How to convert pascals to inches of water
inH₂O = Pa × 0.00401463076Multiply the value in pascals by 0.00401463076. To go the other way, multiply by 249.08891 (or divide by 0.00401463076).
A pascal is smaller than an inch of water: it takes 249.08891 pascals to make one inch of water.
Worked examples
- 1 pascal1 Pa × 0.00401463076 = 0.00401463076 inH₂O
- 5 pascals5 Pa × 0.00401463076 = 0.0200731538 inH₂O
- 10 pascals10 Pa × 0.00401463076 = 0.0401463076 inH₂O
- 20 pascals20 Pa × 0.00401463076 = 0.0802926152 inH₂O
- 100 pascals100 Pa × 0.00401463076 = 0.401463076 inH₂O
Pascals to inches of water conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Pascals (Pa) | Inches of water (inH₂O) |
|---|---|
| 0.1 Pa | 0.00040146308 inH₂O |
| 0.25 Pa | 0.0010036577 inH₂O |
| 0.5 Pa | 0.0020073154 inH₂O |
| 1 Pa | 0.0040146308 inH₂O |
| 2 Pa | 0.0080292615 inH₂O |
| 3 Pa | 0.012043892 inH₂O |
| 4 Pa | 0.016058523 inH₂O |
| 5 Pa | 0.020073154 inH₂O |
| 6 Pa | 0.024087785 inH₂O |
| 7 Pa | 0.028102415 inH₂O |
| 8 Pa | 0.032117046 inH₂O |
| 9 Pa | 0.036131677 inH₂O |
| 10 Pa | 0.040146308 inH₂O |
| Pascals (Pa) | Inches of water (inH₂O) |
|---|---|
| 12 Pa | 0.048175569 inH₂O |
| 15 Pa | 0.060219461 inH₂O |
| 20 Pa | 0.080292615 inH₂O |
| 25 Pa | 0.10036577 inH₂O |
| 30 Pa | 0.12043892 inH₂O |
| 40 Pa | 0.16058523 inH₂O |
| 50 Pa | 0.20073154 inH₂O |
| 75 Pa | 0.30109731 inH₂O |
| 100 Pa | 0.40146308 inH₂O |
| 250 Pa | 1.0036577 inH₂O |
| 500 Pa | 2.0073154 inH₂O |
| 1,000 Pa | 4.0146308 inH₂O |
About the units
Pascal (Pa)
One newton per square metre — a very small pressure. Atmospheric pressure is about 101,325 Pa.
Inch of water (inH₂O)
Conventional value 249.08891 Pa. HVAC duct static pressure and gas-appliance pressures use inches of water column.
Frequently asked questions
How many inches of water are in one pascal?
There are 0.00401463076 inches of water in one pascal, and this value is exact by definition.
How do I convert pascals to inches of water?
Multiply the number of pascals by 0.00401463076. For example, 10 Pa × 0.00401463076 = 0.0401463076 inH₂O.
How many pascals are in one inch of water?
One inch of water equals 249.08891 pascals. That is the reverse factor, 1 ÷ 0.00401463076.
What is 10 pascals in inches of water?
10 Pa = 0.0401463076 inH₂O.
Is this Pa to inH₂O converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.