Tempo compostagem
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The 'Composting Time' calculator estimates the organic decomposition time of waste based on the carbon-to-nitrogen (C:N) ratio of the material. The formula used is t = (60 / C:N_ratio) × 30, where 'C:N_ratio' represents the carbon-nitrogen balance in the mixture. Lower C:N ratios indicate higher nitrogen content, speeding up the process.
This tool is useful for organic gardening, household waste management, and small-scale composting projects. The result provides an estimate in days under ideal humidity, temperature, and aeration conditions. For better results, mix materials with balanced C:N ratios, such as dry leaves (high C:N) and kitchen scraps (low C:N).
Important: the formula is an approximation and does not replace laboratory analysis of the material. Factors like microbial diversity, heavy metals, or acidity can affect real-time results. Always validate with practical observations and adjust the formula according to local experience.
Frequently asked questions
How does the C:N ratio affect composting time?
The C:N ratio indicates the carbon-to-nitrogen balance. Lower values (e.g., 20:1) speed up the process, while higher values (e.g., 40:1) slow it down, as microbes need nitrogen to reproduce rapidly.
Do I need to measure moisture content for the formula?
The formula doesn't include moisture, but in practice, optimum humidity (40-60%) is crucial for microbial activity. Adjust the mix if the material is too dry or wet.
Can this calculator be used for industrial composting?
The formula is designed for home or small-scale composting. Industrial processes require controlled temperature, aeration, and scaling adjustments not covered by this tool.
Why does the formula multiply by 30?
The factor 30 represents average days for ideal decomposition, considering microbial growth cycles and compost stabilization. It's an approximation based on organic composting studies.