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: Pascal = Inch Hg × 3386
Multiply any inch hg value by 3386 to get pascal.
Reverse: Inch Hg = Pascal × 0.0002953
Common inch hg values — factor: 1 inHg = 3386 Pa
| Inch Hg (inHg) | Pascal (Pa) | Context |
|---|---|---|
| 0.01 inHg | 33.86 Pa | Near vacuum |
| 0.1 inHg | 338.6 Pa | Very low |
| 1 inHg | 3,386 Pa | Low pressure |
| 10 inHg | 3.386e+04 Pa | ~10 inHg |
| 20 inHg | 6.773e+04 Pa | ~20 inHg |
| 25 inHg | 8.466e+04 Pa | Low weather |
| 28 inHg | 9.482e+04 Pa | Hurricane center |
| 29 inHg | 9.821e+04 Pa | Storm low |
| 29.92 inHg | 101,300 Pa | 1 standard atm |
| 30 inHg | 101,600 Pa | Slightly high |
| 31 inHg | 105,000 Pa | High pressure |
| 35 inHg | 118,500 Pa | Very high |
| 50 inHg | 169,300 Pa | ~1.67 atm |
| 100 inHg | 338,600 Pa | ~3.34 atm |
| 1,000 inHg | 3,386,000 Pa | ~33.4 atm |
1 inHg = 3386 Pa. Memorize for instant estimates.
Use 3386 as a quick mental multiplier.
Multiply result by 0.0002953 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 pascal (Pa) is the SI derived unit of pressure, defined as one newton per square meter. It was named after Blaise Pascal, the 17th-century French mathematician and physicist who studied fluid pressure. The unit was officially adopted by the International System of Units in 1971.
Pascals are used in meteorology (atmospheric pressure ~101,325 Pa), materials science (Young's modulus in GPa), and fluid mechanics. The pascal is very small — standard atmospheric pressure equals 101,325 Pa.
Interesting fact: Blaise Pascal demonstrated in 1648 that atmospheric pressure decreases with altitude by carrying a barometer up the Puy de Dôme mountain, confirming Torricelli's theory of atmospheric pressure.
Converting inch hg to pascal 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 = 1.693e+04 Pa and 10 inHg = 3.386e+04 Pa. For the reverse: 1 Pa = 0.0002953 inHg. The exact factor is 1 inHg = 3386 Pa.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.