How to convert inches of water to pascals
Pa = inH₂O × 249.08891Multiply the value in inches of water by 249.08891. To go the other way, multiply by 0.00401463076 (or divide by 249.08891).
An inch of water is larger than a pascal: one inch of water contains 249.08891 pascals.
Worked examples
- 1 inch of water1 inH₂O × 249.08891 = 249.08891 Pa
- 5 inches of water5 inH₂O × 249.08891 = 1,245.44455 Pa
- 10 inches of water10 inH₂O × 249.08891 = 2,490.8891 Pa
- 20 inches of water20 inH₂O × 249.08891 = 4,981.7782 Pa
- 100 inches of water100 inH₂O × 249.08891 = 24,908.891 Pa
Inches of water to pascals conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Inches of water (inH₂O) | Pascals (Pa) |
|---|---|
| 0.1 inH₂O | 24.908891 Pa |
| 0.25 inH₂O | 62.272227 Pa |
| 0.5 inH₂O | 124.54445 Pa |
| 1 inH₂O | 249.08891 Pa |
| 2 inH₂O | 498.17782 Pa |
| 3 inH₂O | 747.26673 Pa |
| 4 inH₂O | 996.35564 Pa |
| 5 inH₂O | 1,245.4445 Pa |
| 6 inH₂O | 1,494.5335 Pa |
| 7 inH₂O | 1,743.6224 Pa |
| 8 inH₂O | 1,992.7113 Pa |
| 9 inH₂O | 2,241.8002 Pa |
| 10 inH₂O | 2,490.8891 Pa |
| Inches of water (inH₂O) | Pascals (Pa) |
|---|---|
| 12 inH₂O | 2,989.0669 Pa |
| 15 inH₂O | 3,736.3336 Pa |
| 20 inH₂O | 4,981.7782 Pa |
| 25 inH₂O | 6,227.2227 Pa |
| 30 inH₂O | 7,472.6673 Pa |
| 40 inH₂O | 9,963.5564 Pa |
| 50 inH₂O | 12,454.445 Pa |
| 75 inH₂O | 18,681.668 Pa |
| 100 inH₂O | 24,908.891 Pa |
| 250 inH₂O | 62,272.227 Pa |
| 500 inH₂O | 124,544.45 Pa |
| 1,000 inH₂O | 249,088.91 Pa |
About the units
Inch of water (inH₂O)
Conventional value 249.08891 Pa. HVAC duct static pressure and gas-appliance pressures use inches of water column.
Pascal (Pa)
One newton per square metre — a very small pressure. Atmospheric pressure is about 101,325 Pa.
Frequently asked questions
How many pascals are in one inch of water?
There are 249.08891 pascals in one inch of water, and this value is exact by definition.
How do I convert inches of water to pascals?
Multiply the number of inches of water by 249.08891. For example, 10 inH₂O × 249.08891 = 2,490.8891 Pa.
How many inches of water are in one pascal?
One pascal equals 0.00401463076 inches of water. That is the reverse factor, 1 ÷ 249.08891.
What is 10 inches of water in pascals?
10 inH₂O = 2,490.8891 Pa.
Is this inH₂O to Pa 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.