Convert inch of water column to atmosphere
1 in w.g. = 0.002458316391 atm
1 in w.g. = 0.0024583 atm
1 in w.g. in every pressure unit
| microbar | 2,490.9 μbar |
| barye | 2,490.9 Ba |
| millitorr | 1,868.3 mTorr |
| pascal | 249.09 Pa |
| millimeter of water column | 25.4 mmH₂O |
| pound per square foot | 5.2023 lb/ft² |
| centimeter of water column | 2.54 cmH₂O |
| hectopascal | 2.4909 hPa |
| millibar | 2.4909 mbar |
| torr | 1.8683 Torr |
| millimeter of mercury | 1.8683 mmHg |
| inch of water column | 1 in w.g. |
| kilopascal | 0.24909 kPa |
| foot of water column | 0.083333 ft H₂O |
| inch of mercury | 0.073556 inHg |
| pound per square inch | 0.036127 psi |
| meter of water column | 0.0254 m H₂O |
| decibar | 0.024909 dbar |
| kilogram-force per square centimeter | 0.00254 kgf/cm² |
| bar | 0.0024909 bar |
| atmosphere | 0.0024583 atm |
| megapascal | 0.00024909 MPa |
| kip per square inch | 0.000036127 ksi |
| gigapascal | 2.4909e-07 GPa |
| million pounds per square inch | 3.6127e-08 Mpsi |
How the conversion works
Multiply by 0.002458316391 to go from inch 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 inch of water column — 1 atm = 406.7824645 in w.g..
inch of water column to atmosphere — common values
| 1 in w.g. | 0.0024583164 atm |
| 2 in w.g. | 0.0049166328 atm |
| 3 in w.g. | 0.0073749492 atm |
| 5 in w.g. | 0.012291582 atm |
| 10 in w.g. | 0.024583164 atm |
| 15 in w.g. | 0.036874746 atm |
| 20 in w.g. | 0.049166328 atm |
| 25 in w.g. | 0.06145791 atm |
| 50 in w.g. | 0.12291582 atm |
| 75 in w.g. | 0.18437373 atm |
| 100 in w.g. | 0.24583164 atm |
| 250 in w.g. | 0.6145791 atm |
| 500 in w.g. | 1.2291582 atm |
| 1000 in w.g. | 2.4583164 atm |
Other pressure conversions
Pa → atmkPa → atmMPa → atmbar → atmpsi → atmmmHg → atminHg → atmft H₂O → atm