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Aircraft Weight & Balance Calculator

Compute total weight, total moment, and CG position for any aircraft loading configuration. Enter each station's weight and arm to verify your aircraft is within the approved CG envelope before flight.

W&B Calculator

Reminder: Always verify results against the aircraft's approved Weight & Balance Manual. This tool is for reference only.
Total Weight
—
lbs
Total Moment
—
lbs·in
CG Position
—
in

About Weight & Balance

Weight & Balance (W&B) is a fundamental airworthiness requirement. Every flight must be conducted within the aircraft's approved weight and CG envelope as defined in the Aircraft Flight Manual (AFM) or Pilot's Operating Handbook (POH).

Moment
Moment = Weight × Arm

The product of a weight and its distance from the datum reference point.

Center of Gravity
CG = Total Moment ÷ Total Weight

The point at which the aircraft would balance if suspended.

Pro Tip for AMEs: When computing W&B after a modification (STC, repair), always update the aircraft's Weight & Balance report and retain it in the aircraft records per EASA Part-M / FAA 14 CFR §91.9.

Common Stations

StationDescription
Empty WeightAircraft basic empty weight (BEW)
Pilot / CrewFront seat occupants
PassengersRear/cabin seat occupants
FuelUsable fuel at takeoff
Baggage / CargoAft or forward compartments
Zero FuelAll items except usable fuel

Frequently Asked Questions

The datum is an imaginary vertical plane from which all horizontal distances (arms) are measured. Its location is defined by the manufacturer in the AFM/POH (e.g., firewall, nose, or a point ahead of the nose).

An out-of-CG condition can make the aircraft uncontrollable or unstable. Forward CG increases stall speed and requires more elevator authority; aft CG reduces longitudinal stability and can lead to loss of control.

ZFW is the maximum certificated weight of the aircraft without usable fuel. It limits structural loads on the wing root during flight. Any weight above ZFW must be fuel.

Operators must recalculate W&B for every flight. Additionally, a new aircraft weighing is required after any modification, repair, or at intervals defined by the operator's approved programme (typically every 4–9 years under EASA).

MTOW (Maximum Take-Off Weight) is the maximum weight at the start of the take-off roll. MZFW (Maximum Zero Fuel Weight) is the maximum weight without usable fuel. The difference between them represents the minimum fuel that must be carried if at MZFW.