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Atmosphere to Pascal Converter

Convert atmosphere pascal between units instantly. Includes conversion tables, common equivalents, and calculation formulas.

Reviewed by Manoj Kumar, Mathematics Educator

Reviewed by Manoj Kumar, Mathematics Educator

Formula

Pa = atm x 101325 | 1 bar = 100000 Pa | 1 PSI = 6894.76 Pa

One standard atmosphere equals exactly 101,325 pascals. All pressure conversions use the pascal as the base SI unit. Key relationships: 1 bar = 100,000 Pa, 1 PSI = 6,894.76 Pa, 1 mmHg (torr) = 133.322 Pa, 1 inHg = 3,386.39 Pa. The pascal is defined as one newton per square meter.

Worked Examples

Example 1: Tire Pressure Conversion

Problem:Convert 32 PSI tire pressure to pascals and bar.

Solution:Pascals: 32 x 6,894.76 = 220,632.32 Pa\nKilopascals: 220,632.32 / 1000 = 220.63 kPa\nBar: 220,632.32 / 100,000 = 2.2063 bar\nAtmospheres: 220,632.32 / 101,325 = 2.178 atm

Result:32 PSI = 220,632 Pa = 2.21 bar

Example 2: Weather Pressure

Problem:A barometer reads 760 mmHg. What is this in pascals and atmospheres?

Solution:Pascals: 760 x 133.322 = 101,324.72 Pa\nAtmospheres: 101,324.72 / 101,325 = 1.0000 atm\nBar: 101,324.72 / 100,000 = 1.0132 bar

Result:760 mmHg = 101,325 Pa = 1.0 atm (standard pressure)

Frequently Asked Questions

How many pascals are in one atmosphere?

One standard atmosphere (atm) equals exactly 101,325 pascals (Pa) or 101.325 kilopascals (kPa). This value was defined by the International Union of Pure and Applied Chemistry (IUPAC) based on the average atmospheric pressure at sea level and 15 degrees Celsius. The pascal is the SI unit of pressure defined as one newton per square meter. Standard atmospheric pressure is used as a reference in chemistry, aviation, and meteorology.

What is a pascal and what is it used for?

A pascal (Pa) is the SI unit of pressure equal to one newton of force per square meter of area. Named after French mathematician Blaise Pascal, it is used in engineering, physics, meteorology, and material science. Because one pascal is a very small pressure (about 0.000145 psi), kilopascals (kPa) and megapascals (MPa) are more commonly used in practice. Tire pressure, blood pressure, and weather reports often use related units like bar, mmHg, or millibar.

References

Reviewed by Manoj Kumar, Mathematics Educator · Editorial policy