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No. All calculations run locally in your browser using JavaScript.

What is standard atmospheric pressure?

Standard atmospheric pressure (1 atm) is defined as 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.696 PSI = 760 mmHg. This is approximately the air pressure at sea level.

What is the difference between PSI gauge and PSI absolute?

PSIg (gauge pressure) measures pressure relative to atmospheric pressure — a flat tyre reads 0 PSIg. PSIa (absolute) includes atmospheric pressure — a flat tyre reads ≈14.7 PSIa. This tool converts absolute pressures.

What pressure unit should I use for tyre pressure?

In the US: PSI (usually 32–35 PSI for passenger cars). In Europe: bar (usually 2.2–2.5 bar). kPa is also used (220–250 kPa). All are gauge pressures relative to atmosphere.

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Pressure Converter

Convert pressure between PSI, bar, pascal, kilopascal, atmosphere, torr and mmHg instantly. Free, browser-based, no signup.

🔄 Conversion Tools Free Browser-based

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Pressure Units

Pressure is defined as force per unit area. The SI unit is the Pascal (Pa). Other units are widely used in different fields: PSI in the US for tyres and hydraulics, bar in Europe, atm for atmospheric reference, and torr/mmHg in medicine and vacuum technology.

Conversion Reference

Unit	Equivalent in Pa	Common Use
1 Pa	1	SI base unit, very small
1 kPa	1,000	Weather, pneumatics
1 bar	100,000	Industrial, European tyre pressure
1 atm	101,325	Standard atmosphere at sea level
1 PSI	6,894.76	US tyre pressure, plumbing
1 Torr	133.322	Vacuum science, blood pressure
1 inHg	3,386.39	Aviation weather, barometers

Common Reference Pressures

Standard atmospheric pressure = 1 atm = 101,325 Pa = 14.696 PSI = 1.01325 bar. Normal car tyre pressure ≈ 30–35 PSI (2.07–2.41 bar). Blood pressure 120/80 mmHg = 16/10.7 kPa.

Pressure Converter

Pressure Units

Conversion Reference

Common Reference Pressures

Frequently Asked Questions