How does the pressure converter work?

All pressure units are stored relative to pascals. The calculator converts your input to pascals, then to the target unit, so psi, bar, atmospheres, and mmHg convert accurately.

How many psi are in a bar?

One bar equals 14.5038 psi. Tire pressures are often quoted in both, with common car tire pressures around 30-35 psi or 2.1-2.4 bar.

A pascal (Pa) is the SI unit of pressure: one newton per square meter. Because it is small, pressures are often expressed in kilopascals (kPa) or megapascals (MPa).

What is atmospheric pressure?

Standard atmospheric pressure at sea level is 1 atmosphere, equal to about 101.325 kPa, 14.696 psi, or 760 mmHg. This converter uses that standard definition.

Which pressure unit should I use?

It depends on the field: psi for tires and US industry, bar for EU engineering, pascals in science, and mmHg in medicine for blood pressure. The converter covers all common options.