Free calculator
Garden Area Calculator
Measure lawns, beds and awkward garden shapes in square metres before moving into a material or planting calculator.
Open calculator →24 free UK garden calculators
Choose the calculator by the job you are doing
Measure an area, calculate a layer, count whole products or plan a spacing layout. The directory groups tools by project so you do not have to guess which formula applies.
Measure & plan
Start here when the most important unknown is the size of the space itself.
Lawn & turf
New lawns and existing lawns use the same square metres in very different ways: rolls, seed rate, feed rate and shallow topdressing.
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Turf Calculator
Work out turf rolls from lawn area, supplier roll size and an explicit cutting allowance.
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Grass Seed Calculator
Calculate grass seed for a new lawn, overseeding or patching from the rate on your seed product.
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Lawn Feed Calculator
Turn a product-label application rate into kilograms, pack count or theoretical pack coverage.
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Lawn Topdressing Calculator
Calculate a shallow lawn dressing in litres, cubic metres and bags without confusing it with deeper topsoil work.
Open calculator →Soil, compost & growing media
Choose the tool by what the material is doing: filling volume, spreading a layer, filling a container or topping a surface.
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Topsoil Calculator
Calculate topsoil volume from area and depth, then match the result to the supplier bag or bulk specification.
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Compost Calculator
Estimate compost spread over beds and borders using the area, chosen depth and actual bag size.
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Pot & Container Compost Calculator
Calculate compost for round, tapered and rectangular pots using internal dimensions.
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Mulch Calculator
Calculate organic mulch volume for beds and borders from measured area and chosen depth.
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Bark Calculator
Plan bark chippings or woodchip by volume, bags and an optional existing-layer top-up.
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Raised Bed Soil Calculator
Calculate the growing-medium volume needed inside a raised bed, including existing fill where relevant.
Open calculator →Landscaping
Keep area, depth, linear edges, sheet layout and whole-unit purchasing separate so one assumption does not contaminate the next.
Free calculator
Gravel Calculator
Estimate gravel volume, approximate weight and bags from area, depth and editable density.
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Paving Slab Calculator
Work out a slab minimum and a separate order quantity using the slab dimensions and your chosen wastage allowance.
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Patio Materials Calculator
Estimate paving, compacted sub-base, bedding and optional simple jointing quantities for a patio build-up.
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Weed Membrane Calculator
Calculate membrane strips and whole rolls from roll dimensions, overlap and layout orientation.
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Garden Edging Calculator
Calculate linear edging for beds, circles, paths, gaps and multiple runs, then convert to pieces or rolls.
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Garden Sleeper Calculator
Estimate whole sleepers for straight runs, courses and rectangular raised-bed frames, including practical side-by-side counts.
Open calculator →Planting
Beds, hedges and trees use different geometries. Pick the layout that matches the project rather than a generic plant-count formula.
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Plant Spacing Calculator
Calculate bed planting density and approximate quantities for square, row and staggered layouts.
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Hedge Plant Calculator
Estimate plants for a measured hedge run with transparent single-row and staggered double-row logic.
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Tree Spacing Calculator
Calculate tree density per hectare or acre and plan larger rectangular or staggered layouts from user-selected spacing.
Open calculator →Water & ponds
Use water-volume tools for capacity and demand, and separate material-sizing tools for the physical liner or storage system.
Free calculator
Pond Volume Calculator
Estimate pond water capacity from shape and average depth in litres, cubic metres and UK imperial gallons.
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Pond Liner Calculator
Estimate liner length, width and area from maximum dimensions, maximum depth and an editable edge allowance.
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Water Butt Calculator
Compare roof rainfall yield, storage, fill rainfall and garden watering demand without treating annual yield as tank size.
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Garden Irrigation Calculator
Calculate watering litres, runtime, delivered volume and nominal drip-emitter flow from user-entered rates.
Open calculator →Choosing the right tool
Similar-looking jobs can need very different calculations
These distinctions keep the site useful and prevent a single generic calculator from pretending to solve every garden problem.
Topsoil or lawn topdressing?
Use Topsoil Calculator for a meaningful soil layer or finished level. Use Lawn Topdressing Calculator for a shallow application measured in millimetres over existing turf.
Mulch or bark?
Mulch Calculator owns general organic surface mulching. Bark Calculator is tuned to bark chippings, woodchip, bag volume and topping up an existing bark layer.
Paving slabs or the whole patio?
Paving Slab Calculator answers “how many slabs?”. Patio Materials Calculator adds the sub-base and bedding layers.
Pond volume or pond liner?
Pond Volume Calculator uses average depth for water capacity. Pond Liner Calculator uses maximum depth to size the sheet.
Plant, hedge or tree spacing?
Plant Spacing handles beds and grids, Hedge Plant handles linear runs, and Tree Spacing handles larger plots, hectares and acres.
Garden area or garden edging?
Garden Area gives square metres. Garden Edging gives a linear boundary and whole pieces or rolls.
Two useful references
Keep the unit conversions close
Use the measurement reference for metres, feet, square metres, hectares and acres. Use the material-depth reference when the key relationship is area × depth = volume.