Convert kilopascal to inch of water column
1 kPa = 4.014630787 in w.g.
| microbar | 10,000 μbar |
| barye | 10,000 Ba |
| millitorr | 7,500 mTorr |
| pascal | 1,000 Pa |
| millimeter of water column | 102 mmH₂O |
| pound per square foot | 20.9 lb/ft² |
| centimeter of water column | 10.2 cmH₂O |
| hectopascal | 10 hPa |
| millibar | 10 mbar |
| torr | 7.5 Torr |
| millimeter of mercury | 7.5 mmHg |
| inch of water column | 4.01 in w.g. |
| kilopascal | 1 kPa |
| foot of water column | 0.335 ft H₂O |
| inch of mercury | 0.295 inHg |
| pound per square inch | 0.145 psi |
| meter of water column | 0.102 m H₂O |
| decibar | 0.1 dbar |
| kilogram-force per square centimeter | 0.0102 kgf/cm² |
| bar | 0.01 bar |
| atmosphere | 0.00987 atm |
| megapascal | 0.001 MPa |
| kip per square inch | 0.000145 ksi |
| gigapascal | 0.000001 GPa |
| million pounds per square inch | 1.45e-07 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 4.014630787 to go from kilopascal to inch of water column, 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? inch of water column to kilopascal: 1 in w.g. = 0.2490889083 kPa.
| 1 kPa | 4.0146308 in w.g. |
| 2 kPa | 8.0292616 in w.g. |
| 3 kPa | 12.043892 in w.g. |
| 5 kPa | 20.073154 in w.g. |
| 10 kPa | 40.146308 in w.g. |
| 15 kPa | 60.219462 in w.g. |
| 20 kPa | 80.292616 in w.g. |
| 25 kPa | 100.36577 in w.g. |
| 50 kPa | 200.73154 in w.g. |
| 75 kPa | 301.09731 in w.g. |
| 100 kPa | 401.46308 in w.g. |
| 250 kPa | 1,003.6577 in w.g. |
| 500 kPa | 2,007.3154 in w.g. |
| 1000 kPa | 4,014.6308 in w.g. |