How many inHg is 1 psi?

1 psi equals approximately 2.03602 inHg. For quick mental math, multiply any psi value by 2.036 to get inches of mercury.

How do I convert psi to inHg manually?

Multiply the psi value by 2.036020723. For example, 14.696 psi (standard atmosphere) × 2.036020723 = 29.921 inHg.

What is standard atmospheric pressure in inHg?

Standard atmospheric pressure is 14.696 psi, which equals 29.921 inHg. Pilots and meteorologists use 29.92 inHg as the standard altimeter setting (1013.25 hPa).

Why is inHg used in aviation?

Inches of mercury has been used in barometry since the 17th century. US aviation adopted inHg for altimeter settings because most legacy instruments were calibrated in those units. ICAO countries outside the US typically use hectopascals (hPa) instead.

What is 30 inHg in psi?

30 inHg equals approximately 14.74 psi — very close to standard sea-level atmospheric pressure (14.696 psi = 29.921 inHg).

Is psi or inHg more common for tire pressure?

PSI is the standard unit for tire pressure in the United States. InHg is used almost exclusively for atmospheric/barometric pressure in weather and aviation — you would not measure tire pressure in inHg.

PSI to inHg Converter

Name: PSI to inHg Converter
Availability: InStock
Author: Nham Vu

Enter a pressure in PSI and get the inches of mercury (inHg) equivalent instantly — reverse inHg-to-PSI conversion included.

Converter

Pressure in psi

Result in inHg

Reverse: inHg to psi

Pressure in inHg

Result in psi

Reference Table

PSI inHg

1 psi 2.0360

5 psi 10.180

10 psi 20.360

14.696 psi (1 atm) 29.921

15 psi 30.540

20 psi 40.720

25 psi 50.901

30 psi 61.081

35 psi 71.261

40 psi 81.441

60 psi 122.16

100 psi 203.60

Conversion factor: 1 psi = 2.036020723 inHg (exact, derived from mercury density at 0 °C and standard gravity).

Summary

Enter a pressure in PSI and get the inches of mercury (inHg) equivalent instantly — reverse inHg-to-PSI conversion included.

How it works

Enter the pressure value in PSI in the top input field.
The inHg result appears instantly as you type.
Use the reverse field to convert inHg back to PSI.
Click "Copy" next to any result to copy it to your clipboard.
Check the reference table for common PSI-to-inHg values.

Use cases

Convert barometric pressure from PSI to inHg for METAR and weather reports.
Set aircraft altimeters: translate PSI sensor readings to inHg altimeter settings.
Cross-check tire inflation gauges (in psi) against inHg vacuum gauges.
Convert industrial pressure sensor output (psi) to inHg for HVAC vacuum testing.
Translate pressure specifications in US datasheets to inHg for weather instruments.
Verify atmospheric pressure values in meteorological research between psi and inHg.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu