Barometric Pressure Converter
Convert barometric pressure between inHg, hPa, mbar, mmHg, atm, and psi.
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Barometric (atmospheric) pressure is measured in several units.
Standard atmospheric pressure at sea level:
- 29.92 inHg (inches of mercury)
- 1013.25 hPa (hectopascals)
- 1013.25 mbar (millibars) — same as hPa
- 760 mmHg (millimeters of mercury)
- 1 atm (atmosphere)
- 14.696 psi (pounds per square inch)
Conversion factors (from 1 inHg):
- 1 inHg = 33.8639 hPa = 33.8639 mbar
- 1 inHg = 25.4 mmHg
- 1 inHg = 0.49115 psi
Weather context:
- High pressure (fair weather): 30.20+ inHg (1023+ hPa)
- Normal pressure: 29.80-30.20 inHg (1009-1023 hPa)
- Low pressure (storms): < 29.80 inHg (< 1009 hPa)
- Hurricane central pressure: < 28.00 inHg (< 948 hPa)