Inch mercury to Pascal Converter
Enter the value that you want to convert inch mercury (inHg) to pascal (Pa) or pascal to inch mercury.Also written as INHG to PA conversion.
1 inch mercury = 3386.3800000 pascal
Formula: pascal = inch mercury value × 3386.3800000
INHG to PA — inch mercury to pascal
10 inch mercury = 33863.80000 pascal
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Converting Inch mercury to Pascal
What is Inch mercury?
Inch mercury (inHg) is a unit of pressure measurement. 1 inch mercury is equal to 3386.3800000 pascal.
About the Pascal
Pascal (Pa) is a unit of pressure measurement. 1 pascal is equal to 0.0002953 inch mercury.
Pressure Units Across Industries
Pressure measurements vary dramatically by industry. Meteorologists report in millibars or hectopascals, tire shops use PSI, scuba divers think in atmospheres or bar, vacuum engineers work in torr, and hydraulic systems specify in megapascals. A single industrial plant might encounter all these units across different equipment manuals, safety datasheets, and regulatory standards from different countries.
inch mercury to pascal metric conversion table
| 0.01 inHg | = | 33.86380 Pa |
| 0.1 inHg | = | 338.63800 Pa |
| 1 inHg | = | 3386.38000 Pa |
| 2 inHg | = | 6772.76000 Pa |
| 3 inHg | = | 10159.14000 Pa |
| 4 inHg | = | 13545.52000 Pa |
| 5 inHg | = | 16931.90000 Pa |
| 6 inHg | = | 20318.28000 Pa |
| 7 inHg | = | 23704.66000 Pa |
| 8 inHg | = | 27091.04000 Pa |
| 9 inHg | = | 30477.42000 Pa |
| 10 inHg | = | 33863.80000 Pa |
| 11 inHg | = | 37250.18000 Pa |
| 12 inHg | = | 40636.56000 Pa |
| 13 inHg | = | 44022.94000 Pa |
| 14 inHg | = | 47409.32000 Pa |
| 15 inHg | = | 50795.70000 Pa |
| 16 inHg | = | 54182.08000 Pa |
| 17 inHg | = | 57568.46000 Pa |
| 18 inHg | = | 60954.84000 Pa |
| 19 inHg | = | 64341.22000 Pa |
| 20 inHg | = | 67727.60000 Pa |
| 30 inHg | = | 101591.40000 Pa |
| 40 inHg | = | 135455.20000 Pa |
| 50 inHg | = | 169319.00000 Pa |
| 60 inHg | = | 203182.80000 Pa |
| 70 inHg | = | 237046.60000 Pa |
| 80 inHg | = | 270910.40000 Pa |
| 90 inHg | = | 304774.20000 Pa |
| 100 inHg | = | 338638.00000 Pa |
| 200 inHg | = | 677276.00000 Pa |
| 300 inHg | = | 1015914.00000 Pa |
| 400 inHg | = | 1354552.00000 Pa |
| 500 inHg | = | 1693190.00000 Pa |
| 600 inHg | = | 2031828.00000 Pa |
| 700 inHg | = | 2370466.00000 Pa |
| 800 inHg | = | 2709104.00000 Pa |
| 900 inHg | = | 3047742.00000 Pa |
| 1000 inHg | = | 3386380.00000 Pa |
How to Convert INHG to PA (Inch mercury to Pascal)?
We can convert inch mercury to pascal by using an example.
Example:
Convert 20 Inch mercury to Pascal?
We know 1 Inch mercury = 3386.3800000 pascal; 1 Pascal = 0.0002953 inch mercury.
20 inch mercury = ___Pa
20 × 3386.3800000 = 67727.60000 Pa (we know 1 inch mercury = 3386.3800000 pascal)
Answer:
20 inch mercury = 67727.60000 pascal
How to Convert Inches of Mercury to Pascal (Step-by-Step)
Converting inches of mercury (inHg) to pascals is needed when interfacing US barometric readings with SI-based atmospheric models. The conversion factor is 1 inHg = 3386.39 Pa (at 32°F / 0°C, the standard reference temperature).
- Write down the pressure value in inches of mercury (inHg).
- Multiply the inHg value by 3386.39.
- The result is the equivalent pressure in pascals (Pa).
- For quick estimation, multiply by 3386 or approximately 3400 (overshoots by 0.4%).
Common Inches of Mercury to Pascal Conversions
US barometric pressure readings converted to SI pascals for scientific applications.
| Inch mercury | Pascal |
|---|---|
| 25.00 inHg | 84,660 Pa |
| 28.00 inHg | 94,819 Pa |
| 29.00 inHg | 98,205 Pa |
| 29.92 inHg | 101,325 Pa |
| 30.00 inHg | 101,592 Pa |
| 30.50 inHg | 103,285 Pa |
| 31.00 inHg | 104,978 Pa |
Solved Examples: inHg to Pascal
Question 1: A US weather station reports barometric pressure of 30.12 inHg. Convert to pascals for a climate database.
