Hay Box Cooker Calculator
Calculate heat retention time, temperature curve, and fuel savings for a hay box (retained heat) cooker based on pot size, insulation, and food mass.
Inputs
Results
Time above 75 °C
17.7 hours
How to Use This Calculator
- Enter the mass of food plus liquid in the pot (kg) and pot diameter (cm).
- Set the starting temperature (typically boiling, 100 °C) and insulation R-value.
- Enter ambient room temperature.
- The calculator shows how long food stays above 75 °C (safe cooking zone) and above 60 °C, plus temperatures after 2, 4, and 8 hours.
- Bring food to a full boil on your stove, then transfer immediately to the insulated box for hands-free retained-heat cooking.
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