Work out endurance of flight instantly with clear inputs, formula shown and shareable results.
Endurance is usable fuel divided by burn rate. What matters operationally is endurance after reserves: subtract the fuel you have committed to keep, and what remains is the flying time actually available for the trip.
Endurance
Gross endurance = usable fuel / burn per hour; usable = gross - reserve time
Aviation results are planning estimates only. Always verify take-off, landing, fuel, weight and balance figures against the certified Aircraft Flight Manual, current performance charts and applicable aviation regulations before flight.
Some fuel in every tank cannot reach the engine in normal attitudes. The AFM states usable quantity, and that is the only figure to plan with.
Yes. Higher cruise usually lowers fuel flow, so endurance improves even though true airspeed rises.