Inches of mercury (inHg) to Megapascals (MPa) Conversion
Inches of mercury
The inch of mercury (inHg) is a unit of pressure equal to the pressure exerted by a column of mercury 1 inch (25.4 mm) high — approximately 3,386.39 Pa or 0.0334 atm. It is used in US aviation for altimeter settings (standard pressure is 29.92 inHg) and in US weather reports for barometric pressure. Pilots set their altimeters in inHg based on local barometric pressure to ensure accurate altitude readings.
Megapascals
The megapascal (MPa) is a unit of pressure equal to exactly 1,000,000 pascals (10⁶ Pa) and is the standard unit for expressing material strength, hydraulic system pressure, and structural loading in engineering. The tensile strength of structural steel is approximately 400–600 MPa; high-strength carbon fibre composites can exceed 3,500 MPa. Hydraulic systems in heavy machinery operate at 20–70 MPa. In geology, lithostatic pressure in the Earth's crust is measured in MPa and GPa.
| Inches of mercury (inHg) | Megapascals (MPa) |
|---|---|
| 0.1 inHg | 0.000339 MPa |
| 1 inHg | 0.00339 MPa |
| 2 inHg | 0.00677 MPa |
| 3 inHg | 0.0102 MPa |
| 5 inHg | 0.0169 MPa |
| 10 inHg | 0.0339 MPa |
| 20 inHg | 0.0677 MPa |
| 30 inHg | 0.1016 MPa |
| 50 inHg | 0.1693 MPa |
| 100 inHg | 0.3386 MPa |
| 1000 inHg | 3.3864 MPa |
Frequently Asked Questions (FAQ)
How many megapascals are in 1 inches of mercury?
1 inches of mercury (inHg) is exactly 0.003386 megapascals (MPa).
How do I convert inches of mercury to megapascals?
Multiply the value in inches of mercury by 0.003386 to get the result in megapascals. Or use the converter above — type any number and see the result instantly.