Convert Inches of Water to Bars
Convert Inches of Water (inH₂O) to Bars (bar) instantly and accurately.
Conversion Formula
bar = inH₂O × 0.0024908891
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 Bars
A bar = exactly 100,000 Pa ≈ 0.987 atm - the world standard for industrial pressure outside North America. Hydraulic systems, pneumatic equipment, gas cylinders, dive computers, and tyre gauges in Europe and Asia use bar. Scuba diving: +1 bar per 10 m depth; at 40 m recreational limit = 5 bar absolute. European tyre pressure labels show bar alongside kPa. Industrial processes: steam at 10-50 bar; high-pressure reactors 100-300 bar; water-jet cutting 1,000-4,000 bar. 1 bar = 100,000 Pa = 14.504 psi.
Quick Reference Table
| Inches of Water (inH₂O) | Bars (bar) |
|---|---|
| 1 inH₂O | 0.00249089 bar |
| 2 inH₂O | 0.00498178 bar |
| 5 inH₂O | 0.0124544 bar |
| 10 inH₂O | 0.0249089 bar |
| 25 inH₂O | 0.0622722 bar |
| 50 inH₂O | 0.124544 bar |
| 100 inH₂O | 0.249089 bar |