Inch mercury to Bar Converter
Enter the value that you want to convert inch mercury (inHg) to bar or bar to inch mercury.
1 inch mercury = 0.0338638 bar
Formula: bar = inch mercury value × 0.0338638
inch mercury to bar
10 inch mercury = 0.33864 bar
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Converting Inch mercury to Bar
What is Inch mercury?
Inch mercury (inHg) is a unit of pressure measurement. 1 inch mercury is equal to 0.0338638 bar.
The Bar in Engineering
Bar (bar) is a unit of pressure measurement. 1 bar is equal to 29.5300586 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 bar metric conversion table
| 0.01 inHg | = | 0.00034 bar |
| 0.1 inHg | = | 0.00339 bar |
| 1 inHg | = | 0.03386 bar |
| 2 inHg | = | 0.06773 bar |
| 3 inHg | = | 0.10159 bar |
| 4 inHg | = | 0.13546 bar |
| 5 inHg | = | 0.16932 bar |
| 6 inHg | = | 0.20318 bar |
| 7 inHg | = | 0.23705 bar |
| 8 inHg | = | 0.27091 bar |
| 9 inHg | = | 0.30477 bar |
| 10 inHg | = | 0.33864 bar |
| 11 inHg | = | 0.37250 bar |
| 12 inHg | = | 0.40637 bar |
| 13 inHg | = | 0.44023 bar |
| 14 inHg | = | 0.47409 bar |
| 15 inHg | = | 0.50796 bar |
| 16 inHg | = | 0.54182 bar |
| 17 inHg | = | 0.57568 bar |
| 18 inHg | = | 0.60955 bar |
| 19 inHg | = | 0.64341 bar |
| 20 inHg | = | 0.67728 bar |
| 30 inHg | = | 1.01591 bar |
| 40 inHg | = | 1.35455 bar |
| 50 inHg | = | 1.69319 bar |
| 60 inHg | = | 2.03183 bar |
| 70 inHg | = | 2.37047 bar |
| 80 inHg | = | 2.70910 bar |
| 90 inHg | = | 3.04774 bar |
| 100 inHg | = | 3.38638 bar |
| 200 inHg | = | 6.77276 bar |
| 300 inHg | = | 10.15914 bar |
| 400 inHg | = | 13.54552 bar |
| 500 inHg | = | 16.93190 bar |
| 600 inHg | = | 20.31828 bar |
| 700 inHg | = | 23.70466 bar |
| 800 inHg | = | 27.09104 bar |
| 900 inHg | = | 30.47742 bar |
| 1000 inHg | = | 33.86380 bar |
How to Convert Inch mercury to Bar?
We can convert inch mercury to bar by using an example.
Example:
Convert 20 Inch mercury to Bar?
We know 1 Inch mercury = 0.0338638 bar; 1 Bar = 29.5300586 inch mercury.
20 inch mercury = ___bar
20 × 0.0338638 = 0.67728 bar (we know 1 inch mercury = 0.0338638 bar)
Answer:
20 inch mercury = 0.67728 bar
How to Convert Inches of Mercury to Bar (Step-by-Step)
Converting inches of mercury (inHg) to bar links US barometric measurements with the European industrial pressure standard. The conversion factor is 1 inHg = 0.033864 bar.
- Write down the pressure value in inches of mercury (inHg).
- Multiply the inHg value by 0.033864.
- The result is the equivalent pressure in bar.
- For quick estimation, multiply by 0.034 (overshoots by 0.4%).
Common Inches of Mercury to Bar Conversions
US barometric and vacuum readings converted to industrial bar scale.
| Inch mercury | Bar |
|---|---|
| 1 inHg | 0.03386 bar |
| 10 inHg | 0.3386 bar |
| 20 inHg | 0.6773 bar |
| 25 inHg | 0.8466 bar |
| 29.92 inHg | 1.01325 bar |
| 30.50 inHg | 1.03285 bar |
| 35 inHg | 1.1852 bar |
Solved Examples: inHg to Bar
Question 1: A vacuum forming machine operates at 22 inHg vacuum. What is the absolute pressure in bar?
