Convert Gigapascals to Millimeters of Water (GPa to mmH2O)
1 gigapascal (GPa) = 101971621.3 millimeters of water (mmH₂O). 1 mmH₂O = 9.80665 × 10⁻⁹ GPa. Example: 15 GPa = 15 × 101971621.3 = 1529574319 mmH₂O.
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1 GPa = 101971621.3 mmH₂O
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk gigapascal to millimeter of water converter to paste a column from Excel.
How to Convert Gigapascal to Millimeter of Water
- 1 GPa = 101971621.3 mmH₂O
- 1 mmH₂O = 9.80665 × 10⁻⁹ GPa
- Example: convert 15 GPa to mmH₂O: 15 GPa = 15 × 101971621.3 mmH₂O = 1529574319 mmH₂O
Reference conditions. mmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
mmH₂O = GPa × 101971621.2978
Derivation from SI units:
- 1 GPa = 10⁹ Pa = 1000 MPa = 1 kN/mm²
- 1 mmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.001 m = 9.80665 Pa
- 1 GPa = 1000000000 Pa ÷ 9.80665 Pa per mmH₂O = 101971621.2978 mmH₂O
Both units are defined exactly, so the factor is exact. Gigapascal definition: gigapascal; Millimeter of Water definition: millimeter of water.
Worked examples
- A reading of 10 GPa converts to 1019716213 mmH₂O.
10 GPa × 101971621.3 = 1019716213 mmH₂O - A value of 190 GPa is 19374608050 mmH₂O.
190 GPa × 101971621.3 = 19374608050 mmH₂O
Gigapascal to Millimeter of Water conversion table
| Gigapascals (GPa) | Millimeters of Water (mmH₂O) |
|---|---|
| 0.5 GPa | 50985810.65 mmH₂O |
| 1 GPa | 101971621.3 mmH₂O |
| 2 GPa | 203943242.6 mmH₂O |
| 3 GPa | 305914863.9 mmH₂O |
| 5 GPa | 509858106.5 mmH₂O |
| 10 GPa | 1019716213 mmH₂O |
| 45 GPa | 4588722958 mmH₂O |
| 70 GPa | 7138013491 mmH₂O |
| 110 GPa | 11216878340 mmH₂O |
| 117 GPa | 11930679690 mmH₂O |
| 190 GPa | 19374608050 mmH₂O |
| 200 GPa | 20394324260 mmH₂O |
| 210 GPa | 21414040470 mmH₂O |
| 400 GPa | 40788648520 mmH₂O |
| 1000 GPa | 101971621300 mmH₂O |
Where it's used
Gigapascals are used for young's modulus and shear modulus of metals, ceramics and composites, 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.
Gigapascal to other pressure units
| Conversion | 1 GPa equals |
|---|---|
| gigapascal to millimeter of water | 101971621.3 mmH₂O |
| gigapascal to pascal | 1000000000 Pa |
| gigapascal to kilopascal | 1000000 kPa |
| gigapascal to ksi | 145.0377377 ksi |
| gigapascal to kilogram-force per square centimetre | 10197.16213 kgf/cm² |
| gigapascal to psi | 145037.7377 psi |
| gigapascal to bar | 10000 bar |
| gigapascal to millimeter of mercury | 7500615.758 mmHg |
Show 12 more units
| gigapascal to inch of water | 4014630.76 inH₂O |
|---|---|
| gigapascal to atmosphere | 9869.232667 atm |
| gigapascal to megapascal | 1000 MPa |
| gigapascal to newton per square millimetre | 1000 N/mm² |
| gigapascal to kilogram-force per square millimetre | 101.9716213 kgf/mm² |
| gigapascal to millibar | 10000000 mbar |
| gigapascal to torr | 7500616.827 Torr |
| gigapascal to centimeter of water | 10197162.13 cmH₂O |
| gigapascal to inch of mercury | 295299.833 inHg |
| gigapascal to decibar | 100000 dbar |
| gigapascal to inch of water (60 °F) | 4018646.52 inH₂O (60 °F) |
| gigapascal to barye | 10000000000 Ba |
Frequently asked questions
How many millimeters of water are in 1 gigapascal?
1 GPa = 101971621.3 mmH₂O.
How do I convert gigapascals to millimeters of water?
Multiply the value in GPa by 101971621.3. For example, 15 GPa × 101971621.3 = 1529574319 mmH₂O.
Is the GPa 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
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- 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 Gigapascals to Millimeters of Water (GPa to mmH2O). Retrieved October 25, 2026, from https://scientificconverters.com/pressure/gigapascal-to-millimeter-of-water/
IEEE
Scientific Converters, "Convert Gigapascals to Millimeters of Water (GPa to mmH2O)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/gigapascal-to-millimeter-of-water/