Garden Project Calculator
Estimate soil & mulch volume, plant spacing, and irrigation water use — in metric or imperial.
Bed dimensions
Typical mulch depth: 5–10 cm (2–4 in). Topsoil beds: 15–30 cm (6–12 in).
Material
Average bulk densities — actual weight varies with moisture and compaction. Check with your supplier for exact figures.
Bag size (optional)
Results
Volume
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Weight
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Bags needed
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Order a little extra (5–10%) to allow for settling, uneven ground, and spillage during transport.
Planting area
Planting pattern
Triangular (quincunx) spacing packs roughly 15% more plants into the same area than a square grid, with more even canopy coverage.
Results
Plants needed
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Bed area
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Pattern comparison
Square grid
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plants
Triangular
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plants
Illustrative patterns above are not to scale — they show how each layout is arranged.
Watering zones
Weekly water use by zone
Total per week
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Daily average
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Monthly estimate
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Reduce runtime on your highest-use zone, or switch spray heads to drip emitters, to cut water use without watering less often.
All figures are planning estimates. Verify material density and irrigation flow rates with your supplier or equipment manual for precise ordering.