Convert Inches of mercury to Bars
1 inch of mercury is 0.033864 bar. One inch of mercury is exactly 0.03386389 bars.
One inch of mercury is 0.03386389 bars. To convert inches of mercury to bars, multiply by 0.03386389; to go the other way, divide by 0.03386389 or multiply by 29.52998. The factor is exact rather than rounded: it follows from NIST Special Publication 811. The pressure of a one-inch column of mercury at 0 °C, fixed by convention at 3,386.389 pascals.
Factor checked against the defining standard · How we check
- Inches of mercury × 0.03386389
value * 0.033863890.034 bar
1 inch of mercury in every pressure unit
| Unit | Value | Exact factor |
|---|---|---|
| pounds per square inch | 0.4911541996 psi | × 0.491154199634 |
| bars | 0.03386389 bar | × 0.03386389 |
| pascals | 3,386.389 Pa | × 3,386.389 |
| kilopascals | 3.386389 kPa | × 3.386389 |
| megapascals | 0.003386389 MPa | × 0.003386389 |
| atmospheres | 0.03342106094 atm | × 0.0334210609425 |
| torr | 25.40000632 Torr | × 25.4000063163 |
| inches of mercury (as entered) | 1 inHg | — |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert inches of mercury to bars?
- 1.Take the measurement in inches of mercury.
- 2.Multiply by 0.03386389 — that is how many bars fit in one inch of mercury.
- 3.To go back the other way, divide by 0.03386389, or multiply by 29.52998.
Worked example: 25 inches of mercury to bars
- Formula
- inHg × 0.03386389 = bar
- Arithmetic
- 25 × 0.03386389 = 0.846597 bar
- Answer
- 25 inHg = 0.846597 bar
The factor is exact, so this figure is exact too — only the display is rounded.
Inches of mercury to bars conversion table
| Inches of mercury | Bars |
|---|---|
| 1 inHg | 0.033864 bar |
| 2 inHg | 0.067728 bar |
| 3 inHg | 0.101592 bar |
| 4 inHg | 0.135456 bar |
| 5 inHg | 0.169319 bar |
| 6 inHg | 0.203183 bar |
| 7 inHg | 0.237047 bar |
| 8 inHg | 0.270911 bar |
| 9 inHg | 0.304775 bar |
| 10 inHg | 0.338639 bar |
| 12 inHg | 0.406367 bar |
| 15 inHg | 0.507958 bar |
| 20 inHg | 0.677278 bar |
| 25 inHg | 0.846597 bar |
| 50 inHg | 1.693195 bar |
| 100 inHg | 3.386389 bar |
| 200 inHg | 6.772778 bar |
| 300 inHg | 10.159167 bar |
| 500 inHg | 16.931945 bar |
| 1000 inHg | 33.86389 bar |
| 2000 inHg | 67.72778 bar |
| 5000 inHg | 169.31945 bar |
| 10000 inHg | 338.6389 bar |
What is an inch of mercury?
The pressure of a one-inch column of mercury at 0 °C, fixed by convention at 3,386.389 pascals. US aviation altimeters and barometers read in it.
What is a bar?
Exactly 100,000 pascals by definition, chosen because it sits within a per cent of atmospheric pressure at sea level. European tyre placards and dive computers use it.
How many bars are in an inch of mercury?
One inch of mercury is 0.03386389 bars, exactly. Going the other way, one bar is 29.52998 inches of mercury. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every pressure unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Pounds per square inch | psi | 6894.7573 pascal |
| Bars | bar | 100000 pascal |
| Pascals | Pa | the base unit |
| Kilopascals | kPa | 1000 pascal |
| Megapascals | MPa | 1000000 pascal |
| Atmospheres | atm | 101325 pascal |
| Torr | Torr | 133.32237 pascal |
| Inches of mercury | inHg | 3386.389 pascal |
Questions people actually ask
- How many bars are in an inch of mercury?
- 0.03386389. Exactly 100,000 pascals by definition, chosen because it sits within a per cent of atmospheric pressure at sea level. European tyre placards and dive computers use it.
- How do I convert bars back to inches of mercury?
- Divide by 0.03386389, or multiply by 29.52998 — they are the same operation.
Other pressure conversions
Bars to inches of mercury — the same conversion the other way.