Convert Inches of mercury to Pounds per square inch
1 inch of mercury is 0.491154 psi. One inch of mercury is exactly 0.491154199634 pounds per square inch.
One inch of mercury is 0.4911542 pounds per square inch. To convert inches of mercury to pounds per square inch, multiply by 0.4911542; to go the other way, divide by 0.4911542 or multiply by 2.0360205. 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 × 0.4911542
value * 0.4911541996340.491 psi
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 pounds per square inch?
- 1.Take the measurement in inches of mercury.
- 2.Multiply by 0.4911542 — that is how many pounds per square inch fit in one inch of mercury.
- 3.To go back the other way, divide by 0.4911542, or multiply by 2.0360205.
Worked example: 25 inches of mercury to pounds per square inch
- Formula
- inHg × 0.4911542 = psi
- Arithmetic
- 25 × 0.4911542 = 12.278855 psi
- Answer
- 25 inHg = 12.278855 psi
The factor is rounded for display; the figure above is computed from the full value.
Inches of mercury to pounds per square inch conversion table
| Inches of mercury | Pounds per square inch |
|---|---|
| 1 inHg | 0.491154 psi |
| 2 inHg | 0.982308 psi |
| 3 inHg | 1.473463 psi |
| 4 inHg | 1.964617 psi |
| 5 inHg | 2.455771 psi |
| 6 inHg | 2.946925 psi |
| 7 inHg | 3.438079 psi |
| 8 inHg | 3.929234 psi |
| 9 inHg | 4.420388 psi |
| 10 inHg | 4.911542 psi |
| 12 inHg | 5.89385 psi |
| 15 inHg | 7.367313 psi |
| 20 inHg | 9.823084 psi |
| 25 inHg | 12.278855 psi |
| 50 inHg | 24.55771 psi |
| 100 inHg | 49.11542 psi |
| 200 inHg | 98.23084 psi |
| 300 inHg | 147.34626 psi |
| 500 inHg | 245.5771 psi |
| 1000 inHg | 491.1542 psi |
| 2000 inHg | 982.308399 psi |
| 5000 inHg | 2,455.770998 psi |
| 10000 inHg | 4,911.541996 psi |
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 pound per square inch?
A pound-force spread over a square inch. Exact, because both parts are: it is 4.4482216152605 newtons divided by an inch squared. Every US tyre gauge, air line and pressure washer is marked in it.
How many pounds per square inch are in an inch of mercury?
One inch of mercury is 0.4911542 pounds per square inch. Going the other way, one pound per square inch is 2.0360205 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 pounds per square inch are in an inch of mercury?
- 0.4911542. A pound-force spread over a square inch. Exact, because both parts are: it is 4.4482216152605 newtons divided by an inch squared. Every US tyre gauge, air line and pressure washer is marked in it.
- How do I convert pounds per square inch back to inches of mercury?
- Divide by 0.4911542, or multiply by 2.0360205 — they are the same operation.
Other pressure conversions
Pounds per square inch to inches of mercury — the same conversion the other way.