Convert ksi to Inches of Water (ksi to inH2O)
1 ksi = 27679.90471 inches of water (inH₂O). 1 inH₂O = 0.000036127292 ksi. Example: 15 ksi = 15 × 27679.90471 = 415198.5707 inH₂O.
Also searched as ksi to inH2O, ksi in inH2O, ksi into inches of water, ksi in inches of water, ksi into inch of water, ksi to inch of water, ksi to inches of water converter and how many inches of water in a ksi.
1 ksi = 27679.90471 inH₂O
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ksi to inch of water converter to paste a column from Excel.
How to Convert ksi to Inch of Water
- 1 ksi = 27679.90471 inH₂O
- 1 inH₂O = 0.000036127292 ksi
- Example: convert 15 ksi to inH₂O: 15 ksi = 15 × 27679.90471 inH₂O = 415198.5707 inH₂O
Reference conditions. inH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
inH₂O = ksi × 27679.9047102
Derivation from SI units:
- 1 ksi = 1000 psi = 1 kip/in² = 6.894757293168 MPa
- 1 inH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.0254 m = 249.08891 Pa
- 1 ksi = 6894757.293168 Pa ÷ 249.08891 Pa per inH₂O = 27679.9047102 inH₂O
Both units are defined exactly, so the factor is exact. ksi definition: ksi; Inch of Water definition: inch of water.
Worked examples
- A reading of 20 ksi converts to 553598.0942 inH₂O.
20 ksi × 27679.90471 = 553598.0942 inH₂O - A value of 65 ksi is 1799193.806 inH₂O.
65 ksi × 27679.90471 = 1799193.806 inH₂O
ksi to Inch of Water conversion table
| ksi | Inches of Water (inH₂O) |
|---|---|
| 1 ksi | 27679.90471 inH₂O |
| 3 ksi | 83039.71413 inH₂O |
| 4 ksi | 110719.6188 inH₂O |
| 5 ksi | 138399.5236 inH₂O |
| 10 ksi | 276799.0471 inH₂O |
| 20 ksi | 553598.0942 inH₂O |
| 30 ksi | 830397.1413 inH₂O |
| 36 ksi | 996476.5696 inH₂O |
| 50 ksi | 1383995.236 inH₂O |
| 60 ksi | 1660794.283 inH₂O |
| 65 ksi | 1799193.806 inH₂O |
| 70 ksi | 1937593.33 inH₂O |
| 100 ksi | 2767990.471 inH₂O |
| 150 ksi | 4151985.707 inH₂O |
| 200 ksi | 5535980.942 inH₂O |
Where it's used
ksi are used for yield and tensile strength in ASTM and ASME material specifications, 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.
ksi to other pressure units
| Conversion | 1 ksi equals |
|---|---|
| ksi to inch of water | 27679.90471 inH₂O |
| ksi to pascal | 6894757.293 Pa |
| ksi to kilopascal | 6894.757293 kPa |
| ksi to kilogram-force per square centimetre | 70.30695796 kgf/cm² |
| ksi to psi | 1000 psi |
| ksi to bar | 68.94757293 bar |
| ksi to millimeter of mercury | 51714.9252 mmHg |
| ksi to atmosphere | 68.04596391 atm |
Show 12 more units
| ksi to megapascal | 6.894757293 MPa |
|---|---|
| ksi to gigapascal | 0.006894757293 GPa |
| ksi to newton per square millimetre | 6.894757293 N/mm² |
| ksi to kilogram-force per square millimetre | 0.7030695796 kgf/mm² |
| ksi to millibar | 68947.57293 mbar |
| ksi to torr | 51714.93257 Torr |
| ksi to millimeter of water | 703069.5796 mmH₂O |
| ksi to centimeter of water | 70306.95796 cmH₂O |
| ksi to inch of mercury | 2036.020677 inHg |
| ksi to decibar | 689.4757293 dbar |
| ksi to inch of water (60 °F) | 27707.5924 inH₂O (60 °F) |
| ksi to barye | 68947572.93 Ba |
Frequently asked questions
How many inches of water are in 1 ksi?
1 ksi = 27679.90471 inH₂O.
How do I convert ksi to inches of water?
Multiply the value in ksi by 27679.90471. For example, 15 ksi × 27679.90471 = 415198.5707 inH₂O.
Is the ksi 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, "kip per square inch (ksi)".
- 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 ksi to Inches of Water (ksi to inH2O). Retrieved October 25, 2026, from https://scientificconverters.com/pressure/ksi-to-inch-of-water/
IEEE
Scientific Converters, "Convert ksi to Inches of Water (ksi to inH2O)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/ksi-to-inch-of-water/