Convert Millimeters of Water to N/mm²
1 millimeter of water (mmH₂O) = 0.00000980665 newtons per square millimetre (N/mm²). 1 N/mm² = 101971.6213 mmH₂O. Example: 15 mmH₂O = 15 × 0.00000980665 = 0.00014709975 N/mm².
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1 mmH₂O = 0.00000980665 N/mm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimeter of water to newton per square millimetre converter to paste a column from Excel.
How to Convert Millimeter of Water to Newton per Square Millimetre
- 1 mmH₂O = 0.00000980665 N/mm²
- 1 N/mm² = 101971.6213 mmH₂O
- Example: convert 15 mmH₂O to N/mm²: 15 mmH₂O = 15 × 0.00000980665 N/mm² = 0.00014709975 N/mm²
Reference conditions. mmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
N/mm² = mmH₂O × 0.00000980665
or N/mm² = mmH₂O ÷ 101971.6212978
Derivation from SI units:
- 1 mmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.001 m = 9.80665 Pa
- 1 N/mm² = 1 N ÷ 10⁻⁶ m² = 10⁶ Pa = 1 MPa
- 1 mmH₂O = 9.80665 Pa ÷ 1000000 Pa per N/mm² = 0.00000980665 N/mm²
Both units are defined exactly, so the factor is exact. Millimeter of Water definition: millimeter of water; Newton per Square Millimetre definition: newton per square millimetre.
Worked examples
- A reading of 25 mmH₂O converts to 0.00024516625 N/mm².
25 mmH₂O × 0.00000980665 = 0.00024516625 N/mm² - A value of 250 mmH₂O is 0.0024516625 N/mm².
250 mmH₂O × 0.00000980665 = 0.0024516625 N/mm²
Millimeter of Water to Newton per Square Millimetre conversion table
| Millimeters of Water (mmH₂O) | Newtons per Square Millimetre (N/mm²) |
|---|---|
| 1 mmH₂O | 0.00000980665 N/mm² |
| 2 mmH₂O | 0.0000196133 N/mm² |
| 5 mmH₂O | 0.00004903325 N/mm² |
| 10 mmH₂O | 0.0000980665 N/mm² |
| 15 mmH₂O | 0.00014709975 N/mm² |
| 20 mmH₂O | 0.000196133 N/mm² |
| 25 mmH₂O | 0.00024516625 N/mm² |
| 30 mmH₂O | 0.0002941995 N/mm² |
| 50 mmH₂O | 0.0004903325 N/mm² |
| 75 mmH₂O | 0.00073549875 N/mm² |
| 100 mmH₂O | 0.000980665 N/mm² |
| 150 mmH₂O | 0.0014709975 N/mm² |
| 200 mmH₂O | 0.00196133 N/mm² |
| 250 mmH₂O | 0.0024516625 N/mm² |
| 300 mmH₂O | 0.002941995 N/mm² |
| 500 mmH₂O | 0.004903325 N/mm² |
| 1000 mmH₂O | 0.00980665 N/mm² |
| 2000 mmH₂O | 0.0196133 N/mm² |
| 5000 mmH₂O | 0.04903325 N/mm² |
| 10000 mmH₂O | 0.0980665 N/mm² |
Where it's used
Millimeters of Water are used for fan static pressure and duct design in Asia and Europe, while newtons per square millimetre appear in steel yield and tensile strength (S355: 355 N/mm²). 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 newton per square millimetre | 0.00000980665 N/mm² |
| millimeter of water to pascal | 9.80665 Pa |
| millimeter of water to kilopascal | 0.00980665 kPa |
| millimeter of water to ksi | 0.000001422334331 ksi |
| 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 |
Show 12 more units
| millimeter of water to inch of water | 0.03937007874 inH₂O |
|---|---|
| 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 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 newtons per square millimetre are in 1 millimeter of water?
1 mmH₂O = 0.00000980665 N/mm².
How do I convert millimeters of water to newtons per square millimetre?
Multiply the value in mmH₂O by 0.00000980665, or divide it by 101971.6213. For example, 15 mmH₂O × 0.00000980665 = 0.00014709975 N/mm².
Is the mmH₂O to N/mm² conversion exact?
Yes. Both units are defined exactly, and 1 mmH₂O is exactly 0.00000980665 N/mm².
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)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
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 N/mm². Retrieved October 25, 2026, from https://scientificconverters.com/pressure/millimeter-of-water-to-newton-per-square-millimeter/
IEEE
Scientific Converters, "Convert Millimeters of Water to N/mm²," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/millimeter-of-water-to-newton-per-square-millimeter/