Pressure Converter

Convert between Pascal, kPa, MPa, bar, PSI, atmospheres, mmHg, and inches of mercury. Covers SI units, engineering, weather, and medical pressure measurements.

Value

From Unit

How Pressure Conversion Works

Result = value × (from factor in Pa) ÷ (to factor in Pa)

The Pascal (Pa) is the SI base unit of pressure, defined as one newton per square meter. All conversions pass through Pascals as the intermediate unit. For example, 1 atm = 101,325 Pa and 1 PSI = 6,894.757 Pa.

Common Pressure Conversions

1 atm

101.325 kPa

1 atm

14.696 PSI

1 atm

760 mmHg

32 PSI

220.6 kPa (tire)

1 bar

14.504 PSI

120 mmHg

16.0 kPa (systolic)

Frequently Asked Questions

How do I convert PSI to bar?

Divide PSI by 14.5038 to get bar. So 30 PSI = 30 ÷ 14.5038 ≈ 2.07 bar. To go the other way, multiply bar by 14.5038. Tire pressure in Europe is typically listed in bar, while PSI is standard in North America.

How do I convert kPa to PSI?

Divide kPa by 6.89476 to get PSI. So 200 kPa = 200 ÷ 6.89476 ≈ 29.0 PSI. To convert PSI to kPa, multiply by 6.89476. Many vehicle tire placard pressures in metric countries use kPa.

What is 1 atmosphere of pressure?

1 standard atmosphere (1 atm) equals 101,325 Pascals, 101.325 kPa, 14.696 PSI, 1.01325 bar, or 760 mmHg. It represents the average atmospheric pressure at sea level. Atmospheric pressure decreases with altitude — at 5,500 m (18,000 ft) it is roughly half of the sea-level value.

What does blood pressure in mmHg mean?

Blood pressure is measured in millimeters of mercury (mmHg), a unit dating from early sphygmomanometers that used mercury columns. A reading of 120/80 mmHg means the systolic (peak) pressure is 120 mmHg and the diastolic (resting) pressure is 80 mmHg. Normal blood pressure is considered below 120/80 mmHg.