Compost volume calculator
Work out bin capacity and split the material you need to add using your own volume recipe.
Up to 1,000 bins and 50 recipe lines. No decomposition rate, compost maturity, mass or ingredient suitability is predicted. Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.
Your result
How to use Compost volume calculator
- Enter your measured quantities, units and assumptions.
- Review the calculated result and the stated limits.
- Download the report or plan for your project.
Useful next steps
Measure the usable space
Choose rectangular or cylindrical bins, measure the inside and enter the number of identical bins. Target fill and existing material apply to their combined capacity.
Build a volume recipe
Enter material names with relative volume parts. The example 2:1 mix is editable and is not a carbon-to-nitrogen recommendation. The retained-volume percentage converts the remaining settled space to loose additions.
Save the measurements and assumptions
Download CSV and a text or JSON report. The calculation runs on your device. Changing a unit keeps the number you entered, so check both before using the result.