The formula to calculate the height of the fuel bed in a biomass cookstove is:

\[ H_{fb} = \frac{F_c}{p \cdot \rho_f \cdot A_b} \]

Where:

• \(H_{fb}\) is the height of the fuel bed in meters (m).
• \(F_c\) is the fuel charges in kilograms (kg).
• \(p\) is the packing density (decimal).
• \(\rho_f\) is the density of the fuel in kilograms per cubic meter (kg/m³).
• \(A_b\) is the area of the fuel bed in square meters (m²).