Direct conversion
Convert pascals to inches of water column when comparing metric pressure data with HVAC fan curves, duct measurements, filters, and manometer readings.
1 pascal [Pa] = 0.004015 inch of water [inH2O]
1 pascal [Pa] = 0.004015 inch of water [inH2O]
Divide pascals by approximately 249.08891, or multiply by about 0.00401463.
Example: 1 pascal [Pa] equals 0.004015 inch of water [inH2O].
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 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.
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.
| pascal [Pa] | inch of water [inH2O] |
|---|---|
| 1 | 0.004015 |
| 2 | 0.008029 |
| 5 | 0.020073 |
| 10 | 0.040146 |
| 20 | 0.080293 |
| 25 | 0.100366 |
| 50 | 0.200732 |
| 100 | 0.401463 |
| 1000 | 4.014631 |
Use this formula: 1 pascal [Pa] = 0.004015 inch of water [inH2O] Enter your value in the calculator and the result updates instantly.
1 pascal [Pa] equals 0.004015 inch of water [inH2O].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.
250 Pa is approximately 1.0037 inH₂O.
Divide pascals by approximately 249.08891.