Garden Planning Calculators

A well-planned garden project starts long before you pick up a spade. Knowing exactly how much material you need -- whether that is topsoil for a border, liner for a pond, or seed for a new lawn -- prevents waste, keeps costs under control, and means you are not making emergency runs to the garden centre halfway through a weekend project.

Lawn projects are among the most common starting points for garden transformations. The lawn seed calculator estimates how much seed you need for a new lawn or an overseeding job, factoring in the recommended sowing rate for your seed type and the dimensions of your plot. For instant results, the topsoil calculator works out how many bulk bags or tonnes you need to raise or level an area to a target depth, using standard topsoil density figures.

Raised beds have surged in popularity for both vegetable growing and ornamental planting. The raised bed soil calculator estimates the volume of growing medium required based on your bed dimensions, and accounts for the common practice of filling the bottom third with a cheaper bulk material. The compost bin calculator then helps you size a composting system to match the organic waste output of your household and garden.

Water features add a focal point to any garden, but getting the sizing wrong can be costly. The pond volume calculator works out how many litres your planned pond holds -- essential for choosing the right pump, filter, and fish stocking levels. The pond liner calculator then determines the sheet size you need, adding the recommended overlap allowance for your pond's depth and shape.

Structures and hard landscaping form the backbone of a garden layout. The shed base calculator estimates the amount of aggregate and membrane needed for a solid foundation. The decking calculator covers both timber and composite boards, giving you board counts, joist quantities, and fixing requirements for your deck area. The fence calculator estimates panels, posts, gravel boards, and postcrete for any boundary run. Once your fence is up, the fence paint calculator tells you how many litres of treatment you need based on panel count and whether you are coating one or both sides.

Patio paving brings together slabs, jointing compound, and sub-base aggregate. Our calculator accounts for standard UK slab sizes and includes a cutting waste allowance that varies with layout complexity. For glasshouse growers, the greenhouse heating calculator estimates the wattage needed to maintain a target temperature during winter months, based on your greenhouse dimensions and glazing type.

Together, these tools let you map out an entire garden project from boundary to centre, ordering materials with confidence and keeping your budget on track.