Convert Inches of mercury to Megapascals
1 inch of mercury is 0.003386 MPa. One inch of mercury is exactly 0.003386389 megapascals.
One inch of mercury is 0.003386389 megapascals. To convert inches of mercury to megapascals, multiply by 0.003386389; to go the other way, divide by 0.003386389 or multiply by 295.2998. 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 × 0.003386389
value * 0.0033863890.003 MPa
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 megapascals?
- 1.Take the measurement in inches of mercury.
- 2.Multiply by 0.003386389 — that is how many megapascals fit in one inch of mercury.
- 3.To go back the other way, divide by 0.003386389, or multiply by 295.2998.
Worked example: 25 inches of mercury to megapascals
- Formula
- inHg × 0.003386389 = MPa
- Arithmetic
- 25 × 0.003386389 = 0.08466 MPa
- Answer
- 25 inHg = 0.08466 MPa
The factor is exact, so this figure is exact too — only the display is rounded.
Inches of mercury to megapascals conversion table
| Inches of mercury | Megapascals |
|---|---|
| 1 inHg | 0.003386 MPa |
| 2 inHg | 0.006773 MPa |
| 3 inHg | 0.010159 MPa |
| 4 inHg | 0.013546 MPa |
| 5 inHg | 0.016932 MPa |
| 6 inHg | 0.020318 MPa |
| 7 inHg | 0.023705 MPa |
| 8 inHg | 0.027091 MPa |
| 9 inHg | 0.030478 MPa |
| 10 inHg | 0.033864 MPa |
| 12 inHg | 0.040637 MPa |
| 15 inHg | 0.050796 MPa |
| 20 inHg | 0.067728 MPa |
| 25 inHg | 0.08466 MPa |
| 50 inHg | 0.169319 MPa |
| 100 inHg | 0.338639 MPa |
| 200 inHg | 0.677278 MPa |
| 300 inHg | 1.015917 MPa |
| 500 inHg | 1.693195 MPa |
| 1000 inHg | 3.386389 MPa |
| 2000 inHg | 6.772778 MPa |
| 5000 inHg | 16.931945 MPa |
| 10000 inHg | 33.86389 MPa |
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 megapascal?
A million pascals. Concrete strength and hydraulic ratings are specified here: 30 MPa concrete is about 4,350 psi.
How many megapascals are in an inch of mercury?
One inch of mercury is 0.003386389 megapascals, exactly. Going the other way, one megapascal is 295.2998 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 megapascals are in an inch of mercury?
- 0.003386389. A million pascals. Concrete strength and hydraulic ratings are specified here: 30 MPa concrete is about 4,350 psi.
- How do I convert megapascals back to inches of mercury?
- Divide by 0.003386389, or multiply by 295.2998 — they are the same operation.
Other pressure conversions
Megapascals to inches of mercury — the same conversion the other way.