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Quick answers.

›Standard tire pressure in psi vs bar?

Most cars run at 30-35 psi, which is about 2.1-2.4 bar or 210-240 kPa. Always check your car's door sticker.

›What's 1 atmosphere?

1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg. It's the average sea-level air pressure.

›Why is blood pressure in mmHg?

Because the original sphygmomanometer used a column of mercury — height in mm directly indicated pressure. The unit stuck even though modern devices are digital.

›psi or kPa on tire sidewalls?

US-market tires usually show psi; rest-of-world tires show kPa or bar (sometimes both). 1 bar ≈ 14.5 psi.

›Is the converter free?

Yes — free, no signup, runs in your browser.