Pressure Converter - Convert Pressure Units

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Unit	Value	Actions
megapascal MPa
bar bar
kilogram per square centimeter kg/cm²
kilopascal kPa
hectopascal hPa
millibar mbar
kilogram per square meter kg/m²
pascal Pa

Unit	Value	Actions
kilopound per square inch ksi
pound per square inch psi
pound per square foot psf

Unit	Value	Actions
meter of mercury mHg
inch of mercury inHg
centimeter of mercury cmHg
millimeter of mercury mmHg

Unit	Value	Actions
meter of water mH₂O
inch of water inH₂O
centimeter of water cmH₂O

Unit	Value	Actions
standard atmosphere atm
technical atmosphere at

Common mistakes in pressure conversion

Tire pressure is quoted in bar in Europe and psi in the US: 1 bar is about 14.5 psi. The recommended 2.5 bar equals about 36 psi, inflating to '25 psi' on the assumption they match leaves the tire dangerously underinflated. Multiply bar by 14.5 to get psi.
One atmosphere is not exactly one bar: 1 atm = 1.01325 bar = 101.325 kPa. There is also the technical atmosphere (1 kgf/cm²) at about 0.981 bar. The ~1% differences rarely matter day to day, but engineering and diving calculations need the right unit.
Blood pressure uses mmHg (120/80) and weather reports use hPa (around 1,013), different units that must not be mixed: 760 mmHg = 1,013.25 hPa. One mmHg is about 1.33 hPa.
Hectopascals and millibars are exactly the same size: 1 hPa = 1 mbar. A chart showing 1,013 mbar and one showing 1,013 hPa agree perfectly, no conversion needed. Meteorology simply renamed the unit.

Quick conversion quiz

Score: 0

225 hectopascal equals 225 millibar.

Correct answer: 225 hectopascal = 225 millibar.

6.6 kilopascal equals 6.6e+3 pascal.

Correct answer: 6.6 kilopascal = 6.6e+3 pascal.

4.5 hectopascal equals 3.82 millibar.

Correct answer: 4.5 hectopascal = 4.5 millibar.

43 bar equals 6.45e+3 kilopascal.

Correct answer: 43 bar = 4.3e+3 kilopascal.

202 millibar equals 20.2 kilopascal.

Correct answer: 202 millibar = 20.2 kilopascal.

Definitions

bar (bar)

Metric unit, 100,000 pascals.

The bar is a metric unit of pressure, but not part of the International System of Units (SI). It is defined as exactly 100,000 Pa (100 kPa). It is slightly less than the current average atmospheric pressure on Earth at sea level.

hectopascal (hPa)

Equivalent to millibar. Used in meteorology.

The hectopascal (hPa) is equal to 100 pascals or 1 millibar. It is the international standard unit for measuring atmospheric pressure in meteorology.

pascal (Pa)

The SI derived unit of pressure.

The pascal (Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus, and ultimate tensile strength. It is defined as one newton per square meter.

pound per square inch (psi)

Imperial/US unit. Common for tire pressure.

Pounds per square inch (PSI) is a unit of pressure resulting from a force of one pound-force applied to an area of one square inch. It is widely used in the US and UK, particularly for tire pressure.

standard atmosphere (atm)

Standard pressure at sea level.

The standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 Pa. It approximates the average atmospheric pressure on Earth at sea level.

Frequently asked questions

What is the difference between bar and psi?

Bar is a metric pressure unit, while psi is pounds per square inch. 1 bar is about 14.5038 psi.

How do I convert psi to bar?

Divide psi by 14.5038. Example: 30 psi ÷ 14.5038 ≈ 2.07 bar.

How do I convert bar to psi?

Multiply bar by 14.5038. Example: 2.5 bar × 14.5038 ≈ 36.26 psi.

What is the difference between gauge pressure and absolute pressure?

Gauge pressure is relative to atmospheric pressure (typical tire gauge). Absolute pressure is measured from a perfect vacuum and includes atmospheric pressure.

How do I convert kPa to bar?

1 bar equals 100 kPa exactly. So divide kPa by 100 to get bar.

Why do tire pressure numbers look different in psi and bar?

They’re the same pressure in different units. The number changes because psi and bar have different scales.

How do I use the pressure converter on konvertera.nu?

Enter your pressure value (like psi), choose the target unit (like bar), and konvertera.nu converts it instantly.

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