Convert Pascals (Pa) to and from kPa, MPa, bar, atm, psi, and mmHg. The SI unit of pressure made easy.
This pascal pressure converter converts pressure values between Pa and the larger units that appear in science, engineering, medicine, and everyday measurement systems.
The pascal is the SI base unit of pressure, defined as one newton per square meter. Because it is a small unit, it shows up directly in low-pressure calculations such as airflow, fluid statics, and sensor output, while larger scales like kPa and MPa are used for bigger loads.
Use the page when you want to move cleanly between the SI base unit and the larger pressure scales used by gauges, standards, and technical documentation. It is most helpful when a calculation starts in Pa because that is how the equation is written, but the decision you need to make depends on comparing the result with a gauge, atmospheric reference, or equipment limit shown in another unit. That translation step is common in labs, controls work, HVAC balancing, and sensor calibration.
It is useful whenever a formula, sensor, or scientific source gives pressure in pascals but the practical comparison you need is in kPa, bar, psi, or atm. That is common in physics classes, lab work, and instrumentation. A converter saves time because most real readings are easier to interpret once the tiny SI base unit has been restated on a larger scale.
Pascal Pressure Converter uses standard pressure conversion factors between Pa, kPa, bar, atm, psi, mmHg, and other units. All conversions are based on the SI definition: 1 Pa = 1 N/m².
Result: See calculator output
Enter any value and select units to see instant conversions across all supported pressure units.
Pressure is force distributed over area, and the pascal is the SI expression of that relationship: one newton per square meter. It is the reference point from which other pressure units are derived, which is why many equations and sensor specifications start in Pa even when the final reported value is shown in a different unit.
A single pascal is a small amount of pressure, so everyday and industrial values are usually reported in kPa, MPa, bar, or psi. Atmospheric pressure at sea level is already about 101,325 Pa, which shows why raw pascals can become cumbersome for larger systems.
Despite that, Pa remains useful for low-pressure and precise measurement work. Airflow, differential pressure sensors, building pressure balance, and some fluid calculations are often naturally expressed in pascals or kilopascals, so converting from the SI base unit is a routine task.
Common pressure units include pascals and kilopascals in science, psi in US industry, bar in European industry, atmospheres in chemistry, and mmHg in medicine. Pa is the SI base unit behind all of those conversions.
All pressure units can be converted through Pascals as the base unit. For example, to convert psi to bar: first convert psi to Pa (multiply by 6,894.76), then convert Pa to bar (divide by 100,000).
Standard atmospheric pressure is defined as 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.696 psi = 760 mmHg = 1 atm = 29.92 inHg.
Absolute pressure is measured from perfect vacuum (0 Pa). Gauge pressure is measured from atmospheric pressure. Absolute = Gauge + Atmospheric. A tire gauge reading 32 psig means 32 + 14.7 = 46.7 psia.
Different fields developed their own convenient units historically. Medicine uses mmHg (from mercury manometers), US industry uses psi (imperial system), science uses Pa (SI system), and diving uses atm (intuitive for depth calculations).
Atmospheric pressure decreases about 12% per 1,000 meters of altitude gain. Sea level: 101.3 kPa. Denver (1,600m): 83.5 kPa. Mt Everest (8,849m): 33.7 kPa.