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# Barometric Pressure - Pressure in psi, psf and kPa

Relation between barometric pressure in inches Hg - Mercury - and pressure in pounds per square inch and pound per square foot are indicated below:

Barometric Pressure in psi vs. psf vs. kPa
Barometer
(inches Hg)
Pressure
(psi)

Pressure
(psf)
28.00 13.75 1980
28.25 13.87 1997
28.50 13.99 2015
28.75 14.12 2033
29.00 14.24 2050
29.25 14.36 2069
29.50 14.48 2086
29.75 14.61 2103
29.92* 14.7 2116
30.00 14.75 2121
30.25 14.85 2139
30.50 14.98 2156
30.75 15.10 2174
31.00 15.22 2192
31.25 15.34 2210

* NTP - Standard Atmosphere

• 1 psi (lb/in2) = 144 psf (lbf/ft2) = 6894.8 Pa (N/m2) = 6.895x10-2 bar = 27.71 in H2O at 62oF (16.7oC) = 703.1 mm H2O at 62oF (16.7oC)

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International standard atmosphere in elevation -2000 to 30000 metre - pressure, temperature, density, viscosity, thermal conductivity and velocity of sound.

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Pressure vs. head units - like lb/in2, atm, inches mercury, bars, Pa and more.

### Pressure Units - Online Converter

Convert between pressure units like Pa,  bar, atmosphere, pound square feet, psi and more.

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Properties of the US standard atmosphere ranging -5000 to 250000 ft altitude.

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