
- 1 cubic yard of mulch at 4" depth: covers 81 sq ft
- 1 bag (2 cu ft) of mulch at 2" depth: covers 12 sq ft
- 1 bag (3 cu ft) of mulch at 3" depth: covers 12 sq ft
Decorative Stone Coverage
Decorative stone (river rock, pea gravel, crushed granite) is sold by the cubic yard or the ton. Coverage depends on stone size: finer gravel packs more densely and covers more area per cubic yard than large river rock. Coverage at 2 inches depth:
- Pea gravel (3/8"): 1 cu yd covers approximately 100 sq ft at 2" depth; 1 ton ≈ 0.7 cu yd
- Crushed granite: 1 cu yd covers approximately 90 sq ft at 2" depth
- River rock (1–2"): 1 cu yd covers approximately 75–80 sq ft at 2" depth
- Large river rock (3–5"): 1 cu yd covers 50–60 sq ft at 3–4" depth
Landscaping Path Coverage
Garden paths require the same area calculation as beds. Measure path length and width. A winding path can be approximated by measuring the centreline length and multiplying by the path width. Stepping stone paths require the individual stone area calculation: count the stones, measure one stone's area, and multiply. The gap area between stepping stones requires its own mulch or gravel coverage calculation.
Related tools: lawn calculator · yard calculator · cubic yards calculator · irregular shape
Landscape Fabric and Weed Barrier Coverage
Landscape fabric is installed under mulch, gravel, and stone beds to suppress weeds while allowing water to drain. It is sold by the square foot (in rolls with widths from 3 ft to 6 ft). Measure your bed area, add 10% for overlapping at seams (minimum 6-inch overlap where two strips join) and folding up at edges. For an irregular bed with a total area of 350 sq ft: order 385 sq ft of landscape fabric. A 3 ft × 50 ft roll covers 150 sq ft — you need 3 rolls (450 sq ft) to ensure full coverage with overlaps. Pin every 18–24 inches with landscape staples. Buy 1 staple per square foot of fabric — 385 staples minimum. Landscape staples are sold in boxes of 50–100.
Erosion Control and Ground Cover Square Footage
Slopes, hillsides, and drainage channels require erosion control measures. Erosion control blankets (jute netting, coir matting, or straw wattle) are sold by the square yard or square foot. Measure the slope area — length along the slope (not horizontal distance) × width. For a slope 15 ft long (measured along the slope surface) and 30 ft wide: 450 sq ft of erosion blanket. Add 10% for overlapping at seams. Hydroseeding (sprayed seed-and-mulch slurry) for slope restoration is bid per square foot by the contractor and applied at 1,500–2,000 sq ft per application tank. Silt fence for sediment control is ordered by the linear foot, not square foot — measure the downslope perimeter that needs protection.