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.

Fuel quantity (gal)

Fuel quantity in US gallons.

Pounds per gallon (lb/gal)

Weight of one gallon of fuel; defaults to six pounds for avgas.

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

Fuel weight (lb)

Total weight of the fuel load.

• 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.

• Weight Balance Moment Calculator

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

• CG Shift Fuel Calculator

  Calculate the center-of-gravity shift after all specified fuel is burned from its stated arm.

• Landing Weight Calculator

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