Convert inch of water column to kilopascal
1 in w.g. = 0.2490889083 kPa
| 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 0.2490889083 to go from inch of water column to kilopascal, 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? kilopascal to inch of water column: 1 kPa = 4.014630787 in w.g..
| 1 in w.g. | 0.24908891 kPa |
| 2 in w.g. | 0.49817782 kPa |
| 3 in w.g. | 0.74726672 kPa |
| 5 in w.g. | 1.2454445 kPa |
| 10 in w.g. | 2.4908891 kPa |
| 15 in w.g. | 3.7363336 kPa |
| 20 in w.g. | 4.9817782 kPa |
| 25 in w.g. | 6.2272227 kPa |
| 50 in w.g. | 12.454445 kPa |
| 75 in w.g. | 18.681668 kPa |
| 100 in w.g. | 24.908891 kPa |
| 250 in w.g. | 62.272227 kPa |
| 500 in w.g. | 124.54445 kPa |
| 1000 in w.g. | 249.08891 kPa |