Solution:
Absolute pressure = 29.92 - 22 = 7.92 inHg
Pressure in bar = 7.92 × 0.033864
= 0.2682 bar
Answer: 22 inHg vacuum = 7.92 inHg absolute = 0.268 bar absolute.
Question 2: A barometer reads 30.25 inHg. Express in bar for comparison with a European weather service.
Solution:
Pressure in bar = 30.25 × 0.033864
= 1.0244 bar
Answer: 30.25 inHg = 1.024 bar — a fair-weather high-pressure reading.
Question 3: An engine intake manifold shows 15 inHg vacuum during idle. What is the manifold absolute pressure in bar?
Solution:
Absolute pressure = 29.92 - 15 = 14.92 inHg
In bar = 14.92 × 0.033864 = 0.5053 bar
Answer: 15 inHg vacuum = 0.505 bar absolute — typical gasoline engine idle MAP.
Practice Questions: inHg to Bar
Try solving these on your own to test your understanding:
- Convert 29.92 inHg to bar. (Answer: 1.01325 bar)
- A vacuum pump pulls 25 inHg. What is absolute pressure in bar? (Answer: 0.1668 bar)
- Convert 30.80 inHg to bar. (Answer: 1.0430 bar)
- An engine at 20 inHg vacuum has what MAP in bar? (Answer: 0.3362 bar)
- Convert 28.00 inHg to bar. (Answer: 0.9482 bar)
Automotive MAP Sensors: inHg to Bar
Manifold Absolute Pressure (MAP) sensors in vehicles report in either inHg vacuum, kPa absolute, or bar absolute depending on the manufacturer. US-market vehicles often show vacuum in inHg on scan tools: idle = 18-22 inHg vacuum (0.27-0.40 bar absolute), wide-open throttle = 0 inHg vacuum (1.01 bar absolute), boosted turbo = positive pressure. European OBD data typically reports MAP in bar or kPa. Converting between them is essential for cross-platform diagnostic work.
Industrial Vacuum Systems: inHg Gauge to Bar Absolute
North American vacuum systems often specify vacuum level in "inches of mercury vacuum" — measured as a negative gauge relative to atmosphere. To convert to bar absolute: (1) subtract the vacuum inHg from 29.92 to get absolute inHg, (2) multiply by 0.033864 to get bar. Example: 28 inHg vacuum = 1.92 inHg absolute = 0.065 bar absolute. This absolute value is what European vacuum component catalogs specify for pump selection.
Key Takeaways
- Multiply inHg by 0.033864 to get bar.
- Standard atmosphere: 29.92 inHg = 1.01325 bar.
- Divide inHg by ~29.53 for a quick bar estimate.
- For vacuum: subtract vacuum inHg from 29.92, then multiply by 0.033864.
- Engine MAP sensors bridge inHg (US) and bar (European) diagnostics.
- European vacuum catalogs specify in bar (absolute); US gauges read inHg (vacuum).
Inch mercury to Bar Conversion Formula
bar = inch mercury × 0.0338638
1 inch mercury = 0.0338638 bar
1 bar = 29.5300586 inch mercury
Reverse: inch mercury = bar × 29.5300586
Frequently Asked Questions
How many bar are in 1 inch mercury?
There are 0.0338638 bar in 1 inch mercury. To convert inch mercury to bar, multiply the value by 0.0338638.
How do I convert inch mercury to bar?
Multiply your inch mercury value by 0.0338638 to get the equivalent in bar. For example, 5 inch mercury = 5 × 0.0338638 = 0.16932 bar.
How do I convert bar to inch mercury?
Multiply your bar value by 29.5300586 to get the equivalent in inch mercury. Alternatively, divide by 0.0338638.
What is 10 inch mercury in bar?
10 inch mercury is equal to 0.33864 bar.
What is 100 inch mercury in bar?
100 inch mercury is equal to 3.38638 bar.