Gardening Calculators

8 free calculators · Updated for 2026/27

Garden jobs are mostly a question of area and volume, and guessing either means a second trip to the garden centre or a stack of unused bags. Gardening calculators turn lawn areas, bed sizes, patio dimensions and pond shapes into quantities and costs, so a weekend of seeding, landscaping or building a raised bed can be priced and ordered in one go.

Seed for a new lawn, an overseeding job or a patch repair is measured by the Lawn Seed Calculator, which gives bag counts with costs. The Raised Bed Soil Calculator works out soil, bags and sleepers for a bed of a given size, the Patio Paving Calculator counts slabs along with the jointing sand, and the Pond Volume Calculator gives volume in litres plus pump size and liner dimensions. The Fence Paint Calculator sizes paint or stain from panels, height and coats.