How many bars is 1 inHg?

1 inch of mercury (inHg) equals approximately 0.033864 bar. This is derived from the NIST definition: 1 inHg = 3,386.389 pascals, and 1 bar = 100,000 pascals.

How do I convert inHg to bar manually?

Multiply the inHg value by 0.033864. For example, 29.921 inHg × 0.033864 = 1.0132 bar (approximately 1 atmosphere).

What is standard atmospheric pressure in bars?

Standard atmospheric pressure is 29.921 inHg, which equals 1.01325 bar. This is the reference point used in meteorology and aviation.

Why is inHg used for barometric pressure in the US?

Inches of mercury (inHg) originated with mercury barometers, where pressure is measured by how high a mercury column rises in a tube. It remains the standard unit for barometric pressure in US aviation and weather reporting.

What is the difference between inHg and bar?

Inch of mercury (inHg) is an imperial/US unit derived from the height of a mercury column. Bar is a metric unit; 1 bar = 100,000 pascals. 1 inHg ≈ 0.033864 bar.

inHg to Bars Converter

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

Enter a pressure in inHg and get the bar equivalent instantly — reverse bar-to-inHg conversion included.

Converter

Pressure in inHg

Result in bar

Reverse: bar to inHg

Pressure in bar

Result in inHg

Reference Table

inHg bar

1 inHg 0.033864

10 inHg 0.33864

20 inHg 0.67727

25 inHg 0.84660

29.53 inHg 1.00000

29.921 inHg (1 atm) 1.01325

30 inHg 1.01591

31 inHg 1.04979

35 inHg 1.18523

40 inHg 1.35455

50 inHg 1.69319

100 inHg 3.38639

Summary

Enter a pressure in inHg and get the bar equivalent instantly — reverse bar-to-inHg conversion included.

How it works

Enter the pressure value in inches of mercury (inHg) in the top input field.
The bar result appears instantly with no button needed.
Use the reverse field to convert bars back to inHg.
Click "Copy" next to any result to copy it to your clipboard.
Check the reference table for common inHg-to-bar values.

Use cases

Convert US aviation altimeter settings from inHg to bar for metric instruments.
Translate weather station barometric readings from inHg to bar for international reports.
Check HVAC system pressure specs when switching between US and metric datasheets.
Convert vacuum pump specifications listed in inHg to bar for European lab equipment.
Interpret weather forecast data when the source uses inHg but your display shows bar.
Cross-verify tire inflation gauges that report in different pressure units.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu