Compost Calculator
Calculate compost ratios, materials, and requirements for optimal composting
Note: This calculator determines optimal compost ratios and material requirements. The ideal C:N ratio is 25-30:1 for most composting systems.
Formula: C:N Ratio = Total Carbon ÷ Total Nitrogen
Volume = Weight ÷ Bulk Density × Moisture Factor
Current C:N Ratio
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Materials Needed for Target Ratio
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Total Compost Volume
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Estimated Composting Time
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Moisture Requirements
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Aeration Frequency
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Material Input Recommendations
- Green Materials: -
- Brown Materials: -
- Manure: -
- Water: -
Composting Best Practices
- Layering: Alternate green and brown materials in 2-4 inch layers
- Moisture: Maintain 40-60% moisture content (feels like a wrung-out sponge)
- Aeration: Turn pile every 1-2 weeks for hot composting
- Temperature: Hot composting reaches 130-160°F for optimal decomposition
- Size: Maintain pile size of at least 3x3x3 feet for hot composting
Common Material C:N Ratios
Green Materials (High Nitrogen)
Fresh grass clippings: 15:1
Kitchen scraps: 15:1
Fresh leaves: 20:1
Manure: 15:1
Brown Materials (High Carbon)
Dry leaves: 60:1
Straw: 80:1
Wood chips: 400:1
Sawdust: 500:1
Balanced Materials
Food waste: 20:1
Garden waste: 25:1
Mixed yard waste: 30:1
Compost: 15:1
Important: These calculations are estimates based on typical material properties.
Actual composting results may vary based on material quality, environmental conditions, and management practices.
Always monitor temperature, moisture, and odor to ensure proper composting conditions.