Compost Volume Mixing Planner
Use equal-size containers to plan an initial mix of two to three volumes of browns per volume of greens. This is a starting recipe, not a laboratory carbon-to-nitrogen measurement.
Fill equal-size buckets similarly without compacting the material. The result only compares volumes. Moisture, density and elemental composition are not measured, and no exact C:N ratio or heating outcome is inferred.
Frequently asked questions
What does this planner calculate?
It compares the volumes of browns and greens you enter with a practical home-compost starting mix. It does not calculate elemental carbon-to-nitrogen content or predict compost temperature.
Why use two to three parts browns?
EPA home-compost guidance suggests roughly two to three volumes of browns per volume of greens. Material density, moisture and particle size vary, so monitor the pile and adjust moisture and aeration as needed.
What materials fit these groups?
Dry leaves, shredded uncoated cardboard and untreated woody material can supply browns; fruit and vegetable scraps and fresh plant trimmings supply greens. Follow EPA guidance on materials to avoid, including pet waste, meat and dairy.
What if the pile smells or stays cold?
Check moisture, aeration, materials and pile size rather than assuming the ratio is the only cause. Mix in dry browns when the pile is too wet, add water when dry, and keep air moving through the pile.
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