Garden Composting Calculator
Garden Composting Calculator — measure your garden composting impact. Evidence-based formula with reduction tips.
Waste-diversion estimates translate reusable, composted, or recycled material into annual tonnage kept away from disposal and an indicative avoided-emissions benefit.
Put the estimate in context with the Circular Economy Calculator and Carbon Footprint Calculator. Replace starter assumptions with measured local data whenever the decision depends on a site, tariff, material, or formal reporting method.
- Choose a time period and unit that match the activity you are measuring.
- Enter measured usage, area, material, or cost values where available.
- Review each output alongside the assumptions shown in the formula.
- Compare alternatives using the same inputs and time horizon.
Calculation approach
Avoided emissions = annual material × diversion rate × material factor.
The calculator keeps each quantity visible so that an assumption can be checked or replaced.
Using your waste-diversion calculator result
Compare like with like
Use the result to compare two plans that use the same boundary, units, and timeframe. A single estimate is most useful when it leads to a specific next measurement or reduction action.
Ecology tips and best practices
- Document the source and date of any emission factor, tariff, or local measurement used.
- Keep operational estimates separate from long-term capital or restoration benefits.
- Use the Ocean Plastic Calculator for a related environmental planning calculation.
- Small recurring changes can become material when annualised.
- Local climate, grid mix, material supply chains, and management quality can change a result substantially.
Common mistakes to avoid
- Combining figures that cover different periods or boundaries.
- Using a generic factor when a local measured value is available.
- Treating a planning estimate as regulated carbon, biodiversity, or environmental reporting.
This calculator provides a simplified planning estimate, not a regulated environmental assessment, carbon inventory, biodiversity survey, engineering design, or professional advice.