Measurement Log
| Date | Temperature | Position | Moisture | Status | Notes | Action |
|---|
Formula Used
| Measurement | Formula |
|---|---|
| Average pile temperature | Sum of point temperatures ÷ number of points |
| Ambient difference | Average compost temperature − ambient temperature |
| Temperature change | Current temperature − previous temperature |
| Hourly rate | Temperature change ÷ elapsed hours |
| Daily rate | Hourly rate × 24 |
| Target time | (Target temperature − current average) ÷ hourly rate |
| Uniformity score | 100 − adjusted maximum and minimum temperature spread |
The peak estimate is a practical screening model. It considers pile size, moisture, carbon balance, and recent heating. It does not replace direct thermometer measurements.
How to Use
Choose a temperature unit and analysis mode. Enter current, ambient, and previous readings. Add pile measurements for better estimates.
Enter several monitoring points when available. Add moisture and carbon balance estimates. Then review stage, trends, warnings, and recommendations.
Record repeated readings in the measurement log. Export reports for later comparison. Always verify unusual results with another thermometer.
Example Data
| Input | Example | Purpose |
|---|---|---|
| Current temperature | 52 °C | Represents the latest centre reading. |
| Ambient temperature | 22 °C | Shows heat above outdoor conditions. |
| Previous temperature | 46 °C | Supports heating-rate calculations. |
| Moisture | 55% | Supports moisture guidance. |
| C:N ratio | 28:1 | Supports material balance guidance. |
| Pile dimensions | 1.5 × 1.5 × 1.2 m | Supports volume and peak estimates. |
Frequently Asked Questions
Why measure the pile centre?
The centre often holds the most heat. It reflects active microbial decomposition. Side readings reveal uneven conditions around edges.
How often should readings be taken?
Daily readings suit active hot composting. Slower systems need fewer measurements. Consistent timing improves trend comparisons.
Why is my compost not heating?
The pile may be too small. Moisture or nitrogen may be insufficient. Poor aeration can also suppress microbial activity.
Can excessive heat harm compost?
Very high heat can reduce useful organisms. It can also dry the pile. Turning restores airflow and redistributes hot material.
What does a large temperature spread mean?
Different zones are decomposing unevenly. Edges may be cooler or wetter. Thorough turning usually improves temperature uniformity.
Does the calculator certify sanitation?
No certification is provided here. Requirements vary by material and location. Follow official rules for regulated composting.
Why track ambient temperature?
Ambient temperature provides useful context. Warm weather can raise baseline readings. The difference shows compost-generated heat better.
What moisture range works best?
Many piles perform near moderate moisture. Exact needs depend on materials. Use touch tests with measured estimates.
Can I use Fahrenheit or Kelvin?
Yes, all temperature fields share one unit. Calculations use internal Celsius conversion. Results return in your selected unit.
How accurate is the peak estimate?
The estimate is intentionally approximate. Weather and material structure affect real outcomes. Direct measurements remain the strongest evidence.