Convert Millimeters of Water to ksi (mmH2O to ksi)
1 millimeter of water (mmH₂O) = 0.000001422334331 ksi. 1 ksi = 703069.5796 mmH₂O. Example: 15 mmH₂O = 15 × 0.000001422334331 = 0.00002133501496 ksi.
Also searched as millimeters of water to ksi, millimeters of water in ksi, millimeters of water into ksi, mmH2O to ksi, mmH2O in ksi, mmH2O into ksi, millimeter of water to ksi, mmH2O to ksi converter, millimetres of water to ksi and how many ksi in a millimeter of water.
1 mmH₂O = 0.000001422334331 ksi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimeter of water to ksi converter to paste a column from Excel.
How to Convert Millimeter of Water to ksi
- 1 mmH₂O = 0.000001422334331 ksi
- 1 ksi = 703069.5796 mmH₂O
- Example: convert 15 mmH₂O to ksi: 15 mmH₂O = 15 × 0.000001422334331 ksi = 0.00002133501496 ksi
Reference conditions. mmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
ksi = mmH₂O × 0.000001422334330712
or ksi = mmH₂O ÷ 703069.5796392
Derivation from SI units:
- 1 mmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.001 m = 9.80665 Pa
- 1 ksi = 1000 psi = 1 kip/in² = 6.894757293168 MPa
- 1 mmH₂O = 9.80665 Pa ÷ 6894757.293168 Pa per ksi = 0.000001422334330712 ksi
Both units are defined exactly, so the factor is exact. Millimeter of Water definition: millimeter of water; ksi definition: ksi.
Worked examples
- A reading of 25 mmH₂O converts to 0.00003555835827 ksi.
25 mmH₂O × 0.000001422334331 = 0.00003555835827 ksi - A value of 250 mmH₂O is 0.0003555835827 ksi.
250 mmH₂O × 0.000001422334331 = 0.0003555835827 ksi
Millimeter of Water to ksi conversion table
| Millimeters of Water (mmH₂O) | ksi |
|---|---|
| 1 mmH₂O | 0.000001422334331 ksi |
| 2 mmH₂O | 0.000002844668661 ksi |
| 5 mmH₂O | 0.000007111671654 ksi |
| 10 mmH₂O | 0.00001422334331 ksi |
| 15 mmH₂O | 0.00002133501496 ksi |
| 20 mmH₂O | 0.00002844668661 ksi |
| 25 mmH₂O | 0.00003555835827 ksi |
| 30 mmH₂O | 0.00004267002992 ksi |
| 50 mmH₂O | 0.00007111671654 ksi |
| 75 mmH₂O | 0.0001066750748 ksi |
| 100 mmH₂O | 0.0001422334331 ksi |
| 150 mmH₂O | 0.0002133501496 ksi |
| 200 mmH₂O | 0.0002844668661 ksi |
| 250 mmH₂O | 0.0003555835827 ksi |
| 300 mmH₂O | 0.0004267002992 ksi |
| 500 mmH₂O | 0.0007111671654 ksi |
| 1000 mmH₂O | 0.001422334331 ksi |
| 2000 mmH₂O | 0.002844668661 ksi |
| 5000 mmH₂O | 0.007111671654 ksi |
| 10000 mmH₂O | 0.01422334331 ksi |
Where it's used
Millimeters of Water are used for fan static pressure and duct design in Asia and Europe, 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.
Millimeter of Water to other pressure units
| Conversion | 1 mmH₂O equals |
|---|---|
| millimeter of water to ksi | 0.000001422334331 ksi |
| millimeter of water to pascal | 9.80665 Pa |
| millimeter of water to kilopascal | 0.00980665 kPa |
| millimeter of water to kilogram-force per square centimetre | 0.0001 kgf/cm² |
| millimeter of water to psi | 0.001422334331 psi |
| millimeter of water to bar | 0.0000980665 bar |
| millimeter of water to millimeter of mercury | 0.07355591353 mmHg |
| millimeter of water to inch of water | 0.03937007874 inH₂O |
Show 12 more units
| millimeter of water to atmosphere | 0.00009678411054 atm |
|---|---|
| millimeter of water to megapascal | 0.00000980665 MPa |
| millimeter of water to gigapascal | 9.80665 × 10⁻⁹ GPa |
| millimeter of water to newton per square millimetre | 0.00000980665 N/mm² |
| millimeter of water to kilogram-force per square millimetre | 0.000001 kgf/mm² |
| millimeter of water to millibar | 0.0980665 mbar |
| millimeter of water to torr | 0.07355592401 Torr |
| millimeter of water to centimeter of water | 0.1 cmH₂O |
| millimeter of water to inch of mercury | 0.002895902107 inHg |
| millimeter of water to decibar | 0.000980665 dbar |
| millimeter of water to inch of water (60 °F) | 0.03940945989 inH₂O (60 °F) |
| millimeter of water to barye | 98.0665 Ba |
Frequently asked questions
How many ksi are in 1 millimeter of water?
1 mmH₂O = 0.000001422334331 ksi.
How do I convert millimeters of water to ksi?
Multiply the value in mmH₂O by 0.000001422334331, or divide it by 703069.5796. For example, 15 mmH₂O × 0.000001422334331 = 0.00002133501496 ksi.
Is the mmH₂O 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, "millimeter of water, conventional (mmH2O)".
- 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 Millimeters of Water to ksi (mmH2O to ksi). Retrieved October 25, 2026, from https://scientificconverters.com/pressure/millimeter-of-water-to-ksi/
IEEE
Scientific Converters, "Convert Millimeters of Water to ksi (mmH2O to ksi)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/millimeter-of-water-to-ksi/