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Pressure Converter

Convert pressure between Pa, kPa, bar, psi, atm & mmHg

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Enter the pressure value you want to convert (for example, 32).
  2. 2.Choose the unit to convert from and the unit to convert to, such as psi to bar.
  3. 3.Read the converted result instantly below, or tick 'Show all units at once' to see every unit together.

About Pressure Converter

Pressure is force spread over an area — one newton pushing on one square metre equals one pascal (Pa), the SI base unit this converter uses as its single reference point. Because a pascal is tiny, real-world pressures are usually quoted in larger units: kilopascals (kPa), megapascals (MPa), bar, or the pound per square inch (psi). This free pressure converter turns any value into all of them instantly, entirely in your browser, with nothing uploaded to a server. It handles twelve units in total — Pa, kPa, MPa, hPa, bar, mbar, atm, psi, torr, mmHg, inHg and kgf/cm².

Every unit exists because a particular field found it convenient. Engineers and North American tire gauges read in psi; the bar and its cousins the millibar (mbar) and hectopascal (hPa) dominate industrial and weather work, where 1 bar is close to sea-level air pressure. The standard atmosphere (atm) is defined as exactly 101325 Pa. Medicine and meteorology still measure in mercury columns — blood pressure in mmHg, barometric pressure in inHg — while the technical atmosphere (kgf/cm²) lingers on older machinery and pressure gauges. Weather reports in North America often quote a barometer in inHg, where 29.92 inHg marks a standard-pressure day, and hPa and mbar are numerically the same, which is why a 1013 hPa forecast equals 1013 mbar.

The conversions people look up most are quick to read off here. 1 bar equals 14.5038 psi and 100 kPa; 1 atm equals 14.6959 psi, 1.01325 bar, or 760 torr; and 1 psi equals 6894.76 Pa or about 0.0689 bar. So a car tire pressure of 32 psi is roughly 2.21 bar or 221 kPa, and a 100 psi compressor rating is about 6.89 bar. Going the other way, kpa to psi is common too: 200 kPa is about 29.0 psi. Type a number, pick your from and to units, and the answer updates as you type.

One subtlety is worth knowing: mmHg and Torr look identical but are defined differently. A Torr is exactly 1/760 of a standard atmosphere (133.3224 Pa), while the conventional millimetre of mercury is 133.322387 Pa, fixed from a reference mercury density. They differ by only about one part in seven million — negligible for everyday use — but this tool keeps them as separate units so scientific work stays exact. That same care runs through the whole tool: every factor traces back to NIST Special Publication 811 or an exact SI definition, not a rounded shortcut.

To use it, enter a value, choose the unit you are converting from and the unit you want, then read the result immediately — there is no button to press. Tick 'Show all units at once' to see your value expressed in all twelve units side by side, which is handy for cross-checking a spec sheet or a datasheet. Everything runs locally in your browser, so it is fast, private, and keeps working offline once the page has loaded.

Frequently asked questions

How many psi are in 1 bar?
1 bar equals 14.5038 psi (and exactly 100000 Pa, or 100 kPa). Going the other way, 1 psi equals about 0.0689476 bar, so to turn psi into bar you divide by 14.5038 or multiply by 0.0689476. For example, 100 psi is about 6.89 bar.
How do I convert psi to kPa?
Multiply the psi value by 6.89476, because 1 psi equals 6894.76 Pa, which is 6.89476 kPa. So 30 psi is about 206.8 kPa and 50 psi is about 344.7 kPa. To go from kpa to psi instead, divide by 6.89476 — 200 kPa is roughly 29.0 psi.
What is 1 atm in psi?
1 standard atmosphere (atm) equals 14.6959 psi. The standard atmosphere is defined as exactly 101325 Pa, which is also 1.01325 bar, 101.325 kPa, or 760 torr. It represents average air pressure at sea level, so atm to psi is useful for comparing gauge readings to ambient pressure.
Are mmHg and Torr the same?
They are almost identical but defined differently, so this tool keeps them separate. A Torr is exactly 1/760 of a standard atmosphere (133.32237 Pa), while the conventional millimetre of mercury (mmHg) is 133.322387 Pa. The gap is about one part in seven million — irrelevant for blood pressure or weather, but it matters for precise scientific work.
How do I convert tire pressure from psi to bar?
Divide the psi reading by 14.5038 (or multiply by 0.0689476). A typical 32 psi tire is about 2.21 bar, 35 psi is about 2.41 bar, and 40 psi is about 2.76 bar. Many European gauges show bar or kPa, so this is the quickest way to match your car's recommended psi to a bar gauge.

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