Convert pressure units — pascal, PSI, bar, atmosphere, torr, mmHg and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 inHg | 3.38639e-06 MPa | |
| 0.01 inHg | 3.38639e-05 MPa | |
| 0.1 inHg | 0.000338639 MPa | |
| 1 inHg | 0.00338639 MPa | |
| 5 inHg | 0.016932 MPa | |
| 10 inHg | 0.0338639 MPa | |
| 50 inHg | 0.16932 MPa | |
| 100 inHg | 0.338639 MPa | |
| 1000 inHg | 3.38639 MPa |
Formula: Megapascal = Inch Hg × 0.003386
Multiply any inch hg value by 0.003386 to get megapascal.
Reverse: Inch Hg = Megapascal × 295.3
Common inch hg values — factor: 1 inHg = 0.003386 MPa
| Inch Hg (inHg) | Megapascal (MPa) | Context |
|---|---|---|
| 0.01 inHg | 3.386e-05 MPa | Near vacuum |
| 0.1 inHg | 0.0003386 MPa | Very low |
| 1 inHg | 0.003386 MPa | Low pressure |
| 10 inHg | 0.03386 MPa | ~10 inHg |
| 20 inHg | 0.06773 MPa | ~20 inHg |
| 25 inHg | 0.08466 MPa | Low weather |
| 28 inHg | 0.09482 MPa | Hurricane center |
| 29 inHg | 0.09821 MPa | Storm low |
| 29.92 inHg | 0.1013 MPa | 1 standard atm |
| 30 inHg | 0.1016 MPa | Slightly high |
| 31 inHg | 0.105 MPa | High pressure |
| 35 inHg | 0.1185 MPa | Very high |
| 50 inHg | 0.1693 MPa | ~1.67 atm |
| 100 inHg | 0.3386 MPa | ~3.34 atm |
| 1,000 inHg | 3.386 MPa | ~33.4 atm |
1 inHg = 0.003386 MPa. Memorize for instant estimates.
Use 0.0034 as a quick mental multiplier.
Multiply result by 295.3 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 megapascal (MPa) equals 1,000,000 pascals (1,000 kPa) and is the standard unit for high-pressure engineering applications including hydraulics, structural materials, and industrial processes.
Steel has a tensile strength of about 400–550 MPa; concrete compressive strength is typically 20–40 MPa. Hydraulic systems in heavy machinery operate at 20–35 MPa. Water jet cutting uses pressures up to 600 MPa.
Interesting fact: The deepest point in the ocean (Mariana Trench, ~11,000 m) has a pressure of about 110 MPa — over 1,000 times atmospheric pressure.
Converting inch hg to megapascal 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 = 0.01693 MPa and 10 inHg = 0.03386 MPa. For the reverse: 1 MPa = 295.3 inHg. The exact factor is 1 inHg = 0.003386 MPa.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.