The formula to calculate the burning rate in a biomass furnace is:

$$BR = \frac{FCR}{A_g}$$

Where:

• $BR$ is the burning rate in kilograms per hour per square meter (kg/hr-m²).
• $FCR$ is the fuel consumption rate in kilograms per hour (kg/hr).
• $A_g$ is the grate area in square meters (m²).