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.

Weight (lb)

Item weight.

Arm (in)

Arm distance of the item from the reference datum.

Compute the load moment from a weight and its arm distance. 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]

Moment (lb·in)

Moment about the datum.

• 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.

• Fuel Weight Calculator

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

• Total Moment Calculator

  Compute the moment of a weight applied at a given arm.

• Weight Shift CG Calculator

  Compute how far the center of gravity moves when a load is shifted a given distance.