Garden Calculators
Material calculators for garden and outdoor projects. Each calculator provides multi-material output, waste factor adjustments, and a downloadable PDF material list.
Paving & Hardscape
Paving Slab Calculator & Sub-BasePaving slabs, MOT Type 1 sub-base, sharp sand bedding, and jointing compound for patios, paths, and driveways with 10mm joints per BS 7533-4.Artificial Grass Calculator & InfillArtificial grass, joining adhesive, kiln-dried sand infill, weed membrane, and joining tape for any lawn shape with seam-by-roll-width planning.Pond Liner Calculator with OverlapEPDM or butyl pond liner and underlay sizes for rectangular, kidney-shaped, or irregular ponds. Includes depth allowance and 0.3m edge overlap.
Lawn & Ground Cover
Mulch Calculator with Depth GuideMulch volume and weight from bed area and depth for bark (300 kg/m³), wood chip, decorative gravel, and rubber, with bulk bag count per RHS guidance.Topsoil Calculator with Depth GuideTopsoil volume in m³ or litres and weight in tonnes for delivery, plus bulk bag count from area and depth. Topsoil grade per BS 3882:2015.
Planting
Raised Bed Soil Calculator & MixTopsoil, compost, and perlite for raised beds in a 60:30:10 mix ratio. Supports rectangular, L-shaped, and U-shaped beds with custom ratio override.Lawn Seed Calculator & CoverageGrass seed quantity from lawn area and seed rate. New lawn at 35 g/m², overseeding at 20 g/m², and patch repair modes with RHS-sourced rates.Lawn Turf Calculator & Roll CountLawn turf rolls for any garden area at standard 1 × 0.61m UK roll size with 5% cutting waste. Includes per-roll coverage summary per TGA guidance.Plant Spacing Calculator & LayoutPlant quantities for grid or staggered layouts from 100mm to 600mm spacing. Ground cover, border perennials, and mass planting per RHS spacing.Hedge Planting Calculator & SpacingHedge plant quantities from row length and species spacing. Single or double row planting for dense hedges, sized per RHS spacing guidelines.
Looking for interior projects?
Interior Calculators