Unit conversion
Pressure Converter
Converts pressure, where gauge and absolute readings differ by atmospheric pressure.
Result
Conversions use exact internationally defined factors where one exists, so results are precise to the digits shown.
Get a Free Business AuditHow the calculation works
Each pressure unit multiplied by its factor relative to a base. The complication is the reference point: a gauge reading measures pressure above atmospheric while an absolute reading measures from vacuum, and the two differ by roughly one atmosphere, which is a large difference at low pressures.
What moves the number
- Whether the reading is gauge or absolute.
- The unit pair and its factor.
- Altitude, which changes atmospheric pressure.
- Whether the context is vacuum, liquid or gas.
Where this one goes wrong
Most practical gauges read gauge pressure, so a reading of zero means atmospheric rather than nothing, and converting a gauge reading as though it were absolute understates the absolute pressure by about one atmosphere. Establish which the reading is. At low pressures that difference dominates the figure, which is why vacuum and low-pressure work always specifies the reference.
Before you quote
- Establish whether a reading is gauge or absolute.
- Note that atmospheric pressure varies with altitude and weather.
- Specify the reference in any low-pressure or vacuum context.
Questions
About this calculator
What is the difference between gauge and absolute pressure?
Gauge measures above atmospheric; absolute measures from vacuum. They differ by roughly one atmosphere, which is a large difference at low pressures and why most gauges reading zero mean atmospheric rather than nothing.
Does altitude affect pressure readings?
It affects atmospheric pressure, which is the reference a gauge reading is relative to. That means the same absolute pressure reads differently on a gauge at sea level and at altitude, which matters in some calibration and process contexts.
Which unit should be used?
Whichever the context uses consistently, with the reference stated. Mixing gauge and absolute readings in one calculation is the error that matters far more than the choice between pounds per square inch, bar and pascals.
Common pressure conversions
| From | Equals |
|---|---|
| 1 PSI | 1 PSI |
| 1 PSI | 0.068948 Bar |
| 1 PSI | 6.894757 Kilopascals |
| 1 PSI | 6,894.757293 Pascals |
| 1 PSI | 0.068046 Atmospheres |
| 1 PSI | 51.714925 mmHg (torr) |
| 1 PSI | 2.03602 inHg |
| 1 PSI | 27.679906 Inches of water column |
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How to use this calculator
- Value. Enter your own figure; the page starts at 60.
- From. Enter your own figure; the page starts at PSI.
- To. Enter your own figure; the page starts at Bar.
The result updates as you type, so you can try a figure, see what it does to converted value, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Value | 60 |
| From | PSI |
| To | Bar |
What comes out
| Result | Value |
|---|---|
| Converted value main result | 4.1369 |
| Conversion factor | 0.068948 |
60 PSI equals 4.1369 Bar.
How sensitive the answer is
Holding everything else steady and changing only value, this is what happens to converted value. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Value | Converted value |
|---|---|
| 30 | 2.0684 |
| 45 | 3.1026 |
| 60 example above | 4.1369 |
| 90 | 6.2053 |
| 120 | 8.2737 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Value
- A number, starting at 60.
- From
- Choose from PSI, Bar, Kilopascals, Pascals, Atmospheres, mmHg (torr), inHg, Inches of water column.
- To
- Choose from PSI, Bar, Kilopascals, Pascals, Atmospheres, mmHg (torr), inHg, Inches of water column.
What the results tell you
| Result | What it is |
|---|---|
| Converted value | The headline result. A number. |
| Conversion factor | A number. |
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