Pascals to inHg Converter

Summary

This tool converts pressure values from pascals (Pa) or kilopascals (kPa) to inches of mercury (inHg), the unit used in aviation altimeters, weather stations, and HVAC systems across the United States. One inch of mercury equals exactly 3,386.389 pascals, based on the standard density of mercury and gravitational acceleration. Use it to translate barometric pressure readings, set altimeter pressure, or convert HVAC static pressure specs.

How it works

1. Select your input unit: Pa or kPa.
2. Type the pressure value into the input field.
3. The converter shows the equivalent in inHg instantly.
4. Click the swap button to convert inHg back to Pa.
5. Copy either result with the copy button next to each value.
6. Scroll down for a quick-reference table of common pressures.

Use cases

• Convert barometric pressure from Pa (weather APIs) to inHg for US-standard weather displays.
• Set an aviation altimeter: translate QNH in Pa to the inHg setting required by US aircraft.
• Convert HVAC static pressure specs between Pa (SI) and inHg (US duct design standards).
• Cross-check a pressure transducer output in Pa against an inHg-rated manometer.
• Translate meteorological data published in Pa to the inHg scale used by US broadcasters.
• Verify vacuum pump performance specs given in Pa against inHg-rated vacuum gauges.

Frequently Asked Questions