What is KGS on Boeing 737? (Kilograms)

Kilograms (KGS) is a unit of measurement commonly used in the aviation industry, including on Boeing 737 aircraft. It is a metric system unit of mass, equivalent to 1000 grams. In the context of aircraft weight, kilograms play a crucial role in ensuring safety, fuel efficiency, and performance. Let’s dive deeper into the significance of kilograms on the Boeing 737.

The Importance of Kilograms in Aircraft Weight

Aircraft weight is a critical factor that affects various aspects of flight operations, including takeoff, cruising, and landing. Every aircraft has specific weight limitations that must be adhered to for safe and efficient operation. In the case of the Boeing 737, kilograms are used to measure the weight of different components, such as fuel, cargo, passengers, and crew.

Proper weight distribution is important for maintaining stability during flight. The weight and balance of the aircraft must be within the specified limits to ensure optimal performance. Exceeding these limits can lead to reduced maneuverability, increased fuel consumption, and even compromised safety.

For example, the maximum takeoff weight (MTOW) of the Boeing 737-800, one of the widely used variants, is approximately 79,015 kilograms. This weight includes the total weight of the aircraft, its contents, and fuel. Similarly, the maximum landing weight (MLW) is around 66,800 kilograms. Operating the aircraft within these weight limits is crucial for safe and efficient operations.

Kilograms and Fuel Efficiency

Fuel efficiency is a significant concern in the aviation industry, not only from an economic standpoint but also in terms of environmental impact. Kilograms play a crucial role in determining the amount of fuel required for a particular flight.

The Boeing 737 has different fuel capacity options depending on the variant and customer requirements. For example, the Boeing 737-800 can carry a maximum of approximately 26,020 liters (or 26,020 kilograms) of fuel. Calculating the amount of fuel needed for a specific flight involves considering various factors, such as the distance to be covered, weather conditions, and payload.

By accurately estimating the fuel required in kilograms, airlines can optimize their fuel planning, reducing unnecessary fuel reserves and carrying the minimum amount necessary for a safe journey. This not only saves costs but also reduces the overall carbon footprint of the flight.

Weight and Balance Calculations

Weight and balance calculations are essential for safe and stable flight operations. These calculations take into account the weight of various components, such as fuel, passengers, cargo, and crew, to ensure the aircraft is loaded correctly.

The center of gravity (CG) of the aircraft must be within a specified range for safe and stable flight. This range is determined based on the structural and aerodynamic characteristics of the aircraft. The CG position affects the aircraft’s maneuverability, stability, and control.

For the Boeing 737, kilograms are used to calculate the weight and balance. The weight of each component, including fuel, passengers, cargo, and crew, is measured in kilograms. These values are then used to determine the CG position and ensure it falls within the acceptable range.

Weight and balance calculations are usually performed using specialized software or manual calculations based on predefined values provided by the aircraft manufacturer. These calculations help airlines and operators determine the optimal distribution of weight on the aircraft and avoid situations that could compromise safety and performance.


Kilograms (KGS) play a vital role in the aviation industry, particularly on Boeing 737 aircraft. They are used to measure the weight of fuel, cargo, passengers, and crew, ensuring safe and efficient flight operations. Adhering to weight limitations, optimizing fuel planning, and maintaining proper weight distribution contribute to the overall safety, fuel efficiency, and performance of the Boeing 737.

For More: What is DFCS on Boeing 737? (Digital Flight Control System)