Inches Of Mercury to Kilopascals
An instant inches of mercury-to-kilopascals converter, with the formula and a reference table below.
| Inches Of Mercury | Kilopascals |
|---|---|
| 1 inHg | 3.386389 kPa |
| 2 inHg | 6.772778 kPa |
| 3 inHg | 10.159167 kPa |
| 5 inHg | 16.931945 kPa |
| 10 inHg | 33.86389 kPa |
| 25 inHg | 84.659725 kPa |
| 50 inHg | 169.31945 kPa |
| 100 inHg | 338.6389 kPa |
How to use
- Enter a value in the Inches Of Mercury field.
- The Kilopascals figure appears immediately — no button to press.
- Typing in the Kilopascals 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 Kilopascals formula
Converting inches of mercury to kilopascals is a single multiplication by 3.386389.
kPa = inHg × 3.386389
Why this factor: the inch of mercury and the kilopascal are both defined against the pascal, so dividing one definition by the other gives 3.386389 directly. Both definitions are set out in full below.
To go the other way, divide by 3.386389 — or use the Kilopascals to Inches Of Mercury converter, which is the same calculation reversed.
Worked example
Take 32 inHg and multiply by the factor 3.386389: the result is 108.364448 kPa.
32 inHg × 3.386389 = 108.364448 kPa
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 kilopascal?
A kilopascal is 1,000 pascals, the practical metric pressure unit.
Definition: Exactly 1,000 pascals. Standard atmospheric pressure is 101.325 kPa.
Where it is used: Tyre pressures outside the US, weather reports in Canada, and structural engineering loads.
Inches Of Mercury vs Kilopascals
The inch of mercury is a US customary unit while the kilopascal 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 kilopascals are in an inch of mercury?
One inch of mercury equals 3.386389 kilopascals.
What is the formula to convert inches of mercury to kilopascals?
Multiply the number of inches of mercury by 3.386389. To reverse it, divide by 3.386389 instead.
How do I convert kilopascals back to inches of mercury?
Divide by 3.386389, which is the same as multiplying by 0.295299802.
How many kilopascals are in 10 inches of mercury?
10 inHg works out to 33.86389 kPa.
How is the inch of mercury defined?
About 3,386.389 pascals.