Convert Inches of Mercury to Micropascals
Convert Inches of Mercury (inHg) to Micropascals (µPa) instantly and accurately.
Conversion Formula
µPa = inHg × 3386388640
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.
About Micropascals
A micropascal (µPa) is 10⁻⁶ Pa - the standard reference unit for sound pressure levels in acoustics. The threshold of human hearing in air is 20 µPa, which defines 0 dB SPL; underwater acoustics uses 1 µPa as its reference (0 dB re 1 µPa). Blue whale calls reach ~189 dB re 1 µPa at source. Industrial noise regulations, architectural acoustics, and loudspeaker sensitivity specifications all trace back to µPa reference levels. Solar wind pressure near Earth averages ~1-6 nPa, rising to hundreds of µPa during major solar storms. 1 µPa = 10⁻⁶ Pa.
Quick Reference Table
| Inches of Mercury (inHg) | Micropascals (µPa) |
|---|---|
| 1 inHg | 3.386 × 109 µPa |
| 2 inHg | 6.773 × 109 µPa |
| 5 inHg | 1.693 × 1010 µPa |
| 10 inHg | 3.386 × 1010 µPa |
| 25 inHg | 8.466 × 1010 µPa |
| 50 inHg | 1.693 × 1011 µPa |
| 100 inHg | 3.386 × 1011 µPa |