Convert Inches of Water to Megapascals
Convert Inches of Water (inH₂O) to Megapascals (MPa) instantly and accurately.
Conversion Formula
MPa = inH₂O × 0.00024908891
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.
About Megapascals
A megapascal (MPa) = 10⁶ Pa = 10 bar - standard unit for mechanical stress, material strength, and high-pressure engineering. Structural material yield strengths: mild steel 250-550 MPa; high-strength steel to 2,000 MPa; carbon fibre composites 1,500-7,000 MPa tensile. Hydraulic press pressures 50-200 MPa. Mariana Trench floor ~110 MPa. Concrete compressive strength: 25-40 MPa (normal); up to 150 MPa (high-performance). Water-jet cutting: 200-600 MPa. Elastic moduli in FEM analysis are in MPa or GPa. 1 MPa = 10⁶ Pa = 145.0 psi.
Quick Reference Table
| Inches of Water (inH₂O) | Megapascals (MPa) |
|---|---|
| 1 inH₂O | 0.000249089 MPa |
| 2 inH₂O | 0.000498178 MPa |
| 5 inH₂O | 0.00124544 MPa |
| 10 inH₂O | 0.00249089 MPa |
| 25 inH₂O | 0.00622722 MPa |
| 50 inH₂O | 0.0124544 MPa |
| 100 inH₂O | 0.0249089 MPa |