kPa to inH2O converter
1 kPa = 4.01474 inH2O
And 1 inH2O = 0.249082 kPa. Kilopascal to inches of water column.
Formula
inH2O = kPa × 4.01474
A reading of 15 kPa is 15 × 4.01474 = 60.2211 inH2O.
kPa to inH2O table
| kPa | inH2O |
|---|---|
| 1 kPa | 4.01474 inH2O |
| 5 kPa | 20.0737 inH2O |
| 10 kPa | 40.1474 inH2O |
| 15 kPa | 60.2211 inH2O |
| 30 kPa | 120.442 inH2O |
| 50 kPa | 200.737 inH2O |
| 100 kPa | 401.474 inH2O |
| 500 kPa | 2,007.37 inH2O |
| 1,000 kPa | 4,014.74 inH2O |
inH2O to kPa table
| inH2O | kPa |
|---|---|
| 1 inH2O | 0.249082 kPa |
| 5 inH2O | 1.24541 kPa |
| 10 inH2O | 2.49082 kPa |
| 15 inH2O | 3.73623 kPa |
| 30 inH2O | 7.47246 kPa |
| 50 inH2O | 12.4541 kPa |
About these units
kPa (kilopascal): Common for HVAC, building ventilation and low-pressure gas work.
inH2O (inches of water column): Low duct and furnace pressures, at the conventional 4 °C water reference.
Gauge pressure (psig, barg) is measured relative to the surrounding atmosphere; absolute pressure (psia, bara) is relative to vacuum. Converting units never changes that reference: absolute = gauge + about 14.696 psi (1.01325 bar) at sea level. Stress uses the same units: 1 MPa = 1 N/mm².
Convert inH2O to kPa instead · All pressure and stress conversions