Aviation Pressure Unit Converter

Convert between Pascal, hPa, Bar, PSI, mmHg, inHg, and standard atmosphere (atm) for aircraft systems, cabin pressurization, and altimeter calibration. Used by AMEs, pilots, and engineers for maintenance, flight planning, and troubleshooting.

Pressure Conversion Tool

Pascal (Pa)

Hectopascal (hPa)

Bar

PSI

mmHg

inHg

Standard Atmosphere

Why Pressure Unit Conversion Matters in Aviation

Accurate pressure conversions are critical for:

Altimeter settings: METAR reports in inHg or hPa
Cabin pressurization: Differential pressure in psi or bar
Oxygen systems: Cylinder pressure in psi or bar
Vacuum systems: Measured in inHg below ambient

Standard Aviation Pressure Reference

Condition	hPa	inHg	psi
Standard Sea Level	1013.25	29.92	14.7
Tropopause (36,000 ft)	226.32	6.68	3.27
Cabin Differential (typical)	—	—	8.0

Source: ICAO Standard Atmosphere, FAA AIM §7-2-2