Convert Megapascals to Millimeters of Water
1 megapascal (MPa) equals 101971.6213 millimeters of water (mmH₂O).
1 MPa = 101971.6213 mmH₂O
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk megapascal to millimeter of water converter to paste a column from Excel.
How to Convert Megapascal to Millimeter of Water
- 1 MPa = 101971.6213 mmH₂O
- 1 mmH₂O = 0.00000980665 MPa
- Example: convert 15 MPa to mmH₂O: 15 MPa = 15 × 101971.6213 mmH₂O = 1529574.319 mmH₂O
Reference conditions. mmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
mmH₂O = MPa × 101971.6212978
Derivation from SI units:
- 1 MPa = 10⁶ Pa = 1 N/mm²
- 1 mmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.001 m = 9.80665 Pa
- 1 MPa = 1000000 Pa ÷ 9.80665 Pa per mmH₂O = 101971.6212978 mmH₂O
Both units are defined exactly, so the factor is exact. Megapascal definition: megapascal; Millimeter of Water definition: millimeter of water.
Worked examples
- A reading of 2 MPa converts to 203943.2426 mmH₂O.
2 MPa × 101971.6213 = 203943.2426 mmH₂O - A value of 30 MPa is 3059148.639 mmH₂O.
30 MPa × 101971.6213 = 3059148.639 mmH₂O
Megapascal to Millimeter of Water conversion table
| Megapascals (MPa) | Millimeters of Water (mmH₂O) |
|---|---|
| 0.01 MPa | 1019.716213 mmH₂O |
| 0.05 MPa | 5098.581065 mmH₂O |
| 0.1 MPa | 10197.16213 mmH₂O |
| 0.2 MPa | 20394.32426 mmH₂O |
| 0.5 MPa | 50985.81065 mmH₂O |
| 0.7 MPa | 71380.13491 mmH₂O |
| 1 MPa | 101971.6213 mmH₂O |
| 1.5 MPa | 152957.4319 mmH₂O |
| 2 MPa | 203943.2426 mmH₂O |
| 2.5 MPa | 254929.0532 mmH₂O |
| 5 MPa | 509858.1065 mmH₂O |
| 7 MPa | 713801.3491 mmH₂O |
| 10 MPa | 1019716.213 mmH₂O |
| 15 MPa | 1529574.319 mmH₂O |
| 20 MPa | 2039432.426 mmH₂O |
| 25 MPa | 2549290.532 mmH₂O |
| 30 MPa | 3059148.639 mmH₂O |
| 40 MPa | 4078864.852 mmH₂O |
| 50 MPa | 5098581.065 mmH₂O |
| 70 MPa | 7138013.491 mmH₂O |
| 100 MPa | 10197162.13 mmH₂O |
| 200 MPa | 20394324.26 mmH₂O |
| 250 MPa | 25492905.32 mmH₂O |
| 355 MPa | 36199925.56 mmH₂O |
| 500 MPa | 50985810.65 mmH₂O |
Where it's used
Megapascals are used for concrete compressive strength (typically 20–50 MPa), 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.
Megapascal to other pressure units
| Conversion | 1 MPa equals |
|---|---|
| megapascal to pascal | 1000000 Pa |
| megapascal to kilopascal | 1000 kPa |
| megapascal to psi | 145.0377377 psi |
| megapascal to bar | 10 bar |
| megapascal to millibar | 10000 mbar |
| megapascal to decibar | 100 dbar |
| megapascal to torr | 7500.616827 Torr |
| megapascal to millimeter of mercury | 7500.615758 mmHg |
| megapascal to millimeter of water | 101971.6213 mmH₂O |
| megapascal to centimeter of water | 10197.16213 cmH₂O |
| megapascal to inch of water | 4014.63076 inH₂O |
| megapascal to inch of water (60 °F) | 4018.64652 inH₂O (60 °F) |
| megapascal to inch of mercury | 295.299833 inHg |
| megapascal to atmosphere | 9.869232667 atm |
| megapascal to barye | 10000000 Ba |
Frequently asked questions
How many millimeters of water are in 1 megapascal?
1 MPa = 101971.6213 mmH₂O.
How do I convert megapascals to millimeters of water?
Multiply the value in MPa by 101971.6213. For example, 15 MPa × 101971.6213 = 1529574.319 mmH₂O.
Is the MPa 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 Megapascals to Millimeters of Water. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/megapascal-to-millimeter-of-water/
IEEE
Scientific Converters, "Convert Megapascals to Millimeters of Water," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/megapascal-to-millimeter-of-water/