Convert inch of water column to pascal
1 in w.g. = 249.0889083 Pa
| microbar | 2,490 μbar |
| barye | 2,490 Ba |
| millitorr | 1,870 mTorr |
| pascal | 249 Pa |
| millimeter of water column | 25.4 mmH₂O |
| pound per square foot | 5.2 lb/ft² |
| centimeter of water column | 2.54 cmH₂O |
| hectopascal | 2.49 hPa |
| millibar | 2.49 mbar |
| torr | 1.87 Torr |
| millimeter of mercury | 1.87 mmHg |
| inch of water column | 1 in w.g. |
| kilopascal | 0.249 kPa |
| foot of water column | 0.0833 ft H₂O |
| inch of mercury | 0.0736 inHg |
| pound per square inch | 0.0361 psi |
| meter of water column | 0.0254 m H₂O |
| decibar | 0.0249 dbar |
| kilogram-force per square centimeter | 0.00254 kgf/cm² |
| bar | 0.00249 bar |
| atmosphere | 0.00246 atm |
| megapascal | 0.000249 MPa |
| kip per square inch | 0.0000361 ksi |
| gigapascal | 2.49e-07 GPa |
| million pounds per square inch | 3.61e-08 Mpsi |
inch of water column: This is a very small pressure, about 1/28 of a psi, and its smallness is the point: a whole air handling system might operate at 2 in w.g. Confusing it with psi overstates duct pressure by a factor of 28. Note also that natural gas appliance manifold pressure is typically 3.5 in w.g. and propane 10 to 11 in w.g., so the unit is what a manometer on a gas valve is actually reading. Full definition →
Multiply by 249.0889083 to go from inch of water column to pascal, 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? pascal to inch of water column: 1 Pa = 0.004014630787 in w.g..
| 1 in w.g. | 249.08891 Pa |
| 2 in w.g. | 498.17782 Pa |
| 3 in w.g. | 747.26672 Pa |
| 5 in w.g. | 1,245.4445 Pa |
| 10 in w.g. | 2,490.8891 Pa |
| 15 in w.g. | 3,736.3336 Pa |
| 20 in w.g. | 4,981.7782 Pa |
| 25 in w.g. | 6,227.2227 Pa |
| 50 in w.g. | 12,454.445 Pa |
| 75 in w.g. | 18,681.668 Pa |
| 100 in w.g. | 24,908.891 Pa |
| 250 in w.g. | 62,272.227 Pa |
| 500 in w.g. | 124,544.45 Pa |
| 1000 in w.g. | 249,088.91 Pa |