Convert Inches of Water to Inches of Water (60 °F)
1 inch of water (inH₂O) equals 1.001000281 inches of water (60 °F) (inH₂O (60 °F)).
1 inH₂O = 1.001000281 inH₂O (60 °F)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk inch of water to inch of water (60 °F) converter to paste a column from Excel.
How to Convert Inch of Water to Inch of Water (60 °F)
- 1 inH₂O = 1.001000281 inH₂O (60 °F)
- 1 inH₂O (60 °F) = 0.9990007183 inH₂O
- Example: convert 15 inH₂O to inH₂O (60 °F): 15 inH₂O = 15 × 1.001000281 inH₂O (60 °F) = 15.01500422 inH₂O (60 °F)
Reference conditions. inH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C). inH₂O (60 °F): Water at 60 °F (15.6 °C), density ≈ 999.0 kg/m³, standard gravity. NIST value, 5 significant figures.
Formula
inH₂O (60 °F) = inH₂O × 1.001000281305
Derivation from SI units:
- 1 inH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.0254 m = 249.08891 Pa
- 1 inH₂O (60 °F) ≈ 999.0 kg/m³ × 9.80665 m/s² × 0.0254 m ≈ 248.84 Pa
- 1 inH₂O = 249.08891 Pa ÷ 248.84 Pa per inH₂O (60 °F) = 1.001000281305 inH₂O (60 °F)
One unit is a measured value, so the factor is approximate. Inch of Water definition: inch of water; Inch of Water (60 °F) definition: inch of water (60 °F).
Worked examples
- A conventional 1 inH₂O equals 1.001000281 inH₂O (60 °F).
1 inH₂O × 1.001000281 = 1.001000281 inH₂O (60 °F) - 10 inH₂O (conventional) is 10.01000281 inH₂O (60 °F).
10 inH₂O × 1.001000281 = 10.01000281 inH₂O (60 °F)
Inch of Water to Inch of Water (60 °F) conversion table
| Inches of Water (inH₂O) | Inches of Water (60 °F) (inH₂O (60 °F)) |
|---|---|
| 0.01 inH₂O | 0.01001000281 inH₂O (60 °F) |
| 0.02 inH₂O | 0.02002000563 inH₂O (60 °F) |
| 0.03 inH₂O | 0.03003000844 inH₂O (60 °F) |
| 0.05 inH₂O | 0.05005001407 inH₂O (60 °F) |
| 0.1 inH₂O | 0.1001000281 inH₂O (60 °F) |
| 0.15 inH₂O | 0.1501500422 inH₂O (60 °F) |
| 0.2 inH₂O | 0.2002000563 inH₂O (60 °F) |
| 0.25 inH₂O | 0.2502500703 inH₂O (60 °F) |
| 0.3 inH₂O | 0.3003000844 inH₂O (60 °F) |
| 0.4 inH₂O | 0.4004001125 inH₂O (60 °F) |
| 0.5 inH₂O | 0.5005001407 inH₂O (60 °F) |
| 0.75 inH₂O | 0.750750211 inH₂O (60 °F) |
| 1 inH₂O | 1.001000281 inH₂O (60 °F) |
| 1.5 inH₂O | 1.501500422 inH₂O (60 °F) |
| 2 inH₂O | 2.002000563 inH₂O (60 °F) |
| 2.5 inH₂O | 2.502500703 inH₂O (60 °F) |
| 3 inH₂O | 3.003000844 inH₂O (60 °F) |
| 4 inH₂O | 4.004001125 inH₂O (60 °F) |
| 5 inH₂O | 5.005001407 inH₂O (60 °F) |
| 7 inH₂O | 7.007001969 inH₂O (60 °F) |
| 10 inH₂O | 10.01000281 inH₂O (60 °F) |
| 11 inH₂O | 11.01100309 inH₂O (60 °F) |
| 14 inH₂O | 14.01400394 inH₂O (60 °F) |
| 20 inH₂O | 20.02000563 inH₂O (60 °F) |
| 27.7 inH₂O | 27.72770779 inH₂O (60 °F) |
Where it's used
Use this conversion when a flow-meter or gas-industry document specifies water at 60 °F. The difference is about 0.1 %, which matters for custody transfer and calibration but not for HVAC.
Inch of Water to other pressure units
| Conversion | 1 inH₂O equals |
|---|---|
| inch of water to pascal | 249.08891 Pa |
| inch of water to kilopascal | 0.24908891 kPa |
| inch of water to megapascal | 0.00024908891 MPa |
| inch of water to psi | 0.036127292 psi |
| inch of water to bar | 0.0024908891 bar |
| inch of water to millibar | 2.4908891 mbar |
| inch of water to decibar | 0.024908891 dbar |
| inch of water to torr | 1.86832047 Torr |
| inch of water to millimeter of mercury | 1.868320204 mmHg |
| inch of water to millimeter of water | 25.4 mmH₂O |
| inch of water to centimeter of water | 2.54 cmH₂O |
| inch of water to inch of water (60 °F) | 1.001000281 inH₂O (60 °F) |
| inch of water to inch of mercury | 0.07355591353 inHg |
| inch of water to atmosphere | 0.002458316408 atm |
| inch of water to barye | 2490.8891 Ba |
Frequently asked questions
Which inch of water should I use?
Use the conventional inch of water (249.08891 Pa) unless the document explicitly states 60 °F (248.84 Pa) or another temperature.
How many inches of water (60 °F) are in 1 inch of water?
1 inH₂O = 1.001000281 inH₂O (60 °F).
How do I convert inches of water to inches of water (60 °F)?
Multiply the value in inH₂O by 1.001000281. For example, 15 inH₂O × 1.001000281 = 15.01500422 inH₂O (60 °F).
Is the inH₂O to inH₂O (60 °F) 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, conventional (inH2O)".
- 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)".
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 to Inches of Water (60 °F). Retrieved October 17, 2026, from https://scientificconverters.com/pressure/inch-of-water-to-inch-of-water-60f/
IEEE
Scientific Converters, "Convert Inches of Water to Inches of Water (60 °F)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/inch-of-water-to-inch-of-water-60f/