Convert Megapascal to Inch of Mercury (MPa → inHg)
The megapascal is the engineering high-pressure unit, used in hydraulics, materials testing, and construction.
Megapascal to Inch of Mercury Conversion Table
10 common values| Megapascal | Inch of Mercury |
|---|---|
| 1 MPa | 295.2998 inHg |
| 5 MPa | 1,476.499 inHg |
| 10 MPa | 2,952.998 inHg |
| 25 MPa | 7,382.495 inHg |
| 50 MPa | 14,764.99 inHg |
| 100 MPa | 29,529.98 inHg |
| 200 MPa | 59,059.96 inHg |
| 500 MPa | 147,649.9 inHg |
| 1,000 MPa | 295,299.8 inHg |
| 5,000 MPa | 1,476,499 inHg |
How to Convert Megapascal to Inch of Mercury Manually
Step by StepConverting megapascals to inches of mercury is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in megapascalsStart with the number of megapascals (MPa) you want to convert.
- 2Multiply by 295.2998The conversion factor from MPa to inHg is 295.2998. Multiply your value by this number.
- 3Read the result in inches of mercuryThe result is your value in inches of mercury (inHg).
Formula
Multiply the value in megapascals by 295.2998. For the reverse direction, multiply by 0.003386.
inHg = MPa × 295.2998MPa = inHg × 0.003386Tips
Use these in everyday conversions- 1 MPa = 10 bar = 145 psi.
- N/mm² = MPa (same unit, different notation).
- Use MPa for material science; bar for fluid dynamics.
Common Mistakes
Avoid these- Confusing MPa with MW or MJ.
- Using 1 MPa = 100 bar — that's incorrect; it's 10 bar.
- Mixing MPa and kPa without conversion in mixed docs.
About Megapascal and Inch of Mercury
What is the Megapascal?
The megapascal equals 1,000,000 pascals (or 10 bar) and is the engineering high-pressure unit used in hydraulics, materials testing, and construction. Concrete compressive strength is rated in MPa (typical residential concrete is 20–35 MPa, structural concrete 35–70 MPa, high-strength up to 140 MPa), and steel yield strengths are 250–700 MPa for structural grades. Hydraulic systems operate at 10–70 MPa, and high-pressure-water-jet cutting reaches 400 MPa. The megapascal is dimensionally identical to N/mm² (newtons per square millimeter), making it natural for engineering calculations involving small areas. Earth's mantle pressure reaches gigapascals (1 GPa = 1,000 MPa). The MPa relates to the pascal (10⁶ Pa = 1 MPa), the bar (10 bar = 1 MPa), the psi (1 MPa ≈ 145.04 psi), and the atmosphere (1 MPa ≈ 9.87 atm). It is the standard unit in modern engineering specifications worldwide.
- Hydraulic system pressures
- Concrete and steel strength specifications
- High-pressure industrial processes
Concrete compressive strength: 20–60 MPa. Hydraulic press: 30–70 MPa. Steel yield strength: 250+ MPa.
What is the Inch of Mercury?
The inch of mercury equals exactly 25.4 mmHg (or about 3,386.4 pascals) and is the American aviation standard for altimeter settings and historic barometer readings. Pilots set their altimeters to the local atmospheric pressure in inHg before takeoff and landing — standard 'sea-level pressure' is 29.92 inHg. American weather reports historically used inHg before transitioning to millibars/hPa, and home barometers in the US still display inHg. The unit relates to the mmHg (25.4 mmHg = 1 inHg), the millibar (1 inHg ≈ 33.864 mbar), the kilopascal (1 inHg ≈ 3.386 kPa), and the psi (1 inHg ≈ 0.491 psi). Aviation's continued use of inHg in the United States reflects regulatory tradition rather than scientific advantage; international ATC outside the US uses hectopascals.
- US aviation altimeter QNH settings
- US residential barometers
- US weather forecasts (older)
Sea-level standard: 29.92 inHg. Mountain pass at 3000 m: ~21 inHg. US aviation QNH given in inHg.