Convert Inches of Mercury to Gigapascals
Instantly convert Inches of Mercury (inHg) to Gigapascals (GPa) with our free online calculator.
Formula: inHg to GPa — multiply by 3.3864e-6
Reference Table
| Inches of Mercury (inHg) | Gigapascals (GPa) |
|---|---|
| 1 | 0.00000338639 |
| 5 | 0.0000169319 |
| 10 | 0.0000338639 |
| 25 | 0.0000846598 |
| 50 | 0.00016932 |
| 100 | 0.000338639 |
How to Convert Inches of Mercury to Gigapascals
Formula
To convert Inches of Mercury (inHg) to Gigapascals (GPa): multiply by 3.3864e-6
Step-by-Step
- Start with your value in Inches of Mercury (inHg).
- Multiply by 3.3864e-6 to perform the conversion.
- The result is your value expressed in Gigapascals (GPa).
Conversion Factor
1 inHg = 0.00000338639 GPa
Reverse Factor
1 GPa = 295300 inHg
Worked Example
Convert 25 Inches of Mercury to Gigapascals: 25 inHg = 0.0000846598 GPa
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 Gigapascal (GPa)
A metric unit of pressure equal to exactly 1,000,000,000 pascals (1,000 MPa). Gigapascals are the standard unit for reporting elastic-modulus and material-stiffness properties — Young's modulus of structural steel is ~200-210 GPa, aluminum alloys ~69-72 GPa, titanium ~110 GPa, concrete ~25-35 GPa, single-crystal diamond ~1,050-1,200 GPa, and CFRP composite ~150-230 GPa (longitudinal). MatWeb, NIST's MMP database, and the ASM Handbook tabulate elastic constants in GPa. GPa is also the working unit for ultra-high-pressure scientific experiments: diamond-anvil cell measurements (currently extending past 1,000 GPa = 1 TPa for studies of metallic hydrogen and Earth-core conditions), shock-wave equation-of-state research at national labs (LANL, LLNL, Sandia), and geophysics interior models — Earth's outer core lies between roughly 135 and 330 GPa. 1 GPa = 10,000 bar = 145,038 psi.
Quick Facts
- 1 Inch of Mercury equals 0.00000338639 Gigapascals
- 1 Gigapascal equals 295300 Inches of Mercury
- Inch of Mercury is a unit of pressure
- Gigapascal 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 Gigapascal belongs to the metric system
Common Inch of Mercury to Gigapascal Conversions
| Inches of Mercury (inHg) | Gigapascals (GPa) |
|---|---|
| 0.1 | 3.386390e-7 |
| 0.5 | 0.0000016932 |
| 1 | 0.00000338639 |
| 2 | 0.00000677278 |
| 5 | 0.0000169319 |
| 10 | 0.0000338639 |
| 14.696 | 0.0000497664 |
| 15 | 0.0000507958 |
| 20 | 0.0000677278 |
| 25 | 0.0000846598 |
| 50 | 0.00016932 |
| 100 | 0.000338639 |
| 150 | 0.000507959 |
| 200 | 0.000677278 |
| 500 | 0.00169319 |
| 1000 | 0.00338639 |
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 Gigapascals
The Gigapascal (symbol: GPa) is a unit of pressure. A metric unit of pressure equal to exactly 1,000,000,000 pascals (1,000 MPa). Gigapascals are the standard unit for reporting elastic-modulus and material-stiffness properties — Young's modulus of structural steel is ~200-210 GPa, aluminum alloys ~69-72 GPa, titanium ~110 GPa, concrete ~25-35 GPa, single-crystal diamond ~1,050-1,200 GPa, and CFRP composite ~150-230 GPa (longitudinal). MatWeb, NIST's MMP database, and the ASM Handbook tabulate elastic constants in GPa. GPa is also the working unit for ultra-high-pressure scientific experiments: diamond-anvil cell measurements (currently extending past 1,000 GPa = 1 TPa for studies of metallic hydrogen and Earth-core conditions), shock-wave equation-of-state research at national labs (LANL, LLNL, Sandia), and geophysics interior models — Earth's outer core lies between roughly 135 and 330 GPa. 1 GPa = 10,000 bar = 145,038 psi.
It belongs to the metric measurement system.
Gigapascals are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Why Convert Inches of Mercury to Gigapascals?
Engineers, mechanics, and scientists frequently need to convert pressure between Inches of Mercury and Gigapascals 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 Gigapascals?
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 Gigapascals, multiply by 3.3864e-6. For example, 25 inHg equals 0.0000846598 GPa.
How many Gigapascals are in 1 Inch of Mercury?
There are 0.00000338639 Gigapascals in 1 Inch of Mercury.
How many Inches of Mercury are in 1 Gigapascal?
There are 295300 Inches of Mercury in 1 Gigapascal.
What is the formula for Inch of Mercury to Gigapascal conversion?
The formula is: multiply by 3.3864e-6. This means 1 inHg = 0.00000338639 GPa.
Is a Inch of Mercury bigger than a Gigapascal?
Yes. One Inch of Mercury is larger than one Gigapascal because 1 inHg equals 0.00000338639 GPa, which is less than 1.
When do you need to convert between Inches of Mercury and Gigapascals?
A metric unit of pressure equal to exactly 1,000,000,000 pascals (1,000 MPa). Inch of Mercury and Gigapascal 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.