inHg ↔ hPa Converter
Convert between inches of mercury and hectopascals (millibars). The US uses inHg for altimeter settings while most of the world uses hPa.
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Formula
1 inHg = 33.8639 hPa 1 hPa = 0.02953 inHg
Multiply inHg by 33.8639 to get hPa, or hPa by 0.02953 to get inHg.
Reference Table
| inHg | hPa | Context |
|---|---|---|
| 28.00 | 948 | Very low pressure — significant weather |
| 29.00 | 982 | Below standard — PA above field elevation |
| 29.92 | 1013.25 | Standard atmosphere setting |
| 30.50 | 1033 | High pressure system |
| 31.00 | 1050 | Near maximum typical pressure |
Aviation Context
In the US, altimeter settings are given in inHg (e.g., 29.92). When flying internationally, pilots must set the altimeter in hPa (QNH). At the transition altitude, the altimeter is set to standard (29.92 inHg / 1013.25 hPa) for flight level operations. Understanding this conversion is essential for international flight planning.
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