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Gardening Calculators

Compost Calculator

Compost needed for beds and borders, and how much your kitchen waste will make.

Enter values

Results update as you type.

Result

Compost needed

1.5 m³

In litres
1,500
50 litre bags
30
Weight
1,050 kg
Bulk bags (0.7 m³)
3
Coverage per bulk bag
14 m²

About the Compost Calculator

Compost needed for beds and borders, and how much your kitchen waste will make.

Also known as: compost quantity calculator, how much compost, compost bin calculator, garden compost volume.

How to use this calculator

  1. Enter calculate and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

volume = area × depth · compost yield ≈ 30% of raw waste by weight

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: Compost needed
  • Area = 30 m²
  • Depth to apply = 50 mm

the calculator returns:

  • Compost needed: 1.5 m³
  • In litres: 1,500
  • 50 litre bags: 30
  • Weight: 1,050 kg