Convert Pascals to Inches of Mercury
Instantly convert Pascals (Pa) to Inches of Mercury (inHg) with our free online calculator.
Formula: Pa to inHg — multiply by 2.9530e-4
Reference Table
| Pascals (Pa) | Inches of Mercury (inHg) |
|---|---|
| 1 | 0.0002953 |
| 5 | 0.0014765 |
| 10 | 0.002953 |
| 25 | 0.00738249 |
| 50 | 0.014765 |
| 100 | 0.02953 |
How to Convert Pascals to Inches of Mercury
Formula
To convert Pascals (Pa) to Inches of Mercury (inHg): multiply by 2.9530e-4
Step-by-Step
- Start with your value in Pascals (Pa).
- Multiply by 2.9530e-4 to perform the conversion.
- The result is your value expressed in Inches of Mercury (inHg).
Conversion Factor
1 Pa = 0.0002953 inHg
Reverse Factor
1 inHg = 3386.39 Pa
Worked Example
Convert 25 Pascals to Inches of Mercury: 25 Pa = 0.00738249 inHg
About Pascal (Pa)
The SI derived unit of pressure (and stress), formally defined as one newton per square meter (N/m²) by ISO 80000-4. Named for 17th-century French mathematician Blaise Pascal, whose 1647-48 Puy-de-Dôme experiment established that atmospheric pressure decreases with altitude. The pascal is a small unit — standard sea-level atmospheric pressure is exactly 101,325 Pa per the BIPM SI Brochure — so working engineering and meteorology use multiples: kilopascals (kPa) for everyday gauge pressures, megapascals (MPa) for material strength, hectopascals (hPa) for barometric readings (1 kPa = 10 hPa). The pascal is the universal SI reference for pressure across scientific publication (Physical Review, J. Fluid Mechanics), thermodynamic state tables (NIST REFPROP), and international engineering codes (ASME, EN, JIS). Converting Pa to psi is a divide-by-6894.76; Pa to bar is divide-by-100,000.
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.
Quick Facts
- 1 Pascal equals 0.0002953 Inches of Mercury
- 1 Inch of Mercury equals 3386.39 Pascals
- Pascal is a unit of pressure
- Inch of Mercury is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
- The Pascal belongs to the metric system
- The Inch of Mercury belongs to the imperial system
Common Pascal to Inch of Mercury Conversions
| Pascals (Pa) | Inches of Mercury (inHg) |
|---|---|
| 0.1 | 0.00002953 |
| 0.5 | 0.00014765 |
| 1 | 0.0002953 |
| 2 | 0.000590599 |
| 5 | 0.0014765 |
| 10 | 0.002953 |
| 14.696 | 0.00433972 |
| 15 | 0.0044295 |
| 20 | 0.00590599 |
| 25 | 0.00738249 |
| 50 | 0.014765 |
| 100 | 0.02953 |
| 150 | 0.044295 |
| 200 | 0.0590599 |
| 500 | 0.14765 |
| 1000 | 0.2953 |
Understanding Pascals
The Pascal (symbol: Pa) is a unit of pressure. The SI derived unit of pressure (and stress), formally defined as one newton per square meter (N/m²) by ISO 80000-4. Named for 17th-century French mathematician Blaise Pascal, whose 1647-48 Puy-de-Dôme experiment established that atmospheric pressure decreases with altitude. The pascal is a small unit — standard sea-level atmospheric pressure is exactly 101,325 Pa per the BIPM SI Brochure — so working engineering and meteorology use multiples: kilopascals (kPa) for everyday gauge pressures, megapascals (MPa) for material strength, hectopascals (hPa) for barometric readings (1 kPa = 10 hPa). The pascal is the universal SI reference for pressure across scientific publication (Physical Review, J. Fluid Mechanics), thermodynamic state tables (NIST REFPROP), and international engineering codes (ASME, EN, JIS). Converting Pa to psi is a divide-by-6894.76; Pa to bar is divide-by-100,000.
It belongs to the metric measurement system.
Pascals are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
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.
Why Convert Pascals to Inches of Mercury?
Engineers, mechanics, and scientists frequently need to convert pressure between Pascals and Inches of Mercury 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 Pascals to Inches of Mercury?
The SI derived unit of pressure (and stress), formally defined as one newton per square meter (N/m²) by ISO 80000-4. To convert Pascals to Inches of Mercury, multiply by 2.9530e-4. For example, 25 Pa equals 0.00738249 inHg.
How many Inches of Mercury are in 1 Pascal?
There are 0.0002953 Inches of Mercury in 1 Pascal.
How many Pascals are in 1 Inch of Mercury?
There are 3386.39 Pascals in 1 Inch of Mercury.
What is the formula for Pascal to Inch of Mercury conversion?
The formula is: multiply by 2.9530e-4. This means 1 Pa = 0.0002953 inHg.
Is a Pascal bigger than a Inch of Mercury?
Yes. One Pascal is larger than one Inch of Mercury because 1 Pa equals 0.0002953 inHg, which is less than 1.
When do you need to convert between Pascals and Inches of Mercury?
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. Pascal and Inch of Mercury 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.