Educational calculators only. Not for operational flight planning.

Aviation Fuel Mathematics

The arithmetic that links fuel quantity, fuel flow and time: consumption, endurance and trip fuel. You enter every quantity yourself. These pages do not suggest reserves or say how much fuel a flight requires.

Fuel gauge dial reading between half and full beside a half-filled fuel tank labelled usable fuel with a fuel drop above it.

Calculators

Fuel Consumption Calculator

Average fuel flow per hour and fuel per distance from fuel used and time flown.

Aviation Fuel Mathematics

Fuel Required Calculator

Trip fuel from distance, ground speed and fuel flow, plus any extra fuel you enter.

Aviation Fuel Mathematics

Guides

Aviation Fuel Mathematics

Fuel Endurance Mathematics Explained

Endurance is usable fuel divided by fuel flow. See the steps, how sensitive the answer is to fuel flow, and why wind changes range but not endurance.

Aviation Fuel Mathematics

Understanding Aircraft Fuel Consumption

How fuel flow is worked out from fuel used and time, why fuel per mile depends on wind, and why volume and mass of fuel are not interchangeable.