Pressure converter — bar, Pa, hPa, kPa, psi, atm, mmHg
This pressure converter lets you instantly convert between all common pressure units: pascals, bars, hectopascals, kilopascals, psi, physical atmospheres and millimetres of mercury. Useful for mechanics, hydraulics engineers, meteorologists, divers and anyone needing a quick and precise pressure conversion without manual calculation.
Na tej stronie
How we convert pressure
All units are converted through a common base — the pascal (Pa). Each unit is multiplied by its conversion factor to Pa (e.g. 1 bar = 100,000 Pa, 1 psi = 6,894.76 Pa, 1 atm = 101,325 Pa), then divided by the target unit factor. The result is rounded based on its order of magnitude.
Example calculation
Converting tyre pressure: 2.2 bar to psi. Multiply: 2.2 × 14.5038 = 31.91 psi. Or: 2.2 bar × 100,000 = 220,000 Pa = 220 kPa. The converter does this automatically with full precision.
Frequently asked questions
What is pressure and what are its units?
Pressure is force per unit area (F/A). The SI base unit is the pascal (Pa = N/m²). Common units include bar (1 bar = 100,000 Pa), hPa (meteorology), kPa, psi (pounds per square inch — used in the US and UK), atm (standard atmosphere) and mmHg (millimetres of mercury — medicine).
How much is 1 bar in Pa, hPa and kPa?
1 bar = 100,000 Pa = 1,000 hPa = 100 kPa. A bar is very close to atmospheric pressure (1 atm ≈ 1.01325 bar). It is widely used in engineering, hydraulics and for tyre pressure.
What is psi and when is it used?
PSI (pound per square inch) is a pressure unit mainly used in the USA and UK. 1 psi ≈ 6,894.76 Pa ≈ 0.0689 bar. It is used for tyre pressure (e.g. 32 psi ≈ 2.2 bar), hydraulic and pneumatic systems.
What is the physical atmosphere (atm)?
The physical atmosphere (atm) is defined as mean atmospheric pressure at sea level: 1 atm = 101,325 Pa = 1,013.25 hPa ≈ 1.01325 bar ≈ 14.696 psi ≈ 760 mmHg. Used in chemistry (STP conditions), diving and astronautics.
Why do meteorologists use hPa instead of Pa?
The hectopascal (hPa) is convenient in meteorology because atmospheric pressure at sea level is about 1013 hPa — an easy number to remember. It is numerically identical to the millibar (1 hPa = 1 mbar).
What is mmHg and where is it used?
Millimetre of mercury (mmHg) derives from mercury manometers. 1 mmHg ≈ 133.32 Pa. Commonly used in medicine for blood pressure (e.g. 120/80 mmHg) and intraocular pressure, as well as in vacuum technology.
How do I manually convert bar to psi?
Multiply the bar value by 14.5038. Example: 2 bar × 14.5038 ≈ 29 psi. Reverse: 1 psi ≈ 0.0689 bar. Quick rule: 1 bar ≈ 14.5 psi. The converter does this with full accuracy.
What pressure should car tyres be inflated to?
Typical car tyre pressure is 1.8–2.5 bar (about 26–36 psi). Check the recommended value in your owner's manual or the label inside the driver's door jamb. Too low increases fuel consumption and puncture risk; too high reduces grip and comfort.
What is the difference between absolute and gauge pressure?
Absolute pressure is measured from absolute vacuum (0 Pa). Gauge pressure is measured relative to atmospheric pressure — e.g. a tyre gauge reads 2 bar gauge, but absolute pressure inside is about 3.013 bar. This converter works with absolute pressure values.
How does pressure affect diving?
During diving, pressure increases by about 1 atm (1.01325 bar) for every 10 metres of depth. At 10 m the pressure is about 2 atm (202.65 kPa); at 30 m about 4 atm. This is critical for calculating breathing mixtures, decompression limits and decompression sickness risk.
Results are indicative only. The converter uses standard SI coefficients — for critical applications (medical, industrial) verify the result with a specialist.