Convert Bar to Inches of Mercury
Instantly convert Bar (bar) to Inches of Mercury (inHg) with our free online calculator.
Formula: bar to inHg — multiply by 29.53
Reference Table
| Bar (bar) | Inches of Mercury (inHg) |
|---|---|
| 1 | 29.53 |
| 5 | 147.65 |
| 10 | 295.3 |
| 25 | 738.249 |
| 50 | 1476.5 |
| 100 | 2953 |
How to Convert Bar to Inches of Mercury
Formula
To convert Bar (bar) to Inches of Mercury (inHg): multiply by 29.53
Step-by-Step
- Start with your value in Bar (bar).
- Multiply by 29.53 to perform the conversion.
- The result is your value expressed in Inches of Mercury (inHg).
Conversion Factor
1 bar = 29.53 inHg
Reverse Factor
1 inHg = 0.0338639 bar
Worked Example
Convert 25 Bar to Inches of Mercury: 25 bar = 738.249 inHg
About Bar (bar)
A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1.01325 bar). Defined by IUPAC and accepted for use with the SI by the BIPM, the bar is not itself an SI-proper unit but is universally recognized in engineering. Bars are the default unit in European industry for compressed gas systems (compressed air at 6-10 bar shop pressure), hydraulics (mobile equipment at 200-400 bar working pressure), and chemical process plants. Car tire pressures in much of the world outside the US are specified in bar (a typical passenger car runs ~2.2 bar / 32 psi cold). Gauges on scuba cylinders (200 bar fill / ~2900 psi), brewery CO₂ tanks, fire suppression systems, and espresso machines (9 bar extraction pressure) all read in bar. 1 bar = 14.504 psi = 100 kPa = 0.9869 atm.
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 Bar equals 29.53 Inches of Mercury
- 1 Inch of Mercury equals 0.0338639 Bar
- Bar 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 Bar belongs to the metric system
- The Inch of Mercury belongs to the imperial system
Common Bar to Inch of Mercury Conversions
| Bar (bar) | Inches of Mercury (inHg) |
|---|---|
| 0.1 | 2.953 |
| 0.5 | 14.765 |
| 1 | 29.53 |
| 2 | 59.0599 |
| 5 | 147.65 |
| 10 | 295.3 |
| 14.696 | 433.972 |
| 15 | 442.95 |
| 20 | 590.599 |
| 25 | 738.249 |
| 50 | 1476.5 |
| 100 | 2953 |
| 150 | 4429.5 |
| 200 | 5905.99 |
| 500 | 14765 |
| 1000 | 29530 |
Understanding Bar
The Bar (symbol: bar) is a unit of pressure. A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1.01325 bar). Defined by IUPAC and accepted for use with the SI by the BIPM, the bar is not itself an SI-proper unit but is universally recognized in engineering. Bars are the default unit in European industry for compressed gas systems (compressed air at 6-10 bar shop pressure), hydraulics (mobile equipment at 200-400 bar working pressure), and chemical process plants. Car tire pressures in much of the world outside the US are specified in bar (a typical passenger car runs ~2.2 bar / 32 psi cold). Gauges on scuba cylinders (200 bar fill / ~2900 psi), brewery CO₂ tanks, fire suppression systems, and espresso machines (9 bar extraction pressure) all read in bar. 1 bar = 14.504 psi = 100 kPa = 0.9869 atm.
It belongs to the metric measurement system.
Bar 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 Bar to Inches of Mercury?
Engineers, mechanics, and scientists frequently need to convert pressure between Bar 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 Bar to Inches of Mercury?
A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1. To convert Bar to Inches of Mercury, multiply by 29.53. For example, 25 bar equals 738.249 inHg.
How many Inches of Mercury are in 1 Bar?
There are 29.53 Inches of Mercury in 1 Bar.
How many Bar are in 1 Inch of Mercury?
There are 0.0338639 Bar in 1 Inch of Mercury.
What is the formula for Bar to Inch of Mercury conversion?
The formula is: multiply by 29.53. This means 1 bar = 29.53 inHg.
Is a Bar bigger than a Inch of Mercury?
No. One Bar is smaller than one Inch of Mercury because 1 bar equals 29.53 inHg, which is greater than 1.
When do you need to convert between Bar 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. Bar 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.