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MakeCalcs

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 RHS-guided depths and bag count.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 seed-producer rates.Lawn Turf Calculator & Roll CountLawn turf rolls for any garden area at the standard 1m² UK roll size (610 × 1640mm) with 5% cutting waste. Includes per-roll coverage summary.Plant Spacing CalculatorPlant spacing by bed size: how many plants you need in square or triangular grids, with RHS bedding-plant spacings and plants-per-m² density.Hedge Planting Calculator & SpacingHedge plant quantities from row length and species spacing. Single or double row planting for dense hedges, sized to UK nursery spacings.

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Interior Calculators