Inches of Water to Atmospheres
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inH2O
atm
Quick reference
| Inches of Water (inH2O) | Atmospheres (atm) |
|---|
Formula
Atmospheres = inches of water × 0.0024583173
Multiply the inches of water value by 0.002458317295830249 to get atmospheres. To reverse — divide atmospheres by 0.002458317295830249 to get inches of water.
About this conversion
Inches of water column (inH₂O) is used in HVAC and low-pressure measurement, equal to approximately 249 pascals. Learn more →
The atmosphere (atm) is a reference pressure unit equal to the average atmospheric pressure at sea level: 101,325 pascals. Learn more →
Source: NIST International Reference