Convert ksi to Millimeters of Water (ksi to mmH2O)
1 ksi = 703069.5796 millimeters of water (mmH₂O). 1 mmH₂O = 0.000001422334331 ksi. Example: 15 ksi = 15 × 703069.5796 = 10546043.69 mmH₂O.
Also searched as ksi to mmH2O, ksi in mmH2O, ksi into millimeters of water, ksi in millimeters of water, ksi into millimeter of water, ksi to millimeter of water, ksi to millimeters of water converter, ksi to millimetres of water and how many millimeters of water in a ksi.
1 ksi = 703069.5796 mmH₂O
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ksi to millimeter of water converter to paste a column from Excel.
How to Convert ksi to Millimeter of Water
- 1 ksi = 703069.5796 mmH₂O
- 1 mmH₂O = 0.000001422334331 ksi
- Example: convert 15 ksi to mmH₂O: 15 ksi = 15 × 703069.5796 mmH₂O = 10546043.69 mmH₂O
Reference conditions. mmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
mmH₂O = ksi × 703069.5796392
Derivation from SI units:
- 1 ksi = 1000 psi = 1 kip/in² = 6.894757293168 MPa
- 1 mmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.001 m = 9.80665 Pa
- 1 ksi = 6894757.293168 Pa ÷ 9.80665 Pa per mmH₂O = 703069.5796392 mmH₂O
Both units are defined exactly, so the factor is exact. ksi definition: ksi; Millimeter of Water definition: millimeter of water.
Worked examples
- A reading of 20 ksi converts to 14061391.59 mmH₂O.
20 ksi × 703069.5796 = 14061391.59 mmH₂O - A value of 65 ksi is 45699522.68 mmH₂O.
65 ksi × 703069.5796 = 45699522.68 mmH₂O
ksi to Millimeter of Water conversion table
| ksi | Millimeters of Water (mmH₂O) |
|---|---|
| 1 ksi | 703069.5796 mmH₂O |
| 3 ksi | 2109208.739 mmH₂O |
| 4 ksi | 2812278.319 mmH₂O |
| 5 ksi | 3515347.898 mmH₂O |
| 10 ksi | 7030695.796 mmH₂O |
| 20 ksi | 14061391.59 mmH₂O |
| 30 ksi | 21092087.39 mmH₂O |
| 36 ksi | 25310504.87 mmH₂O |
| 50 ksi | 35153478.98 mmH₂O |
| 60 ksi | 42184174.78 mmH₂O |
| 65 ksi | 45699522.68 mmH₂O |
| 70 ksi | 49214870.57 mmH₂O |
| 100 ksi | 70306957.96 mmH₂O |
| 150 ksi | 105460436.9 mmH₂O |
| 200 ksi | 140613915.9 mmH₂O |
Where it's used
ksi are used for yield and tensile strength in ASTM and ASME material specifications, while millimeters of water appear in fan static pressure and duct design in Asia and Europe. 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 millimeter of water | 703069.5796 mmH₂O |
| 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 inch of water | 27679.90471 inH₂O |
Show 12 more units
| ksi to atmosphere | 68.04596391 atm |
|---|---|
| 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 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 millimeters of water are in 1 ksi?
1 ksi = 703069.5796 mmH₂O.
How do I convert ksi to millimeters of water?
Multiply the value in ksi by 703069.5796. For example, 15 ksi × 703069.5796 = 10546043.69 mmH₂O.
Is the ksi to mmH₂O 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, "millimeter of water, conventional (mmH2O)".
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 Millimeters of Water (ksi to mmH2O). Retrieved October 25, 2026, from https://scientificconverters.com/pressure/ksi-to-millimeter-of-water/
IEEE
Scientific Converters, "Convert ksi to Millimeters of Water (ksi to mmH2O)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/ksi-to-millimeter-of-water/