Solution:
Pressure in Pa = Pressure in inHg × 3386.39
= 30.12 × 3386.39
= 101,998 Pa
Answer: 30.12 inHg = 101,998 Pa ≈ 102.0 kPa — slightly above standard atmospheric pressure.
Question 2: During a hurricane, central pressure drops to 27.50 inHg. Express in pascals.
Solution:
Pressure in Pa = 27.50 × 3386.39
= 93,126 Pa
Answer: 27.50 inHg = 93,126 Pa — a Category 3-4 hurricane intensity.
Question 3: An HVAC vacuum system pulls 5 inHg of vacuum. What is the absolute pressure in Pa if atmospheric is 29.92 inHg?
Solution:
Absolute pressure = 29.92 - 5 = 24.92 inHg
In Pa = 24.92 × 3386.39 = 84,388 Pa
Answer: 5 inHg vacuum = 24.92 inHg absolute = 84,388 Pa absolute.
Practice Questions: inHg to Pascal
Try solving these on your own to test your understanding:
- Convert 29.92 inHg to Pa. (Answer: 101,325 Pa)
- A barometer reads 30.45 inHg. Express in Pa. (Answer: 103,113 Pa)
- Convert 28.50 inHg to Pa. (Answer: 96,512 Pa)
- A vacuum gauge shows 10 inHg vacuum (19.92 inHg absolute). What is the absolute pressure in Pa? (Answer: 67,457 Pa)
- Convert 31.10 inHg to Pa. (Answer: 105,317 Pa)
US Barometric Pressure Reporting in inHg
The United States is one of the few countries that still reports surface barometric pressure in inches of mercury. TV weather broadcasts, aviation ATIS, and consumer barometers typically display inHg. Standard sea-level pressure is 29.92 inHg (101,325 Pa). Values below 29.50 inHg suggest approaching storms; above 30.50 inHg indicates settled weather. When this data feeds into numerical weather prediction models (which use Pa internally), the ×3386.39 conversion is applied at the data ingestion stage.
HVAC Vacuum Measurement in Inches of Mercury
HVAC technicians measure vacuum in "inches of mercury" when evacuating refrigeration systems. A proper evacuation requires pulling below 500 microns (0.5 mmHg ≈ 0.02 inHg), but gauges often read in inHg for the initial rough vacuum stage. An HVAC manifold showing 28 inHg vacuum means the system is at 29.92 - 28 = 1.92 inHg absolute = 6,502 Pa absolute. Converting to Pa helps specify vacuum pump performance in SI units.
Aviation Altimeter Setting and Pressure Altitude
US pilots receive altimeter settings in inHg from ATIS/AWOS broadcasts. Standard setting is 29.92 inHg; each 0.01 inHg difference from standard equals approximately 10 feet of altitude error. In SI terms, 0.01 inHg = 33.86 Pa. International aviation (ICAO) uses hectopascals (hPa = Pa/100), so US inHg must be converted: 29.92 inHg = 1013.25 hPa. Pilots flying internationally must understand both systems.
Key Takeaways
- Multiply inHg by 3386.39 to get pascals.
- Standard atmosphere: 29.92 inHg = 101,325 Pa exactly.
- US weather uses inHg; scientific models use Pa (or hPa).
- Quick estimate: inHg × 3400 ≈ Pa (overshoots ~0.4%).
- HVAC vacuum in inHg converts to Pa for pump specifications.
- Aviation: 0.01 inHg ≈ 33.86 Pa ≈ 10 feet of altitude.
Inch mercury to Pascal Conversion Formula
pascal = inch mercury × 3386.3800000
1 inch mercury = 3386.3800000 pascal
1 pascal = 0.0002953 inch mercury
Reverse: inch mercury = pascal × 0.0002953
Frequently Asked Questions
How many pascal are in 1 inch mercury?
There are 3386.3800000 pascal in 1 inch mercury. To convert inch mercury to pascal, multiply the value by 3386.3800000.
How do I convert inch mercury to pascal?
Multiply your inch mercury value by 3386.3800000 to get the equivalent in pascal. For example, 5 inch mercury = 5 × 3386.3800000 = 16931.90000 pascal.
How do I convert pascal to inch mercury?
Multiply your pascal value by 0.0002953 to get the equivalent in inch mercury. Alternatively, divide by 3386.3800000.
What is 10 inch mercury in pascal?
10 inch mercury is equal to 33863.80000 pascal.
What is 100 inch mercury in pascal?
100 inch mercury is equal to 338638.00000 pascal.