Convert Kilopascals to Inches of Water
Convert Kilopascals (kPa) to Inches of Water (inH₂O) instantly and accurately.
Conversion Formula
inH₂O = kPa × 4.01463076
About Kilopascals
A kilopascal (kPa) = 1,000 Pa - the practical everyday SI pressure unit for moderate pressures. Car tyre inflation: 200-250 kPa (29-36 psi); truck tyres 550-830 kPa. Blood pressure in SI countries: 16/10.7 kPa (= 120/80 mmHg). Systolic blood pressure 16 kPa. Carbonated beverages are packaged at 200-500 kPa CO₂. Medical oxygen cylinders at 15,000 kPa; scuba cylinders 200-300 bar = 20,000-30,000 kPa. 1 kPa = 1,000 Pa = 0.01 bar = 0.145 psi.
About Inches of Water
One inch of water column (inH₂O or in WC) = pressure from 1 inch of fresh water at standard gravity ≈ 249.09 Pa. The standard unit for low-pressure measurement in US HVAC and plumbing: ductwork static pressure, fan performance, filter ratings, and gas appliance manifold pressures are all specified in inches WC. Household natural gas supply pressure is typically 7 in WC (0.25 psi). Blower door tests for building air-tightness use 50 Pa ≈ 0.2 in WC test pressure. 1 inH₂O = 249.089 Pa.
Quick Reference Table
| Kilopascals (kPa) | Inches of Water (inH₂O) |
|---|---|
| 1 kPa | 4.01463 inH₂O |
| 2 kPa | 8.02926 inH₂O |
| 5 kPa | 20.0732 inH₂O |
| 10 kPa | 40.1463 inH₂O |
| 25 kPa | 100.366 inH₂O |
| 50 kPa | 200.732 inH₂O |
| 100 kPa | 401.463 inH₂O |