Convert Inches of mercury to Pascals
1 inch of mercury is 3,386.389 Pa. One inch of mercury is exactly 3386.389 pascals.
One inch of mercury is 3386.389 pascals. To convert inches of mercury to pascals, multiply by 3386.389; to go the other way, divide by 3386.389 or multiply by 2.9530 × 10^-4. 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 × 3386.389
value * 3386.3893,386.389 Pa
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 pascals?
- 1.Take the measurement in inches of mercury.
- 2.Multiply by 3386.389 — that is how many pascals fit in one inch of mercury.
- 3.To go back the other way, divide by 3386.389, or multiply by 2.9530 × 10^-4.
Worked example: 25 inches of mercury to pascals
- Formula
- inHg × 3386.389 = Pa
- Arithmetic
- 25 × 3386.389 = 84,659.725 Pa
- Answer
- 25 inHg = 84,659.725 Pa
The factor is exact, so this figure is exact too — only the display is rounded.
Inches of mercury to pascals conversion table
| Inches of mercury | Pascals |
|---|---|
| 1 inHg | 3,386.389 Pa |
| 2 inHg | 6,772.778 Pa |
| 3 inHg | 10,159.167 Pa |
| 4 inHg | 13,545.556 Pa |
| 5 inHg | 16,931.945 Pa |
| 6 inHg | 20,318.334 Pa |
| 7 inHg | 23,704.723 Pa |
| 8 inHg | 27,091.112 Pa |
| 9 inHg | 30,477.501 Pa |
| 10 inHg | 33,863.89 Pa |
| 12 inHg | 40,636.668 Pa |
| 15 inHg | 50,795.835 Pa |
| 20 inHg | 67,727.78 Pa |
| 25 inHg | 84,659.725 Pa |
| 50 inHg | 169,319.45 Pa |
| 100 inHg | 338,638.9 Pa |
| 200 inHg | 677,277.8 Pa |
| 300 inHg | 1,015,916.7 Pa |
| 500 inHg | 1,693,194.5 Pa |
| 1000 inHg | 3,386,389 Pa |
| 2000 inHg | 6,772,778 Pa |
| 5000 inHg | 16,931,945 Pa |
| 10000 inHg | 33,863,890 Pa |
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 pascal?
The SI unit: one newton spread over one square metre. It is a small pressure — a sheet of paper resting on a table is about one pascal — which is why the kilopascal is what instruments actually read.
How many pascals are in an inch of mercury?
One inch of mercury is 3386.389 pascals, exactly. Going the other way, one pascal is 2.9530 × 10^-4 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 pascals are in an inch of mercury?
- 3386.389. The SI unit: one newton spread over one square metre. It is a small pressure — a sheet of paper resting on a table is about one pascal — which is why the kilopascal is what instruments actually read.
- How do I convert pascals back to inches of mercury?
- Divide by 3386.389, or multiply by 2.9530 × 10^-4 — they are the same operation.
Other pressure conversions
Pascals to inches of mercury — the same conversion the other way.