QNH (altimeter setting to mean sea level)

QNH is the pressure setting that makes the altimeter show the aerodrome elevation above mean sea level when the aircraft is on the ground. With QNH set, the altimeter reads altitude.

German term

QNH (Höhenmessereinstellung auf Meereshöhe)

Abbr.

QNH

QNH is reported in hPa in METARs (e.g. Q1018) and by ATC or flight information. Below the transition altitude, VFR pilots fly with the regional or aerodrome QNH so that altitudes on charts, airspace limits and terrain heights are comparable.

For general information only. Always use official sources, your aircraft's flight manual and current national rules for flight decisions.