Convert Pascals to Inches of Water
Convert Pascals (Pa) to Inches of Water (inH₂O) instantly and accurately.
Conversion Formula
inH₂O = Pa × 0.00401463076
About Pascals
The pascal (Pa) is the SI unit of pressure - 1 N/m², named after Blaise Pascal (1623-1662). Standard sea-level atmosphere ≈ 101,325 Pa. One pascal is very small: roughly the pressure of a single banknote lying flat. Pascal is simultaneously the SI unit for mechanical stress and elastic modulus: structural steel Young's modulus ~200 GPa; rubber shear modulus ~0.5 MPa. Used universally in fluid mechanics, acoustics, atmospheric science, and materials engineering. 1 Pa = 1 N/m².
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
| Pascals (Pa) | Inches of Water (inH₂O) |
|---|---|
| 1 Pa | 0.00401463 inH₂O |
| 2 Pa | 0.00802926 inH₂O |
| 5 Pa | 0.0200732 inH₂O |
| 10 Pa | 0.0401463 inH₂O |
| 25 Pa | 0.100366 inH₂O |
| 50 Pa | 0.200732 inH₂O |
| 100 Pa | 0.401463 inH₂O |