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 →Practical UK garden calculators
Plan the project. Show the maths. Buy with fewer guesses.
Gardeners Toolkit helps you turn real measurements into useful quantities for lawns, soil, compost, gravel, paving, planting, ponds and watering. Assumptions stay visible, supplier figures stay editable, and the next useful step is never far away.
Built around the project24 working calculators, 15 supporting guides and clear routes between them.
Measurements first
Supplier inputs editable
Formula assumptions visible
Planning estimates, not fake precision
Start with your project
Choose the job before choosing the calculator
The site is organised around the sequence people actually follow: measure the space, choose the relevant material or layout, then translate the result into products or next steps.
Measure my gardenArea, shapes, exclusions and the measurement references that feed every quantity calculation.Lawn & turfPlan a new lawn or improve an existing one with turf, seed, topdressing and feed tools.Soil, compost & mulchChoose the right volume calculator for topsoil, compost, mulch, bark and growing media.Raised beds & containersFill beds and pots by internal volume, then move into compost and planting.Gravel, paving & landscapingMove from area to gravel, slabs, sub-base, membrane, edging and sleeper quantities.Planting, hedges & treesUse spacing geometry for beds, then switch to dedicated hedge and tree planning.PondsKeep pond water volume separate from liner-sheet sizing and maximum-depth measurements.Watering & rainwaterCatch rainfall, compare storage with demand and convert irrigation flow into runtime.
High-use calculators
Fast routes to the quantities gardeners most often need
Each tool exposes the inputs that can vary instead of hiding them behind a fixed generic assumption.
Free calculator
Topsoil Calculator
Calculate topsoil volume from area and depth, then match the result to the supplier bag or bulk specification.
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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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Gravel Calculator
Estimate gravel volume, approximate weight and bags from area, depth and editable density.
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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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Raised Bed Soil Calculator
Calculate the growing-medium volume needed inside a raised bed, including existing fill where relevant.
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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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Plant Spacing Calculator
Calculate bed planting density and approximate quantities for square, row and staggered layouts.
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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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Lawn Topdressing Calculator
Calculate a shallow lawn dressing in litres, cubic metres and bags without confusing it with deeper topsoil work.
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Pond Volume Calculator
Estimate pond water capacity from shape and average depth in litres, cubic metres and UK imperial gallons.
Open calculator →Project journeys
One measurement can feed several useful decisions
The strongest route is rarely a single calculator. These short journeys keep different quantities separate while letting you reuse the measurement work.
New lawn
Measure once, then reuse that area for the materials and products that follow.
Gravel area
Keep the ground area, aggregate depth, membrane layout and edge length as separate quantities.
Patio
Start with area, then separate slab count, waste allowance and the layers underneath.
Raised bed
Plan the internal fill volume before deciding compost quantities and plant layout.
Pond
Average depth drives water capacity; maximum depth drives the liner-sheet estimate.
Rainwater & watering
Estimate rainfall yield and storage first, then compare it with garden water demand and system flow.
Why the site is built this way
Useful calculations need context as well as a number
A topsoil calculator should not silently assume every bulk bag is the same. A lawn-feed calculator should not invent a fertiliser rate. A pond-volume calculator should not use maximum depth as though the whole pond were that deep. Gardeners Toolkit separates the geometry from the project decision and makes the variable part visible.
For the underlying formulas, rounding policy, supplier-data approach and approximation rules, read How our garden calculators work.