Soil, Compost & Mulch Calculators

Which soil & mulch calculator do you need?

• Raised Bed Soil Calculator: How much soil mix fills your raised beds, split into topsoil, compost and aeration.
• Topsoil Calculator: How much topsoil to order for a lawn, bed or level-up, by volume, weight or bag.
• Mulch Calculator: Bags or bulk mulch for your beds and borders at the depth you choose.
• Compost Calculator: Compost for top-dressing, new beds or lawns, in bags or bulk.
• Potting Soil Calculator: Potting soil for several container sizes at once, with bags to buy.
• Soil Amendment Calculator: How thick a layer of compost or other amendment to spread to reach a target mix.
• Garden Volume Calculator: The volume of any bed, planter or hole in litres, cubic feet, cubic yards and cubic metres.
• Soil Calculator: Volume, weight, bags and truck loads for soil, compost, sand or gravel.
• Topsoil Weight to Cubic Feet Calculator: Convert a bag of topsoil, soil or mulch between pounds, kilograms, cubic feet and litres.
• Compost C:N Ratio Calculator: The carbon-to-nitrogen ratio of your compost mix, and how many browns to add for 30:1.

Every tool works in metric or imperial units, shows its formula and a worked example, and lets you edit the assumptions that vary from garden to garden. Results stay on your device; nothing you enter is stored.