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
| pascal | 2,990 Pa |
| kilopascal | 2.99 kPa |
| megapascal | 0.00299 MPa |
| bar | 0.0299 bar |
| atmosphere | 0.0295 atm |
| millimeter of mercury | 22.4 mmHg |
| pound per square inch | 0.434 psi |
| foot of water column | 1 ft H₂O |
| gigapascal | 0.00000299 GPa |
| kip per square inch | 0.000434 ksi |
| inch of mercury | 0.883 inHg |
| inch of water column | 12 in w.g. |
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