Pressure is measured in units such as bar, psi, kPa, MPa, Pa, atm, mmHg. Pick a source and target unit above, enter a value, and the result appears instantly — free and entirely in your browser. Below you'll find the most common individual conversions as dedicated pages.
Which pressure units are there?
- Bar (bar) — The bar is a metric pressure unit equal to exactly 100,000 pascals — very close to average air pressure at sea level. It is widely used across Europe for tyre pressure, weather reports and industrial systems.
- Pound per square inch (psi) — Pounds per square inch (psi) is the imperial pressure unit common in the US and UK, used for tyre pressure, air compressors and hydraulics. One psi equals about 6,895 pascals.
- Kilopascal (kPa) — The kilopascal (kPa) equals 1,000 pascals and is the SI-based unit most used in science, engineering and many vehicle manuals outside the United States.
- Megapascal (MPa) — The megapascal (MPa) equals one million pascals, or 10 bar. It is used for material strength, high-pressure hydraulics and concrete specifications.
- Pascal (Pa) — The pascal (Pa) is the SI unit of pressure: one newton per square metre. It is small for everyday use, so multiples like kPa, bar and MPa are far more common.
- Standard atmosphere (atm) — The standard atmosphere (atm) is defined as exactly 101,325 pascals — roughly the average air pressure at sea level. It serves as a reference value in chemistry and physics.
- Millimeter of mercury (mmHg) — The millimetre of mercury (mmHg), also called torr, equals about 133.322 pascals. It survives mainly in medicine for blood pressure and in vacuum technology.
Key facts about pressure
Pressure units differ by region and field: Europe uses bar, the US uses psi, science uses pascals and kilopascals, and medicine still uses mmHg. Converting between them is a daily need for mechanics, engineers and divers.
Standard atmospheric pressure is defined as exactly 101,325 Pa — equal to 1.01325 bar or 14.696 psi (BIPM/NIST). Car tyres are typically inflated to about 2.2–2.5 bar (32–36 psi).
How to use the pressure converter
- Pick the source unit and enter the pressure value.
- Pick the target unit — the result appears instantly.
- Use the swap button to reverse the direction.
Everything runs locally in your browser — no uploads, no waiting, no limits, and it even works offline.