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# Altitude Pressure

This calculator uses barometric formula to find out the pressure at the given altitude

The equation for the variation of barometric pressure with height, called barometric formula, has the form
$P=P_0e^{\frac{-\mu gh}{RT}}$,
where
$\mu$ - Molar mass of Earth's air, 0.0289644 kg/mol
$g$ - Gravitational acceleration, 9.80665 m/(s*s)
$h$ - Height difference, meters
$R$ - Universal gas constant for air, 8.31432 N·m /(mol·K)
$T$ - Air temperature, К

Default value for $P_0$ is 760 mmHg, i.e. standard barometric pressure, 101.325 kPa or 1 atmosphere. It also corresponds to 0 meters above sea level and can be left as is. Change the height (altitude above sea level) and temperature and get the results. Note, that this is theoretical value, in reality, atmosphere pressure is dependant not only on altitude and temperature, but on other factors such as humidity and weather conditions.

### Altitude Pressure

Altitude Pressure (mmHg)

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