Free Calculators & Planners
Free interactive tools to help you plan your next garden or home project in the UK. Filter by category or by what the calculator works out — each filter combination has its own page you can bookmark or share directly.
Showing 12 of 12 calculators & planners
Garden Shed Size Calculator
Work out the right shed size for what you need to store, and how much space it will take up in your garden.
Lawn Seed Calculator
Calculate how much grass seed you need based on your lawn area and whether you are overseeding or starting from bare soil.
Greenhouse Heating Calculator
Estimate the heater wattage you need to keep your greenhouse frost-free through a UK winter.
Garden Zone Planner
Split your garden into lawn, patio, planting and storage zones and see how much space each one takes up.
Patio Size & Paving Calculator
Work out how many paving slabs you need for your patio and get a rough materials cost.
Fence Panel Calculator
Calculate how many fence panels, posts and bags of postcrete you need for your garden boundary.
Soil & Compost Calculator
Work out how much topsoil or compost you need to fill a raised bed or border.
Mulch Calculator
Calculate how much mulch you need to cover a border or bed at the right depth.
Decking Cost Calculator
Estimate the cost of decking your garden based on area and decking material.
Pond Volume Calculator
Calculate your pond volume in litres to help you choose the right pump and stock fish safely.
Garden Hose Finder
Answer a few quick questions and we’ll recommend the right garden hose for you.
Radiator BTU Calculator
Work out the BTU output you need to heat a room properly based on its size and type.