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

\[ BR = \frac{P_o}{H_f} \]

Where:

• \(BR\) is the burning rate in kilograms per hour (kg/hr).
• \(P_o\) is the power output in KCal/hr.
• \(H_f\) is the heating value of the fuel in KCal/kg.