The formula to calculate the fuel consumption rate of a biomass cookstove is:

\[ FCR = \frac{W_{fc}}{T_o} \]

Where:

• \(FCR\) is the fuel consumption rate in kilograms per hour (kg/hr).
• \(W_{fc}\) is the weight of fuel consumed in kilograms (kg).
• \(T_o\) is the operating time in hours (hr).