# Atmosphere (standard) conversions

pressure conversions » atmosphere (standard) conversionsThe atmosphere (standard) conversion selector above selects the pressure/stress measurement unit to convert to starting from atmospheres (standard) (atm). To make a conversion starting from a unit of pressure other than atmosphere (standard), simply click on the "Reset" button.

## What is atmosphere (standard)?

The standard **atmosphere** is a unit of pressure equal to 101,325 pascals (1 atm = 101,325 Pa), the SI derived unit of pressure. It is also equal to 1,013.25 hectopascals (hPa), or 101.325 kilopascals (kPa), or about 1.033227453 technical atmosphere (at), or 1.01325 bars (bar), or 760 millimeters of mercury at 0 °C (mmHg), or 406.782 inches of water at 4 °C (inH2O), or 14.69595 pounds per square inch (psi), or 2,116.21662 pounds per square foot (psf) or 760 torr (Torr).

The standard atmosphere is equal to 1,013,250 dynes per square centimeter (1 atm = 1,013,250 dyn/cm²). The dyne (dyn) is a unit of force in the centimetre-gram-second (CGS) system of units while the square centimeter (cm²) is a unit of area in the SI.

In chemistry, the International Union of Pure and Applied Chemistry (IUPAC) recommends that the physical properties of substances be specified at "the standard pressure" rather than at "one standard atmosphere". In this regard "the standard pressure" is defined as exactly 100 kilopascals (or 1 bar).

The standard atmosphere is used in science, engineering, and the aerospace and petroleum industries.

*Note:*

The SI is an abbreviation for the International System of Units.

*Symbol:*

atm

*Plural:*

atmospheres (standard)

## Atmosphere (standard) conversions: quick access

A detailed list with conversions from atmospheres (standard) to other (metric, imperial, or customary) pressure and stress measurement units is shown below.

- atmosphere (standard) to atmosphere (technical) (atm to at)
- atmosphere (standard) to bar (atm to bar)
- atmosphere (standard) to barye (atm to Ba)
- atmosphere (standard) to centibar (atm to cbar)
- atmosphere (standard) to centimeter of mercury (atm to cmHg)
- atmosphere (standard) to centimeter of water (atm to cmH2O)
- atmosphere (standard) to decibar (atm to dbar)
- atmosphere (standard) to dyne per square centimeter (atm to dyn/cm²)
- atmosphere (standard) to gigabar (atm to Gbar)
- atmosphere (standard) to gigapascal (atm to GPa)
- atmosphere (standard) to hectopascal (atm to hPa)
- atmosphere (standard) to inch of mercury (atm to inHg)
- atmosphere (standard) to inch of water (atm to inH2O)
- atmosphere (standard) to kilobar (atm to kbar)
- atmosphere (standard) to kilogram-force per square centimeter (atm to kgf/cm²)
- atmosphere (standard) to kilogram-force per square millimeter (atm to kgf/mm²)
- atmosphere (standard) to kilopascal (atm to kPa)
- atmosphere (standard) to kip per square inch (atm to ksi)
- atmosphere (standard) to megabar (atm to Mbar)
- atmosphere (standard) to megapascal (atm to MPa)
- atmosphere (standard) to millibar (atm to mbar)
- atmosphere (standard) to millimeter of mercury (atm to mmHg)
- atmosphere (standard) to millimeter of water (atm to mmH2O)
- atmosphere (standard) to millipascal (atm to mPa)
- atmosphere (standard) to newton per square meter (atm to N/m²)
- atmosphere (standard) to newton per square millimeter (atm to N/mm²)
- atmosphere (standard) to pascal (atm to Pa)
- atmosphere (standard) to pieze (atm to pz)
- atmosphere (standard) to pound per square foot (atm to psf)
- atmosphere (standard) to pound per square inch (atm to psi)
- atmosphere (standard) to torr (atm to Torr)