inH2O to kPa converter
1 inH2O = 0.249082 kPa
And 1 kPa = 4.01474 inH2O. Inches of water column to kilopascal.
Formula
kPa = inH2O × 0.249082
A reading of 15 inH2O is 15 × 0.249082 = 3.73623 kPa.
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 |
| 100 inH2O | 24.9082 kPa |
| 500 inH2O | 124.541 kPa |
| 1,000 inH2O | 249.082 kPa |
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 |
About these units
inH2O (inches of water column): Low duct and furnace pressures, at the conventional 4 °C water reference.
kPa (kilopascal): Common for HVAC, building ventilation and low-pressure gas work.
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 kPa to inH2O instead · All pressure and stress conversions