The formula to calculate the power output of a biomass cookstove is:

\[ P_o = \frac{F_c \cdot H_f}{T_b} \]

Where:

• \(P_o\) is the power output in KCal/hr.
• \(F_c\) is the fuel charges in kilograms (kg).
• \(H_f\) is the heating value of the fuel in KCal/kg.
• \(T_b\) is the total burning time in hours (hr).