Convert Inches of Water (60 °F) to Atmospheres
1 inch of water (60 °F) (inH₂O (60 °F)) equals 0.002455859857 atmospheres (atm).
1 inH₂O (60 °F) = 0.002455859857 atm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk inch of water (60 °F) to atmosphere converter to paste a column from Excel.
How to Convert Inch of Water (60 °F) to Atmosphere
- 1 inH₂O (60 °F) = 0.002455859857 atm
- 1 atm = 407.1893586 inH₂O (60 °F)
- Example: convert 15 inH₂O (60 °F) to atm: 15 inH₂O (60 °F) = 15 × 0.002455859857 atm = 0.03683789785 atm
Reference conditions. inH₂O (60 °F): Water at 60 °F (15.6 °C), density ≈ 999.0 kg/m³, standard gravity. NIST value, 5 significant figures.
Formula
atm = inH₂O (60 °F) × 0.002455859856896
or atm = inH₂O (60 °F) ÷ 407.189358624
Derivation from SI units:
- 1 inH₂O (60 °F) ≈ 999.0 kg/m³ × 9.80665 m/s² × 0.0254 m ≈ 248.84 Pa
- 1 atm = 101 325 Pa (exact, by definition)
- 1 inH₂O (60 °F) = 248.84 Pa ÷ 101325 Pa per atm = 0.002455859856896 atm
One unit is a measured value, so the factor is approximate. Inch of Water (60 °F) definition: inch of water (60 °F); Atmosphere definition: atmosphere.
Worked examples
- A reading of 0.5 inH₂O (60 °F) converts to 0.001227929928 atm.
0.5 inH₂O (60 °F) × 0.002455859857 = 0.001227929928 atm - A value of 7 inH₂O (60 °F) is 0.017191019 atm.
7 inH₂O (60 °F) × 0.002455859857 = 0.017191019 atm
Inch of Water (60 °F) to Atmosphere conversion table
| Inches of Water (60 °F) (inH₂O (60 °F)) | Atmospheres (atm) |
|---|---|
| 0.01 inH₂O (60 °F) | 0.00002455859857 atm |
| 0.05 inH₂O (60 °F) | 0.0001227929928 atm |
| 0.1 inH₂O (60 °F) | 0.0002455859857 atm |
| 0.25 inH₂O (60 °F) | 0.0006139649642 atm |
| 0.5 inH₂O (60 °F) | 0.001227929928 atm |
| 1 inH₂O (60 °F) | 0.002455859857 atm |
| 2 inH₂O (60 °F) | 0.004911719714 atm |
| 3 inH₂O (60 °F) | 0.007367579571 atm |
| 5 inH₂O (60 °F) | 0.01227929928 atm |
| 7 inH₂O (60 °F) | 0.017191019 atm |
| 10 inH₂O (60 °F) | 0.02455859857 atm |
| 14 inH₂O (60 °F) | 0.034382038 atm |
| 20 inH₂O (60 °F) | 0.04911719714 atm |
| 27.7 inH₂O (60 °F) | 0.06802731804 atm |
Where it's used
Inches of Water (60 °F) are used for older US gas-industry and flow-meter references, while atmospheres appear in chemistry and gas laws (STP and NTP conditions). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Inch of Water (60 °F) to other pressure units
| Conversion | 1 inH₂O (60 °F) equals |
|---|---|
| inch of water (60 °F) to pascal | 248.84 Pa |
| inch of water (60 °F) to kilopascal | 0.24884 kPa |
| inch of water (60 °F) to megapascal | 0.00024884 MPa |
| inch of water (60 °F) to psi | 0.03609119066 psi |
| inch of water (60 °F) to bar | 0.0024884 bar |
| inch of water (60 °F) to millibar | 2.4884 mbar |
| inch of water (60 °F) to decibar | 0.024884 dbar |
| inch of water (60 °F) to torr | 1.866453491 Torr |
| inch of water (60 °F) to millimeter of mercury | 1.866453225 mmHg |
| inch of water (60 °F) to millimeter of water | 25.37461824 mmH₂O |
| inch of water (60 °F) to centimeter of water | 2.537461824 cmH₂O |
| inch of water (60 °F) to inch of water | 0.9990007183 inH₂O |
| inch of water (60 °F) to inch of mercury | 0.07348241045 inHg |
| inch of water (60 °F) to atmosphere | 0.002455859857 atm |
| inch of water (60 °F) to barye | 2488.4 Ba |
Frequently asked questions
How many atmospheres are in 1 inch of water (60 °F)?
1 inH₂O (60 °F) = 0.002455859857 atm.
How do I convert inches of water (60 °F) to atmospheres?
Multiply the value in inH₂O (60 °F) by 0.002455859857, or divide it by 407.1893586. For example, 15 inH₂O (60 °F) × 0.002455859857 = 0.03683789785 atm.
Is the inH₂O (60 °F) to atm conversion exact?
Not exactly. The inch of water (60 °F) is a measured value (Water at 60 °F (15.6 °C), density ≈ 999.0 kg/m³, standard gravity. NIST value, 5 significant figures.). Results are good to about 5 significant figures.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "inch of water (60 °F)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "atmosphere, standard (atm)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Inches of Water (60 °F) to Atmospheres. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/inch-of-water-60f-to-atmosphere/
IEEE
Scientific Converters, "Convert Inches of Water (60 °F) to Atmospheres," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/inch-of-water-60f-to-atmosphere/