Convert pressure units — Pascal, bar, PSI, atm, Torr, mmHg.
| Unit | Name | Value |
|---|---|---|
| Pa | Pascal | 3386.39 |
| kPa | Kilopascal | 3.38639 |
| bar | Bar | 0.0338639 |
| atm | Atmosphere | 0.033421071 |
| psi | PSI | 0.49115415 |
| Torr | Torr / mmHg | 25.400084 |
Formula: Bar = Inch Hg × 0.03386
Multiply any inch hg value by 0.03386 to get bar.
Reverse: Inch Hg = Bar × 29.53
Common inch hg values — factor: 1 inHg = 0.03386 bar
| Inch Hg (inHg) | Bar (bar) | Context |
|---|---|---|
| 0.01 inHg | 0.0003386 bar | Near vacuum |
| 0.1 inHg | 0.003386 bar | Very low |
| 1 inHg | 0.03386 bar | Low pressure |
| 10 inHg | 0.3386 bar | ~10 inHg |
| 20 inHg | 0.6773 bar | ~20 inHg |
| 25 inHg | 0.8466 bar | Low weather |
| 28 inHg | 0.9482 bar | Hurricane center |
| 29 inHg | 0.9821 bar | Storm low |
| 29.92 inHg | 1.013 bar | 1 standard atm |
| 30 inHg | 1.016 bar | Slightly high |
| 31 inHg | 1.05 bar | High pressure |
| 35 inHg | 1.185 bar | Very high |
| 50 inHg | 1.693 bar | ~1.67 atm |
| 100 inHg | 3.386 bar | ~3.34 atm |
| 1,000 inHg | 33.86 bar | ~33.4 atm |
1 inHg = 0.03386 bar. Memorize for instant estimates.
Use 0.0339 as a quick mental multiplier.
Multiply result by 29.53 to recover the original inHg value.
Sets altimeter QNH and reads weather ATIS in inHg — standard US aviation.
Reports barometric pressure in inHg for US television and radio weather.
Measures duct static pressure in inches of water column or inHg in US systems.
Checks HVAC system static pressure and duct leakage in inHg.
Logs surface pressure in inHg for propagation prediction and wx stations.
References inHg barometric pressure when using US-spec nautical instruments.
Inches of mercury (inHg) is the pressure unit used in US aviation and weather reporting, defined as the pressure exerted by a 1-inch column of mercury (3,386.39 Pa). It has been standard in US aviation since the early 20th century.
US aviation altimeters are set in inHg (standard: 29.92 inHg). US weather broadcasts report barometric pressure in inHg. HVAC engineers in the US use inHg for duct static pressure measurements.
Interesting fact: Pilots set their altimeter to the local QNH (pressure at sea level) in inHg to ensure their altitude reading is accurate — a difference of 0.1 inHg causes an altimeter error of about 100 feet.
The bar is a metric unit of pressure equal to exactly 100,000 pascals — very close to standard atmospheric pressure (1 atm = 1.01325 bar). It was introduced in 1909 and is widely used in Europe for weather forecasting, diving, and industrial applications.
Scuba diving cylinders are filled to 200–300 bar. Automotive tire pressure gauges often display in bar across Europe. Industrial compressors and hydraulic systems are commonly rated in bar.
Interesting fact: The millibar (mbar = hPa) is the standard unit for atmospheric pressure in meteorology worldwide. Standard sea-level atmospheric pressure is 1013.25 mbar.
Converting inch hg to bar is a common task in engineering, medicine, meteorology, and science. Different industries and countries use different pressure units — PSI in the US, bar in Europe, mmHg in medicine, and pascals in physics — making accurate conversion essential for cross-disciplinary work.
Quick reference: 5 inHg = 0.1693 bar and 10 inHg = 0.3386 bar. For the reverse: 1 bar = 29.53 inHg. The exact factor is 1 inHg = 0.03386 bar.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.