Direct conversion
Convert inches of water column to pascals for HVAC static pressure, fan curves, filters, duct systems, laboratory instruments, and low-pressure specifications.
1 inch of water [inH2O] = 249.08891 pascal [Pa]
1 inch of water [inH2O] = 249.08891 pascal [Pa]
Multiply inH₂O by approximately 249.08891 to get pascals.
Example: 1 inch of water [inH2O] equals 249.08891 pascal [Pa].
Pressure conversions use pascal as the reference unit and include common engineering, weather, tire, and laboratory pressure units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-08-14.
The inch of water (inH2O) is a pressure unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse inch of water when comparing pressure values, checking specifications, converting between systems, or preparing quick estimates.
The pascal is the SI derived unit of pressure equal to one newton per square meter.
HistoryThe pascal is named after Blaise Pascal and is the standard SI pressure unit.
Current usePascals are used in science, engineering, materials testing, weather, acoustics, and fluid mechanics.
| inch of water [inH2O] | pascal [Pa] |
|---|---|
| 1 | 249.08891 |
| 2 | 498.17782 |
| 5 | 1245.44455 |
| 10 | 2490.8891 |
| 20 | 4981.7782 |
| 25 | 6227.22275 |
| 50 | 12454.4455 |
| 100 | 24908.891 |
| 1000 | 249088.91 |
Use this formula: 1 inch of water [inH2O] = 249.08891 pascal [Pa] Enter your value in the calculator and the result updates instantly.
1 inch of water [inH2O] equals 249.08891 pascal [Pa].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.
1 inch of water column is approximately 249.08891 pascals using this stored reference factor.
It is convenient for relatively small pressure differences such as duct static pressure and fan pressure.