Convert inch of water column to atmosphere
1 in w.g. = 0.002458316391 atm
1 in w.g. = 0.00246 atm
1 in w.g. in every pressure unit
| pascal | 249 Pa |
| kilopascal | 0.249 kPa |
| megapascal | 0.000249 MPa |
| bar | 0.00249 bar |
| atmosphere | 0.00246 atm |
| millimeter of mercury | 1.87 mmHg |
| pound per square inch | 0.0361 psi |
| foot of water column | 0.0833 ft H₂O |
| gigapascal | 2.49e-07 GPa |
| kip per square inch | 0.0000361 ksi |
| inch of mercury | 0.0736 inHg |
| inch of water column | 1 in w.g. |
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