Convert Inches of mercury to Kilopascals
1 inch of mercury is 3.386389 kPa. One inch of mercury is exactly 3.386389 kilopascals.
One inch of mercury is 3.386389 kilopascals. To convert inches of mercury to kilopascals, multiply by 3.386389; to go the other way, divide by 3.386389 or multiply by 0.2952998. 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 × 3.386389
value * 3.3863893.386 kPa
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 kilopascals?
- 1.Take the measurement in inches of mercury.
- 2.Multiply by 3.386389 — that is how many kilopascals fit in one inch of mercury.
- 3.To go back the other way, divide by 3.386389, or multiply by 0.2952998.
Worked example: 25 inches of mercury to kilopascals
- Formula
- inHg × 3.386389 = kPa
- Arithmetic
- 25 × 3.386389 = 84.659725 kPa
- Answer
- 25 inHg = 84.659725 kPa
The factor is exact, so this figure is exact too — only the display is rounded.
Inches of mercury to kilopascals conversion table
| Inches of mercury | Kilopascals |
|---|---|
| 1 inHg | 3.386389 kPa |
| 2 inHg | 6.772778 kPa |
| 3 inHg | 10.159167 kPa |
| 4 inHg | 13.545556 kPa |
| 5 inHg | 16.931945 kPa |
| 6 inHg | 20.318334 kPa |
| 7 inHg | 23.704723 kPa |
| 8 inHg | 27.091112 kPa |
| 9 inHg | 30.477501 kPa |
| 10 inHg | 33.86389 kPa |
| 12 inHg | 40.636668 kPa |
| 15 inHg | 50.795835 kPa |
| 20 inHg | 67.72778 kPa |
| 25 inHg | 84.659725 kPa |
| 50 inHg | 169.31945 kPa |
| 100 inHg | 338.6389 kPa |
| 200 inHg | 677.2778 kPa |
| 300 inHg | 1,015.9167 kPa |
| 500 inHg | 1,693.1945 kPa |
| 1000 inHg | 3,386.389 kPa |
| 2000 inHg | 6,772.778 kPa |
| 5000 inHg | 16,931.945 kPa |
| 10000 inHg | 33,863.89 kPa |
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 kilopascal?
A thousand pascals, and the unit metric tyre placards and weather stations use. Atmospheric pressure at sea level is about 101 kPa.
How many kilopascals are in an inch of mercury?
One inch of mercury is 3.386389 kilopascals, exactly. Going the other way, one kilopascal is 0.2952998 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 kilopascals are in an inch of mercury?
- 3.386389. A thousand pascals, and the unit metric tyre placards and weather stations use. Atmospheric pressure at sea level is about 101 kPa.
- How do I convert kilopascals back to inches of mercury?
- Divide by 3.386389, or multiply by 0.2952998 — they are the same operation.
Other pressure conversions
Kilopascals to inches of mercury — the same conversion the other way.