Garden Soil Calculators

Free, no-nonsense calculators for home gardeners: work out exactly how much soil, compost or potting mix to buy for raised beds, containers and lawns — in cubic feet, cubic yards, quarts and litres — so you never overspend or come up short. Every formula is simple geometry, cited to a university extension or the Square Foot Gardening Foundation, and works in imperial or metric.

Compost Calculator

Estimate how much compost you need to top-dress a lawn, amend beds or start new ones — volume in cubic feet, cubic yards and litres, plus bags or bulk yards.
Mel's Mix Calculator

Mix Mel's Mix for Square Foot Gardening: enter your raised bed size for the total volume plus equal thirds of compost, peat moss and vermiculite by volume.
Potting Soil Calculator

Work out how much potting soil your pots and containers need — total mix in quarts, litres and cubic feet, plus how many bags to buy. Inches or centimetres.
Raised Bed Soil Calculator

Find how much soil to fill your raised garden beds: total volume in cubic feet, cubic yards and litres, plus how many bags to buy. Imperial or metric.
Topsoil Calculator

Estimate topsoil for a new lawn, leveling or filling garden beds — volume in cubic yards and cubic feet, a weight estimate, and bags versus bulk delivery.