Convert between pascal, kPa, MPa, bar, psi, atm, and mmHg
Pressure is the force applied per unit area. The SI unit of pressure is the pascal (Pa), defined as one newton per square metre. Pressure measurements are used across a wide range of fields including engineering, medicine, meteorology, and everyday applications such as tyre inflation and cooking.
30 psi (typical car tyre pressure) equals approximately 2.07 bar or 206.8 kPa.
1 bar equals approximately 14.5 psi.
Standard blood pressure (120 mmHg systolic) equals approximately 16 kPa.
This pressure converter helps convert between the most common pressure units used in engineering, science, medicine, and everyday life. It covers pascal, kilopascal, megapascal, bar, psi, atmosphere, and millimetres of mercury.
Whether the task is checking tyre pressure in both psi and bar, converting kPa for a weather reading, or working out medical pressure values in mmHg and kPa, this page provides both an instant calculator and detailed reference information.
Pressure is defined as force per unit area:
P = F / A
where:
The most common pressure units are shown below.
| Unit | Symbol | Equivalent in Pascals (Pa) |
|---|---|---|
| Pascal | Pa | 1 Pa |
| Kilopascal | kPa | 1,000 Pa |
| Megapascal | MPa | 1,000,000 Pa |
| Bar | bar | 100,000 Pa |
| Pounds per square inch | psi | 6,894.757 Pa |
| Atmosphere | atm | 101,325 Pa |
| Millimetres of mercury | mmHg | 133.322 Pa |
Pressure unit conversion works by converting the input value into pascals and then converting from pascals into the target unit.
The calculator above handles this automatically and returns an immediate result.
1 atmosphere equals 101,325 pascals. This is the defined standard atmospheric pressure at sea level and is one of the most common reference points in pressure measurement.
1 bar equals 100,000 pascals. The bar is slightly less than standard atmospheric pressure and is widely used in meteorology and engineering.
Multiply the value in psi by 6.89476 to get kilopascals. For example, 32 psi (a typical car tyre pressure) equals approximately 220.6 kPa.
Millimetres of mercury (mmHg) is used primarily in medicine to measure blood pressure and in some meteorological contexts. Normal systolic blood pressure of 120 mmHg is approximately 16 kPa or 0.158 atm.
Tyre pressure is measured in psi in the US and UK and in bar or kPa in much of Europe. A typical car tyre inflated to 32 psi is approximately 2.2 bar or 220 kPa.
Blood pressure is almost universally reported in mmHg. Converting to kPa or Pa can be useful in scientific contexts or when using certain monitoring equipment.
Pressure cookers typically operate at around 15 psi (approximately 1 bar) above atmospheric pressure. Understanding the pressure in different units can help when following recipes from different regions.
Hydraulic systems, compressors, and industrial equipment may specify pressure in bar, psi, MPa, or kPa depending on the manufacturer and region.
Atmospheric pressure is commonly reported in hPa (hectopascal), millibars, or mmHg. Standard sea-level pressure is 1013.25 hPa, 1013.25 mbar, or 760 mmHg.
This tool is useful for fast calculations, practical reference, and checking formulas without doing manual conversions. It covers the most-used pressure units across automotive, medical, cooking, engineering, and scientific contexts.
Use the Pressure Converter above to convert pressure units instantly and explore more tools across ConvertUnitsNow.com.