I kept googling “2.5 bar to psi” during sensor tests, so I wrote a tiny webpage: https://bartopsi.xyz
It’s a single HTML/JS file—no frameworks. Pick an input unit and an output unit; the result appears instantly, and the formula is shown underneath for transparency. Supports bar, psi, kPa, atm, and more.
The code is open-source here: https://github.com/tutorial0/bar2psi
If you also juggle pressure units, feel free to bookmark, fork, or leave feedback.