Landscaping & Garden Calculators

Material calculators for UK gardens and landscaping — topsoil and compost, turf, mulch and bark, garden decking and soakaway drainage. Each tool accounts for settling, cutting wastage and recommended depths so you order the right volume first time.

Landscaping
Topsoil & Compost
Soil or compost volume for raised beds, borders and lawn preparation.
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Landscaping
Lawn Turf Calculator
Turf rolls for any lawn shape, with 5–10% cutting wastage included.
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Landscaping
Mulch & Bark Calculator
Woodchip or bark volume to achieve effective weed-suppression depth.
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Landscaping
Garden Decking Calculator
Decking-board count and linear metres for any garden deck area.
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Landscaping
Soakaway Design Calculator
Plastic-crate counts or rubble volume for surface-water drainage.
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How these calculators work

Garden materials settle, shrink and get cut to fit, and that's where estimates go wrong. The topsoil calculator applies BS 3882 rooting depths and a settling allowance (loose soil consolidates 10–25% depending on type), turf includes 5–10% cutting wastage for awkward shapes, and mulch is worked to the depth that actually suppresses weeds. The soakaway tool sizes crate or rubble volume using the BRE Digest 365 method, the same approach a drainage engineer would use.