Pressure Converter
Convert between pascals, bar, atmospheres, PSI, and mmHg.
So funktioniert's
This converter handles pressure across scientific, industrial, and everyday units â pascals, kilopascals, bar, atmospheres, PSI, and mmHg â converting through pascals (the SI unit) as the common base.
PSI (pounds per square inch) is the everyday unit most familiar in the US, showing up on tire pressure gauges, bike pumps, and plumbing specifications. Bar is common internationally for similar everyday uses, particularly for tire pressure and general industrial equipment, with 1 bar â 14.5 PSI.
Atmospheres (atm) represent standard sea-level atmospheric pressure â 1 atm is defined as 101,325 pascals, providing an intuitive reference point ("twice atmospheric pressure" is easier to picture than an equivalent number in pascals for many practical purposes).
mmHg (millimeters of mercury) is the traditional unit for blood pressure readings and some meteorological and vacuum measurements, dating back to mercury-column pressure gauges â a normal blood pressure reading like 120/80 refers to 120 and 80 mmHg for systolic and diastolic pressure respectively.
For everyday reference: standard car tire pressure is typically 30-35 PSI (about 2.1-2.4 bar), while a typical home water pressure is around 40-60 PSI (about 2.8-4.1 bar) â useful benchmarks for sanity-checking a converted value against a familiar real-world scale.
Pressure, at its core, is simply force distributed over an area â the same total force applied over a smaller area produces higher pressure, which is why a sharp knife (small contact area) cuts more easily than a dull one (larger contact area) with the same push force behind it. This underlying physics is what every pressure unit here, however different they look, is ultimately measuring.
How many PSI are in 1 bar?
1 bar â 14.5038 PSI.
What does pressure actually measure at a physical level?
Pressure is force distributed over an area (force Ă· area) â the same force concentrated on a smaller area produces higher pressure, which is the underlying physical concept every pressure unit represents.
Why do weather reports sometimes use hectopascals or millibars?
Both are metric-adjacent units convenient for the small pressure variations relevant to weather (hectopascals and millibars are numerically equal, and typical atmospheric pressure hovers around 1,013 of either unit) â this converter's pascal and kilopascal units cover the same underlying scale.
What is standard atmospheric pressure?
1 atmosphere (atm) is defined as exactly 101,325 pascals, representing typical air pressure at sea level.
Why is tire pressure measured in PSI in the US but bar elsewhere?
It's a regional convention difference â PSI is standard in the US customary measurement system, while bar is more common internationally alongside the metric system, though both measure the same physical quantity.
What is mmHg used for besides blood pressure?
Millimeters of mercury is also used in some meteorological, vacuum, and scientific pressure measurements, tracing back to historical mercury-column pressure gauges.
What's a typical car tire pressure in PSI and bar?
Typically 30-35 PSI, which converts to roughly 2.1-2.4 bar â though the correct pressure for a specific vehicle is listed on the driver's door frame or in the owner's manual.
How many pascals are in 1 PSI?
1 PSI â 6,894.76 pascals.
Why is pascal the standard scientific unit for pressure?
Pascal is the SI (International System of Units) derived unit for pressure, defined as one newton of force per square meter â making it consistent with other SI units used throughout physics and engineering.
How precise are these pressure conversions?
Fully precise, using each unit's exact defined relationship to pascals, limited only by the display precision shown.
Can I convert between more than two pressure units at once?
Yes â the "Quick reference" table below the main converter shows your entered value converted into every other supported pressure unit simultaneously.