Inches Of Mercury to Bars
Convert inches of mercury to bars instantly — one inch of mercury is 0.0338639 bars.
| Inches Of Mercury | Bars |
|---|---|
| 1 inHg | 0.033864 bar |
| 2 inHg | 0.067728 bar |
| 3 inHg | 0.101592 bar |
| 5 inHg | 0.169319 bar |
| 10 inHg | 0.338639 bar |
| 25 inHg | 0.846597 bar |
| 50 inHg | 1.693194 bar |
| 100 inHg | 3.386389 bar |
How to use
- Enter a value in the Inches Of Mercury field.
- The Bars figure appears immediately — no button to press.
- Typing in the Bars field converts back to Inches Of Mercury the same way.
- Use the reference table for the values that come up most often.
Inches Of Mercury to Bars formula
Converting inches of mercury to bars is a single multiplication by 0.03386389.
bar = inHg × 0.03386389
Why this factor: the inch of mercury and the bar are both defined against the pascal, so dividing one definition by the other gives 0.03386389 directly. Both definitions are set out in full below.
To go the other way, divide by 0.03386389 — or use the Bars to Inches Of Mercury converter, which is the same calculation reversed.
Worked example
Take 760 inHg and multiply by the factor 0.03386389: the result is 25.736556 bar.
760 inHg × 0.03386389 = 25.736556 bar
The converter above does this for any value you type, in either direction.
What is an inch of mercury?
An inch of mercury is the pressure of a one-inch mercury column, used for US barometric pressure.
Definition: About 3,386.389 pascals.
Where it is used: US weather barometric pressure, aircraft altimeter settings, and engine vacuum readings.
What is a bar?
A bar is a metric pressure unit chosen to sit very close to atmospheric pressure.
Definition: Exactly 100,000 pascals by definition. Standard atmosphere is 1.01325 bar, so a bar is slightly less.
Where it is used: European tire and hydraulic pressures, diving depth equivalents, and espresso machine ratings.
Worth knowing: Close to one atmosphere but not equal to it — the difference is about 1.3%.
Inches Of Mercury vs Bars
The inch of mercury is a US customary unit while the bar is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many bars are in an inch of mercury?
One inch of mercury equals 0.03386389 bars.
What is the formula to convert inches of mercury to bars?
Multiply the number of inches of mercury by 0.03386389. To reverse it, divide by 0.03386389 instead.
How do I convert bars back to inches of mercury?
Divide by 0.03386389, which is the same as multiplying by 29.5299802.
How many bars are in 10 inches of mercury?
10 inHg works out to 0.338639 bar.
Is there anything to watch out for with bars?
Close to one atmosphere but not equal to it — the difference is about 1.3%.
How is the inch of mercury defined?
About 3,386.389 pascals.