Convert foot of water column to atmosphere
1 ft H₂O = 0.02949979669 atm
1 ft H₂O = 0.0295 atm
1 ft H₂O in every pressure unit
| microbar | 29,891 μbar |
| barye | 29,891 Ba |
| millitorr | 22,420 mTorr |
| pascal | 2,989.1 Pa |
| millimeter of water column | 304.8 mmH₂O |
| pound per square foot | 62.428 lb/ft² |
| centimeter of water column | 30.48 cmH₂O |
| hectopascal | 29.891 hPa |
| millibar | 29.891 mbar |
| torr | 22.42 Torr |
| millimeter of mercury | 22.42 mmHg |
| inch of water column | 12 in w.g. |
| kilopascal | 2.9891 kPa |
| foot of water column | 1 ft H₂O |
| inch of mercury | 0.88267 inHg |
| pound per square inch | 0.43353 psi |
| meter of water column | 0.3048 m H₂O |
| decibar | 0.29891 dbar |
| kilogram-force per square centimeter | 0.03048 kgf/cm² |
| bar | 0.029891 bar |
| atmosphere | 0.0295 atm |
| megapascal | 0.0029891 MPa |
| kip per square inch | 0.00043353 ksi |
| gigapascal | 0.0000029891 GPa |
| million pounds per square inch | 4.3353e-07 Mpsi |
How the conversion works
Multiply by 0.02949979669 to go from foot of water column to atmosphere, or divide by it to go back. Every conversion on this site routes through the SI value (Pa) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? atmosphere to foot of water column — 1 atm = 33.8985387 ft H₂O.
foot of water column to atmosphere — common values
| 1 ft H₂O | 0.029499797 atm |
| 2 ft H₂O | 0.058999593 atm |
| 3 ft H₂O | 0.08849939 atm |
| 5 ft H₂O | 0.14749898 atm |
| 10 ft H₂O | 0.29499797 atm |
| 15 ft H₂O | 0.44249695 atm |
| 20 ft H₂O | 0.58999593 atm |
| 25 ft H₂O | 0.73749492 atm |
| 50 ft H₂O | 1.4749898 atm |
| 75 ft H₂O | 2.2124848 atm |
| 100 ft H₂O | 2.9499797 atm |
| 250 ft H₂O | 7.3749492 atm |
| 500 ft H₂O | 14.749898 atm |
| 1000 ft H₂O | 29.499797 atm |
Other pressure conversions
Pa → atmkPa → atmMPa → atmbar → atmpsi → atmmmHg → atminHg → atmft H₂O → Pa