Altitude Converter
Convert between feet, meters, and flight levels — plus ICAO standard pressure at altitude.
How to Use
- Enter any altitude — others convert.
Altitude
ICAO standard
Notes
Flight level
FL350 = 35 000 ft on standard pressure
Transition alt (US)
18 000 ft — above = flight level, below = MSL
ISA lapse
−2 °C per 1 000 ft (up to 36 000 ft)
Pressure (ISA)
P = 29.92 · (1 − alt/145 442)^5.256 inHg
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