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Mulching Estimator
Estimate how much mulch (straw, wood chips, bark or plastic film) you need to cover a given area at a target thickness, and the resulting weight and cost.
Results
How to Use This Calculator
Enter the area in m², desired mulch thickness in cm, select mulch type (straw, wood chips, bark or plastic) and enter local price per m³. Click Calculate to see volume, weight and cost.
About This Tool
Volume = area × thickness. Bulk densities are typical: straw 150 kg/m³, wood chips 250 kg/m³, bark/shredded 500 kg/m³. Plastic film has no meaningful volume (it is a sheet) and weight is shown only for organic mulches.
Applicability: Designed for temperate and subtropical soils, applicable to farming systems across North America and Europe.
How the Calculation Works
Volume (m³) = Area (m²) × Depth (m). Cubic yards = Volume × 1.308. Weight (t) = Volume × Density (kg/m³) ÷ 1000. Cost = Volume × Unit price.
Real-World Example
100 m² at 5 cm (0.05 m) wood chips: volume = 100 × 0.05 = 5 m³. Weight = 5 × 250 ÷ 1000 = 1.25 t. At $40/m³, cost = $200.
Common Mistakes & Tips
Common mistakes: ordering by weight instead of volume (mulch is sold by volume), not accounting for settling (organic mulches settle by 30–50% over 6 months), applying too thick (over 15 cm can smother plants), and forgetting to account for pathways or non-planted area.
Reviewed by Agricalc Editorial Team — Agricultural engineers and agronomists with 10+ years of field experience. Our team verifies every calculator formula against peer-reviewed extension publications. For site-specific advice, consult your local agronomist.
References
Frequently Asked Questions
How thick should mulch be?
Most organic mulches are applied 5–10 cm (2–4 inches) deep. Thinner layers do not suppress weeds; thicker than 15 cm can block water and oxygen. For vegetable gardens, 5 cm is typical; for landscape beds, 7–10 cm is standard.
What is the best mulch for vegetable gardens?
Straw, hay and chopped leaves are cheap, light and easy to incorporate. Wood chips last longer but can tie up nitrogen as they decompose near the soil surface. Plastic film warms soil early but does not improve soil biology. Choose based on crop, climate and budget.
How much does a cubic yard of mulch weigh?
Wood chips: ~400–500 kg/yd³ (600–800 lb). Bark: ~500–700 kg/yd³. Straw: ~150–250 kg/yd³. Bulk density varies with moisture and settling — wet mulch can weigh twice as much as dry.
Does mulch really save water?
Yes. A 5 cm organic mulch reduces soil evaporation by 50–70% and keeps soil 5–10 °C cooler in summer. It also suppresses weeds (reduces weed seed germination by ~80%), improving water availability for the crop.
How often do I need to reapply mulch?
Straw or hay breaks down in 1 season and needs annual reapplication. Wood chips last 2–3 years. Bark nuggets last 3–5 years. Top up as it decomposes; do not pile mulch against plant stems (it causes rot and collar pests).
