Convert Inches of Water to ksi (inH2O to ksi)
1 inch of water (inH₂O) = 0.000036127292 ksi. 1 ksi = 27679.90471 inH₂O. Example: 15 inH₂O = 15 × 0.000036127292 = 0.00054190938 ksi.
Also searched as inches of water to ksi, inches of water in ksi, inches of water into ksi, inH2O to ksi, inH2O in ksi, inH2O into ksi, inch of water to ksi, inH2O to ksi converter and how many ksi in an inch of water.
1 inH₂O = 0.000036127292 ksi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk inch of water to ksi converter to paste a column from Excel.
How to Convert Inch of Water to ksi
- 1 inH₂O = 0.000036127292 ksi
- 1 ksi = 27679.90471 inH₂O
- Example: convert 15 inH₂O to ksi: 15 inH₂O = 15 × 0.000036127292 ksi = 0.00054190938 ksi
Reference conditions. inH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
ksi = inH₂O × 0.00003612729200008
or ksi = inH₂O ÷ 27679.9047102
Derivation from SI units:
- 1 inH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.0254 m = 249.08891 Pa
- 1 ksi = 1000 psi = 1 kip/in² = 6.894757293168 MPa
- 1 inH₂O = 249.08891 Pa ÷ 6894757.293168 Pa per ksi = 0.00003612729200008 ksi
Both units are defined exactly, so the factor is exact. Inch of Water definition: inch of water; ksi definition: ksi.
Worked examples
- A reading of 0.3 inH₂O converts to 0.0000108381876 ksi.
0.3 inH₂O × 0.000036127292 = 0.0000108381876 ksi - A value of 3 inH₂O is 0.000108381876 ksi.
3 inH₂O × 0.000036127292 = 0.000108381876 ksi
Inch of Water to ksi conversion table
| Inches of Water (inH₂O) | ksi |
|---|---|
| 0.01 inH₂O | 3.6127292 × 10⁻⁷ ksi |
| 0.02 inH₂O | 7.2254584 × 10⁻⁷ ksi |
| 0.03 inH₂O | 0.00000108381876 ksi |
| 0.05 inH₂O | 0.0000018063646 ksi |
| 0.1 inH₂O | 0.0000036127292 ksi |
| 0.15 inH₂O | 0.0000054190938 ksi |
| 0.2 inH₂O | 0.0000072254584 ksi |
| 0.25 inH₂O | 0.000009031823 ksi |
| 0.3 inH₂O | 0.0000108381876 ksi |
| 0.4 inH₂O | 0.0000144509168 ksi |
| 0.5 inH₂O | 0.000018063646 ksi |
| 0.75 inH₂O | 0.000027095469 ksi |
| 1 inH₂O | 0.000036127292 ksi |
| 1.5 inH₂O | 0.000054190938 ksi |
| 2 inH₂O | 0.000072254584 ksi |
| 2.5 inH₂O | 0.00009031823 ksi |
| 3 inH₂O | 0.000108381876 ksi |
| 4 inH₂O | 0.000144509168 ksi |
| 5 inH₂O | 0.00018063646 ksi |
| 7 inH₂O | 0.000252891044 ksi |
| 10 inH₂O | 0.00036127292 ksi |
| 11 inH₂O | 0.000397400212 ksi |
| 14 inH₂O | 0.000505782088 ksi |
| 20 inH₂O | 0.00072254584 ksi |
| 27.7 inH₂O | 0.001000725988 ksi |
Where it's used
Inches of Water are used for HVAC total external static pressure (residential ≈ 0.5 inH₂O), while ksi appear in yield and tensile strength in ASTM and ASME material specifications. Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Inch of Water to other pressure units
| Conversion | 1 inH₂O equals |
|---|---|
| inch of water to ksi | 0.000036127292 ksi |
| inch of water to pascal | 249.08891 Pa |
| inch of water to kilopascal | 0.24908891 kPa |
| inch of water to kilogram-force per square centimetre | 0.00254 kgf/cm² |
| inch of water to psi | 0.036127292 psi |
| inch of water to bar | 0.0024908891 bar |
| inch of water to millimeter of mercury | 1.868320204 mmHg |
| inch of water to atmosphere | 0.002458316408 atm |
Show 12 more units
| inch of water to megapascal | 0.00024908891 MPa |
|---|---|
| inch of water to gigapascal | 2.4908891 × 10⁻⁷ GPa |
| inch of water to newton per square millimetre | 0.00024908891 N/mm² |
| inch of water to kilogram-force per square millimetre | 0.0000254 kgf/mm² |
| inch of water to millibar | 2.4908891 mbar |
| inch of water to torr | 1.86832047 Torr |
| 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 mercury | 0.07355591353 inHg |
| inch of water to decibar | 0.024908891 dbar |
| inch of water to inch of water (60 °F) | 1.001000281 inH₂O (60 °F) |
| inch of water to barye | 2490.8891 Ba |
Frequently asked questions
How many ksi are in 1 inch of water?
1 inH₂O = 0.000036127292 ksi.
How do I convert inches of water to ksi?
Multiply the value in inH₂O by 0.000036127292, or divide it by 27679.90471. For example, 15 inH₂O × 0.000036127292 = 0.00054190938 ksi.
Is the inH₂O to ksi 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, "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, "kip per square inch (ksi)".
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 ksi (inH2O to ksi). Retrieved October 25, 2026, from https://scientificconverters.com/pressure/inch-of-water-to-ksi/
IEEE
Scientific Converters, "Convert Inches of Water to ksi (inH2O to ksi)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/inch-of-water-to-ksi/