BSFC = (Fuel Consumption Rate / Power Output)
Where:
Fuel Consumption Rate: Rate at which fuel is consumed by the engine (usually measured in Litres per Hour or Grams per Second).
Power Output: The actual power developed by the engine at a specific load (usually measured in Watts or Kilowatts).
To simplify this further, a lower BSFC value indicates better fuel efficiency, while a higher BSFC value represents lower fuel efficiency.