Garden & Outdoor calculator
What Compost Bin Size Do I Need?
Use weekly compostable material volume, average material retention weeks, settled/original volume ratio to find compost bin capacity.
Enter your measurements
What Compost Bin Size Do I Need uses weekly compostable material volume, average material retention weeks, settled/original volume ratio and the other configured measurements to return compost bin capacity with a formula written specifically for this tool.
- Weekly compostable material volume — Required
- Average material retention weeks — Required
- Settled/original volume ratio — Required
- Headspace fraction — Required
Compost bin capacity
Enter the measurements above to calculate compost bin capacity.
How the calculation works
V9 calculation: requiredVolume=weeklyCompostableVolume×retentionWeeks×settlingFactor/(1-headspace). The result is reported as compost bin capacity.
Worked example
Example: Weekly compostable material volume = 50 L; Average material retention weeks = 8; Settled/original volume ratio = 0.3; Headspace fraction = 20%. Result: Required Volume = 150 L.
Before you decide
Measure the actual item, opening or body dimension involved. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what compost bin size do i need, the limiting result on this page is compost bin capacity.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Compost Bin Size calculator tell me?
It returns compost bin capacity from the measurements entered on this page. The calculation is specific to compost bin size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for compost bin size?
Measure weekly compostable material volume, average material retention weeks, settled/original volume ratio, headspace fraction. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the compost bin capacity?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned compost bin capacity while allowing for the clearances, tolerances or ratings shown by its manufacturer.