Convert Megapascals to Inches of Mercury
1 megapascal (MPa) equals 295.299833 inches of mercury (inHg).
1 MPa = 295.299833 inHg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk megapascal to inch of mercury converter to paste a column from Excel.
How to Convert Megapascal to Inch of Mercury
- 1 MPa = 295.299833 inHg
- 1 inHg = 0.00338638864 MPa
- Example: convert 15 MPa to inHg: 15 MPa = 15 × 295.299833 inHg = 4429.497495 inHg
Reference conditions. inHg: Conventional mercury column: ρ = 13 595.1 kg/m³ and gₙ = 9.80665 m/s² (≈ mercury at 0 °C / 32 °F).
Formula
inHg = MPa × 295.2998330101
Derivation from SI units:
- 1 MPa = 10⁶ Pa = 1 N/mm²
- 1 inHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.0254 m = 3386.388640341 Pa
- 1 MPa = 1000000 Pa ÷ 3386.388640341 Pa per inHg = 295.2998330101 inHg
Both units are defined exactly, so the factor is exact. Megapascal definition: megapascal; Inch of Mercury definition: inch of mercury.
Worked examples
- A reading of 2 MPa converts to 590.599666 inHg.
2 MPa × 295.299833 = 590.599666 inHg - A value of 30 MPa is 8858.99499 inHg.
30 MPa × 295.299833 = 8858.99499 inHg
Megapascal to Inch of Mercury conversion table
| Megapascals (MPa) | Inches of Mercury (inHg) |
|---|---|
| 0.01 MPa | 2.95299833 inHg |
| 0.05 MPa | 14.76499165 inHg |
| 0.1 MPa | 29.5299833 inHg |
| 0.2 MPa | 59.0599666 inHg |
| 0.5 MPa | 147.6499165 inHg |
| 0.7 MPa | 206.7098831 inHg |
| 1 MPa | 295.299833 inHg |
| 1.5 MPa | 442.9497495 inHg |
| 2 MPa | 590.599666 inHg |
| 2.5 MPa | 738.2495825 inHg |
| 5 MPa | 1476.499165 inHg |
| 7 MPa | 2067.098831 inHg |
| 10 MPa | 2952.99833 inHg |
| 15 MPa | 4429.497495 inHg |
| 20 MPa | 5905.99666 inHg |
| 25 MPa | 7382.495825 inHg |
| 30 MPa | 8858.99499 inHg |
| 40 MPa | 11811.99332 inHg |
| 50 MPa | 14764.99165 inHg |
| 70 MPa | 20670.98831 inHg |
| 100 MPa | 29529.9833 inHg |
| 200 MPa | 59059.9666 inHg |
| 250 MPa | 73824.95825 inHg |
| 355 MPa | 104831.4407 inHg |
| 500 MPa | 147649.9165 inHg |
Where it's used
Megapascals are used for concrete compressive strength (typically 20–50 MPa), while inches of mercury appear in aircraft altimeter settings (standard 29.92 inHg). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Megapascal to other pressure units
| Conversion | 1 MPa equals |
|---|---|
| megapascal to pascal | 1000000 Pa |
| megapascal to kilopascal | 1000 kPa |
| megapascal to psi | 145.0377377 psi |
| megapascal to bar | 10 bar |
| megapascal to millibar | 10000 mbar |
| megapascal to decibar | 100 dbar |
| megapascal to torr | 7500.616827 Torr |
| megapascal to millimeter of mercury | 7500.615758 mmHg |
| megapascal to millimeter of water | 101971.6213 mmH₂O |
| megapascal to centimeter of water | 10197.16213 cmH₂O |
| megapascal to inch of water | 4014.63076 inH₂O |
| megapascal to inch of water (60 °F) | 4018.64652 inH₂O (60 °F) |
| megapascal to inch of mercury | 295.299833 inHg |
| megapascal to atmosphere | 9.869232667 atm |
| megapascal to barye | 10000000 Ba |
Frequently asked questions
How many inches of mercury are in 1 megapascal?
1 MPa = 295.299833 inHg.
How do I convert megapascals to inches of mercury?
Multiply the value in MPa by 295.299833. For example, 15 MPa × 295.299833 = 4429.497495 inHg.
Is the MPa to inHg conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "inch of mercury, conventional (inHg)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Megapascals to Inches of Mercury. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/megapascal-to-inch-of-mercury/
IEEE
Scientific Converters, "Convert Megapascals to Inches of Mercury," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/megapascal-to-inch-of-mercury/