Inches of Water to Pascals (inH₂O → Pa)
Formula
1 inH₂O = 249.082 PaConversion Table
| inH₂O | Pa |
|---|---|
| 0 | 0 |
| 1.0000 | 249.08 |
| 2.0000 | 498.16 |
| 3.0000 | 747.25 |
| 4.0000 | 996.33 |
| 5.0000 | 1,245.4 |
| 6.0000 | 1,494.5 |
| 7.0000 | 1,743.6 |
| 8.0000 | 1,992.7 |
| 9.0000 | 2,241.7 |
| 10.000 | 2,490.8 |
| 11.000 | 2,739.9 |
| 12.000 | 2,989.0 |
| 13.000 | 3,238.1 |
| 14.000 | 3,487.1 |
| 15.000 | 3,736.2 |
| 16.000 | 3,985.3 |
| 17.000 | 4,234.4 |
| 18.000 | 4,483.5 |
| 19.000 | 4,732.6 |
| inH₂O | Pa |
|---|---|
| 20.000 | 4,981.6 |
| 21.000 | 5,230.7 |
| 22.000 | 5,479.8 |
| 23.000 | 5,728.9 |
| 24.000 | 5,978.0 |
| 25.000 | 6,227.1 |
| 26.000 | 6,476.1 |
| 27.000 | 6,725.2 |
| 28.000 | 6,974.3 |
| 29.000 | 7,223.4 |
| 30.000 | 7,472.5 |
| 31.000 | 7,721.5 |
| 32.000 | 7,970.6 |
| 33.000 | 8,219.7 |
| 34.000 | 8,468.8 |
| 35.000 | 8,717.9 |
| 36.000 | 8,967.0 |
| 37.000 | 9,216.0 |
| 38.000 | 9,465.1 |
| 39.000 | 9,714.2 |
| inH₂O | Pa |
|---|---|
| 40.000 | 9,963.3 |
| 41.000 | 10,212 |
| 42.000 | 10,461 |
| 43.000 | 10,711 |
| 44.000 | 10,960 |
| 45.000 | 11,209 |
| 46.000 | 11,458 |
| 47.000 | 11,707 |
| 48.000 | 11,956 |
| 49.000 | 12,205 |
| 50.000 | 12,454 |
| 51.000 | 12,703 |
| 52.000 | 12,952 |
| 53.000 | 13,201 |
| 54.000 | 13,450 |
| 55.000 | 13,700 |
| 56.000 | 13,949 |
| 57.000 | 14,198 |
| 58.000 | 14,447 |
| 59.000 | 14,696 |
| inH₂O | Pa |
|---|---|
| 60.000 | 14,945 |
| 61.000 | 15,194 |
| 62.000 | 15,443 |
| 63.000 | 15,692 |
| 64.000 | 15,941 |
| 65.000 | 16,190 |
| 66.000 | 16,439 |
| 67.000 | 16,688 |
| 68.000 | 16,938 |
| 69.000 | 17,187 |
| 70.000 | 17,436 |
| 71.000 | 17,685 |
| 72.000 | 17,934 |
| 73.000 | 18,183 |
| 74.000 | 18,432 |
| 75.000 | 18,681 |
| 76.000 | 18,930 |
| 77.000 | 19,179 |
| 78.000 | 19,428 |
| 79.000 | 19,677 |
Inches of Water to Pascals Conversion
Converting Inches of Water (inH₂O) to Pascals (Pa) is a common pressure conversion. 1 inH₂O equals 249.082 Pa. For example, 100 inH₂O is equal to 24,908.2 Pa.
Quick Mental Math: Inches of Water to Pascals
Multiply inches-of-water by approximately 249.09 to convert to pascals.
Why is converting Inches of Water to Pascals tricky?
The non-integer multiplier 249.09 is imprecise for mental estimation.
Quick Reference Values
1 inH₂O = 249.082 Pa. 5 inH₂O = 1,245.41 Pa. 10 inH₂O = 2,490.82 Pa. 25 inH₂O = 6,227.05 Pa. 50 inH₂O = 12,454.1 Pa. 100 inH₂O = 24,908.2 Pa.
What is Inches of Water?
Inches of Water (inH₂O) is a unit of pressure. Inches of water measure pressure as the height in inches of a water column. One inch of water equals 249.0889 pascals (Pa) at 4 °C. This unit is widely used to measure low-pressure differentials in HVAC and fluid systems [nist-si-guide]. The use of water columns for pressure measurement dates to early fluid mechanics studies. The inch unit was adopted in English-speaking countries for practical low-pressure measurement. It remains standardized for building and industrial applications [nist-si-guide]. Inches of water are used primarily in the United States for HVAC duct pressures, gas pressure measurements, and cleanroom environments. Other countries often use pascals or millimeters of water but recognize inH2O in specific sectors [nist-si-guide].
What is Pascals?
Pascals (Pa) is a unit of pressure. The pascal (Pa) is the SI derived unit of pressure, defined as one newton per square meter (1 Pa = 1 N/m²). It quantifies force applied evenly over an area and is expressed as kg·m⁻¹·s⁻² in base SI units [bipm-si-brochure]. Named after Blaise Pascal, the pascal was adopted by BIPM in 1971 to replace older pressure units and standardize measurement in the SI system. It reflects the link between force and area in pressure measurements [bipm-si-brochure]. Pascals are the standard pressure unit in scientific research, meteorology, and engineering globally. Countries following SI, including members of ISO and NIST guidelines, use pascals for atmospheric and mechanical pressure [nist-si-guide].
Common Misspellings
People often search for this conversion using these alternate spellings: inch of water, inch-water, in h2o, inch h20, pascal, pascals, pascel, pascall, pasceles. All of these refer to the Inches of Water to Pascals conversion.