Convert Hectopascals to Inches of Mercury
Convert Hectopascals (hPa) to Inches of Mercury (inHg) instantly and accurately.
Conversion Formula
inHg = hPa × 0.0295299833
About Hectopascals
A hectopascal (hPa) = 100 Pa = 1 mbar - the WMO-official SI-compatible meteorological pressure unit since 1986, replacing millibar with no numerical change. All modern surface observations (METAR, SYNOP), digital barometers, aviation weather, and weather apps report in hPa. QNH altimeter settings outside North America are in hPa. ICAO standard sea-level pressure is 1013.25 hPa. Continental high-pressure record exceeds 1084 hPa; Typhoon Tip (1979) holds the low record at ~870 hPa. 1 hPa = 100 Pa.
About Inches of Mercury
One inch of mercury (inHg) ≈ 3,386 Pa - the primary barometric pressure unit in US aviation and meteorology. ASOS weather stations, METARs, and altimeter settings in the US report in inHg. Standard sea-level pressure is 29.92 inHg. Altimeters are set to local QNH in inHg to maintain altitude reference. US barometers for home weather stations display inHg. Typical pressure range: 28.5-31.0 inHg in continental weather systems. Record low: ~25.70 inHg (Typhoon Tip, 1979). 1 inHg = 3,386.39 Pa.
Quick Reference Table
| Hectopascals (hPa) | Inches of Mercury (inHg) |
|---|---|
| 1 hPa | 0.02953 inHg |
| 2 hPa | 0.05906 inHg |
| 5 hPa | 0.14765 inHg |
| 10 hPa | 0.2953 inHg |
| 25 hPa | 0.73825 inHg |
| 50 hPa | 1.4765 inHg |
| 100 hPa | 2.953 inHg |