Convert pascals, bars, atmospheres and PSI

Technicians and engineers use it to compare pressure in pascals, bars, atmospheres or PSI while checking equipment or calculations.

Convert pascals, bars, atmospheres and PSI. Everything runs in your browser, so the values you enter are never uploaded, shared, or stored.

How to use

Enter the value you want to convert on the first line of the input box.
Name the source unit on the second line, then the target unit on the third.
Run the conversion and read the value expressed in the unit you asked for.
Clear the field and start again whenever the same pressure needs another unit.
The source units include pascal, kilopascal, bar, atmosphere, psi and millimetre of mercury.

Example

The sample converts 30 psi into bars. After running it, check first that the source and target units match your own problem, because swapping them gives a misleading answer that still looks plausible.

Input

30
psi
bar

Output

30 psi = 2.06842718795 bar

Limits and formats

The tool converts units only; it does not say whether a reading is absolute or gauge pressure.
Think about how many decimals actually matter in your work before copying a value into a report.
Read the unit printed next to the result: it is what gives the number its meaning.
Copy the result into your calculation instead of reusing it from memory later.

Where processing happens

The three values needed for the calculation are used directly by the page inside your browser. The conversion happens on your device, with no outside transmission, and the result is not remembered anywhere. You can convert a technical figure without sharing it.

Frequently asked questions

Can I convert in both directions?

Yes, simply swap the source and target units and run the conversion again. The calculation follows whatever you enter, so you can move from one unit to the other and come back whenever a document uses a different convention.

Which unit should I use for a reading taken from a gauge?

It depends on the equipment and on local practice: gauges often show bars, psi or kilopascals. Read the unit printed on the device, enter it as the source unit, then pick the unit your document expects.

Why does my answer differ from a colleague's?

Check that you both entered the same source and target units, then compare the starting values digit by digit. Confusing two units is enough to produce a different result.