LEAF & LODGE GARDENING TOOLS

Compost Calculator

Estimate how much compost your garden beds, borders, lawn, or containers need. Calculate volume, bag quantities, and an optional cost estimate before you buy.

Garden beds & borders Depth presets Bags & bulk costs

Measure once, order confidently

Choose the application, set a suitable depth, and enter your area. Leave prices blank if you only need the volume.

Application

sets a sensible depth

Where is the compost going?

Depth

Custom depth Units

Lawn top dressing works best at ¼–½″ — deeper than that risks smothering the grass.

Area

How do you want to enter it?

Length Width Units

Total area (square feet) Not sure? Pace it out — a normal stride is about 2.5 ft

Buying it

optional

Leave prices blank to skip cost estimates. For lawns, ask for screened (¼–½″) compost.

Bag size Custom bag (cu ft) Price per bag ($)

Bulk price per yd³ ($)

How this calculator works & assumptions

Compost is sized by volume: area × depth. Inches become feet by dividing by 12; centimeters divide by 2.54 first.
Sides are converted to feet (inches ÷ 12, meters × 3.28084) before multiplying; 1 m² ≈ 10.76 ft².
Conversions: 1 yd³ = 27 ft³ · 1 ft³ ≈ 7.48 US gallons.
Bag counts are rounded up to the next whole bag, and bag sizes are the nominal volumes printed on the label.
Coverage per bag = bag size ÷ depth — handy for checking how far a pallet will stretch.
Compost settles a little after rain and watering; for delivered loads, round up rather than down.
No weight or density math — moisture content shifts compost weight a lot, so suppliers quote volume.