Convert Inches of Mercury to Megapascals
Instantly convert Inches of Mercury (inHg) to Megapascals (MPa) with our free online calculator.
Formula: inHg to MPa — multiply by 0.00338639
Reference Table
| Inches of Mercury (inHg) | Megapascals (MPa) |
|---|---|
| 1 | 0.00338639 |
| 5 | 0.016932 |
| 10 | 0.0338639 |
| 25 | 0.0846598 |
| 50 | 0.16932 |
| 100 | 0.338639 |
How to Convert Inches of Mercury to Megapascals
Formula
To convert Inches of Mercury (inHg) to Megapascals (MPa): multiply by 0.00338639
Step-by-Step
- Start with your value in Inches of Mercury (inHg).
- Multiply by 0.00338639 to perform the conversion.
- The result is your value expressed in Megapascals (MPa).
Conversion Factor
1 inHg = 0.00338639 MPa
Reverse Factor
1 MPa = 295.3 inHg
Worked Example
Convert 25 Inches of Mercury to Megapascals: 25 inHg = 0.0846598 MPa
About Inch of Mercury (inHg)
A pressure unit defined as the pressure exerted by a 1-inch column of mercury at the standard density of mercury (0 °C) and the standard acceleration of gravity (≈ 3,386.389 Pa per NIST SP 811). Inches of mercury are the primary unit in US aviation for altimeter settings (the QNH datum is reported in inHg in METAR weather observations — "Altimeter 30.12 inHg" means 30.12 inHg corrected to mean sea level), US barometric weather reporting on consumer indoor weather stations and TV weather graphics, HVAC and refrigeration duct/return static pressure (often quoted as fractions of an inHg, e.g., 0.25 inHg = ~62 Pa), and some legacy automotive vacuum gauges measuring intake-manifold vacuum below atmospheric (a healthy engine reads ~18-22 inHg of vacuum at idle). Standard sea-level atmospheric pressure is 29.92 inHg = 1013.25 hPa = 101.325 kPa.
About Megapascal (MPa)
A metric unit of pressure equal to exactly 1,000,000 pascals (1,000 kPa), or 10 bar. Megapascals are the universal SI unit for material strength reporting in structural and mechanical engineering: concrete compressive strength (typically 20-60 MPa per ACI 318 / Eurocode 2, with ultra-high-performance concrete reaching 150-200 MPa), structural-steel yield stress (250 MPa for S275 / A36, 355 MPa for S355, up to 690 MPa for HSLA grades), aluminum tensile (6061-T6 ~310 MPa), and the fracture toughness of ceramics and polymers reported as MPa·m^½ in materials databases. Mechanical-engineering finite-element solvers (Abaqus, ANSYS, Nastran), pressure-vessel codes (ASME BPVC Section VIII, PD 5500, EN 13445), hydraulic system specifications above ~70 bar, and the civil-engineering concrete mix specs all use MPa as the working pressure/stress unit. Common conversions: 1 MPa = 10 bar = 145.04 psi = 9.869 atm.
Quick Facts
- 1 Inch of Mercury equals 0.00338639 Megapascals
- 1 Megapascal equals 295.3 Inches of Mercury
- Inch of Mercury is a unit of pressure
- Megapascal is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
- The Inch of Mercury belongs to the imperial system
- The Megapascal belongs to the metric system
Common Inch of Mercury to Megapascal Conversions
| Inches of Mercury (inHg) | Megapascals (MPa) |
|---|---|
| 0.1 | 0.000338639 |
| 0.5 | 0.00169319 |
| 1 | 0.00338639 |
| 2 | 0.00677278 |
| 5 | 0.016932 |
| 10 | 0.0338639 |
| 14.696 | 0.0497664 |
| 15 | 0.0507958 |
| 20 | 0.0677278 |
| 25 | 0.0846598 |
| 50 | 0.16932 |
| 100 | 0.338639 |
| 150 | 0.507958 |
| 200 | 0.677278 |
| 500 | 1.6932 |
| 1000 | 3.38639 |
Understanding Inches of Mercury
The Inch of Mercury (symbol: inHg) is a unit of pressure. A pressure unit defined as the pressure exerted by a 1-inch column of mercury at the standard density of mercury (0 °C) and the standard acceleration of gravity (≈ 3,386.389 Pa per NIST SP 811). Inches of mercury are the primary unit in US aviation for altimeter settings (the QNH datum is reported in inHg in METAR weather observations — "Altimeter 30.12 inHg" means 30.12 inHg corrected to mean sea level), US barometric weather reporting on consumer indoor weather stations and TV weather graphics, HVAC and refrigeration duct/return static pressure (often quoted as fractions of an inHg, e.g., 0.25 inHg = ~62 Pa), and some legacy automotive vacuum gauges measuring intake-manifold vacuum below atmospheric (a healthy engine reads ~18-22 inHg of vacuum at idle). Standard sea-level atmospheric pressure is 29.92 inHg = 1013.25 hPa = 101.325 kPa.
It belongs to the imperial measurement system.
Inches of Mercury are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Understanding Megapascals
The Megapascal (symbol: MPa) is a unit of pressure. A metric unit of pressure equal to exactly 1,000,000 pascals (1,000 kPa), or 10 bar. Megapascals are the universal SI unit for material strength reporting in structural and mechanical engineering: concrete compressive strength (typically 20-60 MPa per ACI 318 / Eurocode 2, with ultra-high-performance concrete reaching 150-200 MPa), structural-steel yield stress (250 MPa for S275 / A36, 355 MPa for S355, up to 690 MPa for HSLA grades), aluminum tensile (6061-T6 ~310 MPa), and the fracture toughness of ceramics and polymers reported as MPa·m^½ in materials databases. Mechanical-engineering finite-element solvers (Abaqus, ANSYS, Nastran), pressure-vessel codes (ASME BPVC Section VIII, PD 5500, EN 13445), hydraulic system specifications above ~70 bar, and the civil-engineering concrete mix specs all use MPa as the working pressure/stress unit. Common conversions: 1 MPa = 10 bar = 145.04 psi = 9.869 atm.
It belongs to the metric measurement system.
Megapascals are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Why Convert Inches of Mercury to Megapascals?
Engineers, mechanics, and scientists frequently need to convert pressure between Inches of Mercury and Megapascals when working with different measurement standards. Tire pressure, blood pressure readings, weather barometric measurements, and industrial process specifications may all use different pressure units depending on the region or discipline. Reliable conversion prevents equipment misuse and ensures safety.
Frequently Asked Questions
How do I convert Inches of Mercury to Megapascals?
A pressure unit defined as the pressure exerted by a 1-inch column of mercury at the standard density of mercury (0 °C) and the standard acceleration of gravity (≈ 3,386. To convert Inches of Mercury to Megapascals, multiply by 0.00338639. For example, 25 inHg equals 0.0846598 MPa.
How many Megapascals are in 1 Inch of Mercury?
There are 0.00338639 Megapascals in 1 Inch of Mercury.
How many Inches of Mercury are in 1 Megapascal?
There are 295.3 Inches of Mercury in 1 Megapascal.
What is the formula for Inch of Mercury to Megapascal conversion?
The formula is: multiply by 0.00338639. This means 1 inHg = 0.00338639 MPa.
Is a Inch of Mercury bigger than a Megapascal?
Yes. One Inch of Mercury is larger than one Megapascal because 1 inHg equals 0.00338639 MPa, which is less than 1.
When do you need to convert between Inches of Mercury and Megapascals?
A metric unit of pressure equal to exactly 1,000,000 pascals (1,000 kPa), or 10 bar. Inch of Mercury and Megapascal are both pressure units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.