Use this calculator for flight-planning study or a first-pass cross-check when all inputs describe the same aircraft, atmospheric condition, and phase of flight.

Empty weight (lb)

Basic empty weight of the aircraft.

Max takeoff weight (lb)

Maximum certified takeoff weight.

Compute the useful load as the difference between max takeoff weight and empty weight. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Useful load (lb)

Combined weight of crew, passengers, cargo, and fuel.

• Do not use a generic calculator in place of the current aircraft flight manual, approved performance data, operating limitations, NOTAMs, weather, or regulations. Real performance changes with configuration, runway condition, altitude, temperature, wind, loading, and technique.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Cross-check the result against the aircraft flight manual or approved planning system, then apply the required safety margins. Keep signed wind, heading, altitude, speed, and fuel conventions explicit.

• Payload Available Calculator

  Compute the remaining payload capacity after subtracting empty weight and fuel from max takeoff weight.

• Fuel Weight Calculator

  Compute the weight of a fuel load from its volume and density.

• Landing Weight Calculator

  Compute the landing weight by subtracting trip fuel from the takeoff weight.