How many psi are in a bar?

1 bar equals about 14.5038 psi.

How do I convert Pa to kPa?

Divide the pascal value by 1,000. For example, 5,000 Pa equals 5 kPa.

What is 1 atmosphere in psi?

1 standard atmosphere (atm) equals about 14.696 psi.

What is the difference between absolute and gauge pressure?

Absolute pressure is measured from a perfect vacuum (zero pressure). Gauge pressure is measured relative to the surrounding atmosphere, so it reads zero at normal atmospheric pressure. A car tire gauge reads gauge pressure; this converter works with absolute pressure values.

How many mmHg are in 1 atmosphere?

1 standard atmosphere equals exactly 760 mmHg.

What is standard atmospheric pressure?

Standard atmospheric pressure at sea level is defined as 101,325 pascals, equal to 1 atm, 1013.25 mbar, or 14.696 psi.

How does altitude affect air pressure?

Air pressure decreases as altitude increases, because there is less atmosphere pressing down from above. Pressure drops roughly exponentially with height, which is why mountaintops and airplane cabins need pressurization or acclimatization.

Why do tire pressures use psi or bar?

Psi (pounds per square inch) is the standard in the US and UK, while bar is standard in most of Europe and Asia. Both measure the same thing, gauge pressure inside the tire relative to the atmosphere.

Is a torr the same as an mmHg?

They are almost identical. 1 torr equals 101325/760 pascals exactly, while 1 mmHg equals 133.322387415 pascals by convention. The difference is smaller than 0.000015% and is negligible for nearly all practical purposes.

Is this pressure converter free to use?

Yes, it is completely free, requires no registration, and runs entirely in your browser with no usage limits.

Responsive Advertisement

Pressure Conversion

14 units · altitude estimator

Pressure Converter

Convert instantly between pascal, bar, atmosphere, psi, torr, mmHg, inHg and more, then estimate how atmospheric pressure changes with altitude — all calculated in your browser.

14Pressure units

101,325Pa in 1 standard atm

0msServer round-trips

From

bar

To

psi

14.5037743897psi

psi = bar × 14.5037743897

Altitude

Altitude unit

Show pressure in

79.5 kPa

P = 101325 × (1 − 2.25577e-5 × h)^5.25588

Runs locally, no data sent Standard NIST/ICAO factors Free, no sign-up

Pressure concepts & formulas

The math behind every conversion above, and the details that trip people up most.

Quick conversion table

Common values for your selected units in the converter above, updated automatically.

Bar	PSI

Pressure unit reference

What each unit means, its exact size in pascals, and where you'll typically see it used.

More converters from ConvertGPT

Working across other units too? Here's the rest of the toolkit.

Frequently asked questions

Straight answers to the questions people ask most about pressure units and altitude.

All calculations and conversions run locally in your browser using standard NIST/ICAO conversion factors. No data is sent anywhere.

Convertgpt