Fuel Fraction Calculator

In flight mechanics, the fuel fraction refers to the proportion of an aircraft’s total takeoff weight that is attributed to the weight of the fuel. It is a key parameter used in aviation to assess fuel efficiency, endurance, and range during various phases of flight, particularly during takeoff. An increase in the fuel fraction results in a higher fuel weight and, consequently, a greater total takeoff weight. The formula to calculate Fuel fraction as follows:

Where:

  • : Fuel fraction, 
  • : Fuel weight on board for takeoff.
  • : Total takeoff weight of the aircraft.

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