Inches Of Mercury to Pascals
Convert inches of mercury to pascals instantly — one inch of mercury is 3386.39 pascals.
| Inches Of Mercury | Pascals |
|---|---|
| 1 inHg | 3386.389 Pa |
| 2 inHg | 6772.778 Pa |
| 3 inHg | 10159.167 Pa |
| 5 inHg | 16931.945 Pa |
| 10 inHg | 33863.89 Pa |
| 25 inHg | 84659.725 Pa |
| 50 inHg | 169319.45 Pa |
| 100 inHg | 338638.9 Pa |
How to use
- Enter a value in the Inches Of Mercury field.
- The Pascals figure appears immediately — no button to press.
- Typing in the Pascals 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 Pascals formula
To convert inches of mercury to pascals, multiply by 3386.389.
Pa = inHg × 3386.389
Why this factor: the inch of mercury and the pascal are both defined against the pascal, so dividing one definition by the other gives 3386.389 directly. Both definitions are set out in full below.
To go the other way, divide by 3386.389 — or use the Pascals to Inches Of Mercury converter, which is the same calculation reversed.
Worked example
Given 100 inHg, multiplying by 3386.389 yields 338638.9 Pa.
100 inHg × 3386.389 = 338638.9 Pa
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 pascal?
The pascal is the SI unit of pressure — one newton of force spread over one square meter.
Definition: Defined as 1 N/m². Named after Blaise Pascal.
Where it is used: Scientific and engineering pressure calculations, and weather pressure in hectopascals.
Worth knowing: A single pascal is a very small pressure, which is why weather reports use hectopascals and engineering uses kilopascals.
Inches Of Mercury vs Pascals
The inch of mercury is a US customary unit while the pascal is an SI 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 pascals are in an inch of mercury?
One inch of mercury equals 3386.389 pascals.
What is the formula to convert inches of mercury to pascals?
Multiply the number of inches of mercury by 3386.389. To reverse it, divide by 3386.389 instead.
How do I convert pascals back to inches of mercury?
Divide by 3386.389, which is the same as multiplying by 0.000295299802.
How many pascals are in 10 inches of mercury?
10 inHg works out to 33863.89 Pa.
Is there anything to watch out for with pascals?
A single pascal is a very small pressure, which is why weather reports use hectopascals and engineering uses kilopascals.
How is the inch of mercury defined?
About 3,386.389 pascals.