Pascals to inches of water
Type a value in pascals to see it in inches of water straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the pascals box.
- Read the result in inches of water as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
inH₂O = Pa × 0.00401463076
Multiply the value in pascals by 0.00401463076 to get inches of water.
Example
To convert 25 Pa to inches of water: 25 × 0.00401463076 = 0.100366 inH₂O.
Conversion table
| Pascals (Pa) | Inches of water (inH₂O) |
|---|---|
| 1 | 0.00401463 |
| 2 | 0.00802926 |
| 3 | 0.0120439 |
| 5 | 0.0200732 |
| 10 | 0.0401463 |
| 20 | 0.0802926 |
| 25 | 0.100366 |
| 50 | 0.200732 |
| 100 | 0.401463 |
| 250 | 1.00366 |
| 500 | 2.00732 |
| 1,000 | 4.01463 |
About the units
- Pascal
- The SI unit of pressure, equal to a force of one newton acting on one square meter.
- Inch of water
- The pressure of a one inch water column at the conventional density 1000 kg/m³ and standard gravity: 249.08891 Pa. Used for HVAC ducts and air flow.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many inches of water are in one pascal?
1 Pa = 0.00401463 inH₂O exactly.
How do I convert pascals to inches of water?
Use inH₂O = Pa × 0.00401463076. For example, 25 Pa = 0.100366 inH₂O.
How many pascals are in one inch of water?
1 inH₂O = 249.089 Pa.
What is the difference between gauge and absolute pressure?
Gauge pressure is measured from the surrounding air pressure, while absolute pressure starts from a perfect vacuum. These converters change the unit only, so a gauge reading stays a gauge reading.
Are torr and mmHg the same?
Almost. One torr is 101325/760 Pa, about 133.322368 Pa, and one conventional mmHg is 133.322387 Pa, a difference of less than one part per million. For everyday use you can treat them as equal.