Carrying fuel burns fuel. How much, over a year?
Every kilogram loaded above what the flight needs makes the aircraft heavier, and a heavier aircraft burns more. Put in your own numbers to see what that adds up to.
Not all of this is waste
Some extra fuel is the right call: weather at destination, a busy terminal area, or fuel that is cheaper at the departure airport than at the next one. The calculator shows what carrying the extra costs. It can't tell you how much of it was needed.
That is the question Fleet Intelligence answers. It compares what each flight carried and burned with what it should have, given its route, weight, time and season, and separates the extra that had a reason from the extra that is habit.
How it's worked out
Extra burn per flight = extra fuel carried × carry cost × flight time. Multiplied by flights per day, 365 days and the number of aircraft.
CO₂ uses 3.16 kg of CO₂ per kilogram of jet fuel, the factor used in international aviation emissions reporting.