Pressure Converter
Convert between Pa, bar, psi, atm, and more.
How to Use Pressure Converter
- 1Enter a pressure value
- 2Select the source unit
- 3See all other unit equivalents instantly
About Pressure Converter
The Pressure Converter converts between all common pressure units: pascals, kilopascals, megapascals, bar, millibar, psi, atmospheres, mmHg (torr), and inHg. Enter any pressure value and see all other equivalents displayed simultaneously.
The converter covers every major pressure domain: pascals for scientific SI work, bar and psi for industrial and automotive contexts, atmospheres for chemistry and diving, mmHg for medical blood pressure readings, and millibar for meteorological weather maps.
All processing runs in your browser with no server calls. Whether you are a physicist, engineer, meteorologist, or diver checking equipment pressure, the tool delivers accurate conversions instantly.
Key Features of Pressure Converter
- Convert between Pa, kPa, and MPa (SI pressure units)
- Convert between bar and mbar (meteorological and industrial units)
- Convert between psi (pounds per square inch for engineering)
- Convert between atm (standard atmospheres for chemistry)
- Includes mmHg (torr) for blood pressure and lab use
- Includes inHg for weather and aviation altimetry
- All equivalents shown simultaneously in one view
- Instant results as you type
Supported Formats
Input Formats
Output Formats
1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg = 29.921 inHg. 1 bar = 100,000 Pa.
Examples
Convert atmospheric pressure to psi
Convert 1 standard atmosphere to psi for an engineering reference.
Input
1 atm
Output
14.696 psi | 101,325 Pa | 1.01325 bar | 760 mmHg
Convert tire pressure from psi to bar
Convert a tire pressure of 32 psi to bar for a European-spec gauge.
Input
32 psi
Output
2.206 bar | 220.6 kPa | 2.18 atm
Common Use Cases
- Converting tire pressure between psi and bar for international vehicles
- Converting blood pressure readings between mmHg and kPa for medical forms
- Weather analysis: converting millibar to inHg for aviation altimetry
- Chemical engineering: converting pressure between bar and MPa
- Scuba diving depth pressure calculations in atm and bar
- Physics and laboratory work requiring SI Pascal conversions
Troubleshooting
Confusing gauge pressure with absolute pressure
Solution
This converter uses absolute pressure (measured from zero, i.e., vacuum). Gauge pressure (measured relative to atmospheric pressure) requires adding 1 atm (101.325 kPa) to the reading. Tire pressures are typically gauge pressures.
Using mmHg for barometric pressure when inHg is expected
Solution
Aviation altimeters in the US use inHg (e.g., 29.92 inHg). European aviation uses hPa/mbar. Blood pressure readings use mmHg. Always check which unit your instrument or standard requires.
Confusing mbar with mmHg
Solution
1 mbar = 0.750 mmHg. They are similar in magnitude but not equal. Millibar is used in meteorology; mmHg is used in medicine and vacuum science.
Frequently Asked Questions
Which pressure units are supported?
Pascal (Pa), kilopascal (kPa), megapascal (MPa), bar, millibar (mbar), psi, atmosphere (atm), millimeter of mercury (mmHg / Torr), and inch of mercury (inHg).
What is standard atmospheric pressure?
1 standard atmosphere (atm) = 101,325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg = 29.921 inHg. This is the reference pressure at sea level.
What is the difference between bar and psi?
1 bar = 14.504 psi. Bar is the metric unit commonly used in Europe and engineering; psi (pounds per square inch) is the imperial unit commonly used in the US for tire pressure and hydraulics.
What is mmHg used for?
mmHg (millimeters of mercury) is used for blood pressure readings (e.g., 120/80 mmHg), atmospheric pressure in weather science, and vacuum pressure in laboratories.
What is the difference between Pa and kPa?
1 kPa = 1,000 Pa. Pascals are very small units (1 Pa is about the pressure of a dollar bill lying flat). Kilopascals are used for tire pressure, blood pressure in some countries, and weather.
What is Torr?
Torr and mmHg are effectively the same unit (1 Torr = 1 mmHg to very high precision). Torr is often used in vacuum science and high-precision laboratory settings.
What is gauge vs absolute pressure?
Absolute pressure is measured from a perfect vacuum (zero). Gauge pressure is measured relative to atmospheric pressure. Tire pressure gauges show gauge pressure; add 1 atm to get absolute pressure.
Is my data private?
Yes. All conversions run entirely in your browser. No values are transmitted to any server.