Convert Decibars to Inches of Water
1 decibar (dbar) equals 40.1463076 inches of water (inH₂O).
1 dbar = 40.1463076 inH₂O
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk decibar to inch of water converter to paste a column from Excel.
How to Convert Decibar to Inch of Water
- 1 dbar = 40.1463076 inH₂O
- 1 inH₂O = 0.024908891 dbar
- Example: convert 15 dbar to inH₂O: 15 dbar = 15 × 40.1463076 inH₂O = 602.194614 inH₂O
Reference conditions. inH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
inH₂O = dbar × 40.14630759756
Derivation from SI units:
- 1 dbar = 10⁻¹ bar = 10⁴ Pa
- 1 inH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.0254 m = 249.08891 Pa
- 1 dbar = 10000 Pa ÷ 249.08891 Pa per inH₂O = 40.14630759756 inH₂O
Both units are defined exactly, so the factor is exact. Decibar definition: decibar; Inch of Water definition: inch of water.
Worked examples
- A reading of 50 dbar converts to 2007.31538 inH₂O.
50 dbar × 40.1463076 = 2007.31538 inH₂O - A value of 1000 dbar is 40146.3076 inH₂O.
1000 dbar × 40.1463076 = 40146.3076 inH₂O
Decibar to Inch of Water conversion table
| Decibars (dbar) | Inches of Water (inH₂O) |
|---|---|
| 1 dbar | 40.1463076 inH₂O |
| 5 dbar | 200.731538 inH₂O |
| 10 dbar | 401.463076 inH₂O |
| 20 dbar | 802.926152 inH₂O |
| 50 dbar | 2007.31538 inH₂O |
| 100 dbar | 4014.63076 inH₂O |
| 200 dbar | 8029.26152 inH₂O |
| 500 dbar | 20073.1538 inH₂O |
| 1000 dbar | 40146.3076 inH₂O |
| 2000 dbar | 80292.6152 inH₂O |
| 4000 dbar | 160585.2304 inH₂O |
| 6000 dbar | 240877.8456 inH₂O |
| 11000 dbar | 441609.3836 inH₂O |
Where it's used
Decibars are used for oceanography: CTD instruments report sea pressure in dbar, while inches of water appear in HVAC total external static pressure (residential ≈ 0.5 inH₂O). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Decibar to other pressure units
| Conversion | 1 dbar equals |
|---|---|
| decibar to pascal | 10000 Pa |
| decibar to kilopascal | 10 kPa |
| decibar to megapascal | 0.01 MPa |
| decibar to psi | 1.450377377 psi |
| decibar to bar | 0.1 bar |
| decibar to millibar | 100 mbar |
| decibar to torr | 75.00616827 Torr |
| decibar to millimeter of mercury | 75.00615758 mmHg |
| decibar to millimeter of water | 1019.716213 mmH₂O |
| decibar to centimeter of water | 101.9716213 cmH₂O |
| decibar to inch of water | 40.1463076 inH₂O |
| decibar to inch of water (60 °F) | 40.1864652 inH₂O (60 °F) |
| decibar to inch of mercury | 2.95299833 inHg |
| decibar to atmosphere | 0.09869232667 atm |
| decibar to barye | 100000 Ba |
Frequently asked questions
How many inches of water are in 1 decibar?
1 dbar = 40.1463076 inH₂O.
How do I convert decibars to inches of water?
Multiply the value in dbar by 40.1463076. For example, 15 dbar × 40.1463076 = 602.194614 inH₂O.
Is the dbar to inH₂O conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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, "bar", with SI prefix deci (10⁻¹).
- 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)".
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 Decibars to Inches of Water. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/decibar-to-inch-of-water/
IEEE
Scientific Converters, "Convert Decibars to Inches of Water," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/decibar-to-inch-of-water/