Free Pressure Converter Online

The Pressure Converter is a free online tool that converts between PSI, bar, Pascal, atmospheres, and other pressure units.

Yes, it is completely free with no registration required. All conversions happen client-side in your browser.

The Pressure Converter supports PSI, bar, Pascal, kilopascal, atmospheres, mmHg, and other commonly used pressure units.

Absolutely. The Pressure Converter processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Pressure Converter is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Pressure Converter in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Pressure Converter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

One bar equals about 14.5038 PSI, because a bar is defined as exactly 100,000 pascals while one PSI is 6,894.757 pascals — dividing the two gives 14.5038. In everyday terms, the 2 bar a European tyre placard might specify is roughly 29 PSI, and a 2.4 bar recommendation is about 35 PSI. The reverse is just as common: to turn PSI into bar, divide by 14.5038, so a 32 PSI car tyre is close to 2.2 bar. These two units dominate tyre and pneumatic work, which is exactly where a slipped conversion causes under- or over-inflation. Rather than round in your head, enter your figure here, pick PSI or bar as the source, and read the exact equivalent — the result updates as you type and you can copy it in one click.

Atmospheric pressure is the weight of the air around you, about 101,325 pascals (1 atm) at sea level. Gauge pressure is measured relative to that atmosphere, so a tyre gauge reading 32 PSI means 32 PSI above the surrounding air — that is why a flat tyre reads zero even though real air is still inside it. Absolute pressure adds the two together: it counts from a perfect vacuum, so 32 PSI gauge is roughly 46.7 PSI absolute at sea level. Scientific and engineering work usually needs absolute values, while tyres, HVAC and most field gauges quote gauge pressure. This converter works in straight unit equivalents (it does not add or subtract atmosphere for you), so first decide whether your number is gauge or absolute, then enter it above to convert cleanly between PSI, bar, kPa, atm and more.

Air pressure at any height is the weight of all the air stacked above you, so the higher you climb, the less air remains overhead and the lower the pressure falls. The drop is exponential rather than linear, following the barometric formula: pressure roughly halves every 5,500 metres. That is why sea-level pressure of about 101,325 pascals falls to near 26,400 pascals at typical airliner cruising altitude, and why ears pop and engines lose power at elevation. Temperature and weather shift the exact numbers, but the trend is constant. This tool includes an altitude calculator that applies the barometric formula to estimate pressure at a height you enter in metres or feet, alongside its unit conversions — so you can both find the pressure at a given elevation and express it in PSI, bar, hPa or atm. Enter an altitude above to see it.

Weather pressure is usually quoted in hectopascals (hPa) or the numerically identical millibars, with standard sea-level pressure at 1013.25 hPa. As a rule of thumb, readings below about 1000 hPa point to unsettled, cloudy or stormy conditions, because low pressure lets air rise and form clouds and rain, while readings above roughly 1025 hPa signal fair, settled, dry weather as sinking air suppresses cloud formation. The trend matters as much as the value: a falling barometer often means worsening weather is on the way, and a steadily rising one suggests improvement. If your barometer reports inHg instead, 1013.25 hPa is about 29.92 inHg. Enter your reading in hPa here and the converter flags whether it leans toward stormy or fair, while also letting you switch the same value into mmHg, inHg or atm.

For everyday purposes mmHg and Torr are treated as equal — both are about 133.322 pascals — and this converter uses the same factor for each. Historically they differ by a hair: a Torr is defined as exactly 1/760 of a standard atmosphere, while a millimetre of mercury is based on the height of a mercury column, and the two diverge only in the seventh significant figure, far below normal measurement precision. Blood pressure is the most familiar use of mmHg: a healthy reading near 120/80 means systolic pressure of 120 mmHg, which works out to roughly 16,000 pascals or about 2.3 PSI above atmosphere. Lab and vacuum work, by contrast, tend to label the unit Torr. Enter a value in mmHg or Torr above to convert it into pascals, kPa, atm or any other supported pressure unit.