Aircraft Weight and Balance Calculator
Perform precise center of gravity calculations for flight safety.
Understanding Aircraft Weight and Balance
Safety in aviation begins long before the engines start. The aircraft weight and balance calculation is a critical pre-flight process that determines if an aircraft is loaded within its structural and aerodynamic limits. Every aircraft has a specific Gross Weight limit and a Center of Gravity (CG) envelope. Operating outside these limits can lead to catastrophic structural failure or loss of control during takeoff, cruise, or landing.
How to Use This Calculator
To use this calculator, you will need the specific data from your aircraft's Pilot Operating Handbook (POH). Follow these steps:
- Empty Weight: Enter the basic empty weight and the arm (longitudinal distance from the datum) for your specific tail number.
- Payload: Enter the weight for the front seats, rear seats, and baggage areas. Ensure you use the correct arm for each station.
- Fuel: Enter the fuel quantity in gallons. This calculator automatically converts Avgas to weight using the standard factor of 6 lbs per gallon.
- Review Results: The tool will calculate the Total Moment and the final Center of Gravity. You must then verify these results against the CG envelope graph in your POH.
Why Center of Gravity (CG) Matters
The Center of Gravity is the theoretical point where the aircraft would balance if suspended. If the CG is too far forward, the aircraft may be "nose-heavy," making it difficult to rotate during takeoff or flare during landing. If the CG is too far aft (rearward), the aircraft becomes inherently unstable and may be impossible to recover from a stall. This calculator helps pilots ensure that the "Arm" (distance from the reference datum) and the resulting "Moment" (weight x arm) keep the CG in a safe range.
Frequently Asked Questions
What is the Datum? The datum is an imaginary vertical plane from which all horizontal distances are measured for weight and balance purposes.
Can I fly if I am over gross weight but the CG is correct? No. Exceeding gross weight limits can lead to structural damage, decreased climb performance, and higher stall speeds.
How does fuel burn affect CG? As fuel is consumed during flight, the total weight decreases and the CG often shifts. Pilots should calculate both takeoff and landing weight and balance to ensure safety throughout the entire duration of the flight.