Flight level converter
Convert flight levels to feet and meters, and see the air pressure up there.
That's about the same as an airliner cruising. The standard atmosphere there is about 238.4 hPa.
What it means
How high is that?
A flight level is a pressure altitude on the 1013.25 hPa standard setting, not a height above the ground. On a cold day the aircraft is genuinely lower than the level says.
Every unit
Your altitude in every unit
Learn
Three things worth knowing
-
FL350 is 35,000 feet
Multiply by 100. In meters that is 10,668 — which is why cruising altitude gets quoted as "about eleven kilometers".
-
One setting for everyone
Altimeters measure pressure, and pressure changes with the weather. Standardizing the setting above the transition altitude means every aircraft is wrong by the same amount, which is what keeps them apart.
-
A level is not a height
FL100 over a mountain range may clear the ground by very little. Below the transition altitude, aircraft use the local pressure setting for exactly this reason.
Shortcuts
Popular altitude conversions
Background
About flight levels
Above the transition altitude, every aircraft sets its altimeter to the same standard pressure and reports a flight level: hundreds of feet, so FL350 is 35,000 ft.
The point is separation, not height. If every aircraft uses the same reference, they stay apart even when the whole sheet of air moves up or down with the weather.