Convert Millimeters of Mercury to N/mm²
1 millimeter of mercury (mmHg) = 0.0001333223874 newtons per square millimetre (N/mm²). 1 N/mm² = 7500.615758 mmHg. Example: 15 mmHg = 15 × 0.0001333223874 = 0.001999835811 N/mm².
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1 mmHg = 0.0001333223874 N/mm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimeter of mercury to newton per square millimetre converter to paste a column from Excel.
How to Convert Millimeter of Mercury to Newton per Square Millimetre
- 1 mmHg = 0.0001333223874 N/mm²
- 1 N/mm² = 7500.615758 mmHg
- Example: convert 15 mmHg to N/mm²: 15 mmHg = 15 × 0.0001333223874 N/mm² = 0.001999835811 N/mm²
Reference conditions. mmHg: Conventional mercury column: ρ = 13 595.1 kg/m³ and gₙ = 9.80665 m/s² (≈ mercury at 0 °C / 32 °F).
Formula
N/mm² = mmHg × 0.000133322387415
or N/mm² = mmHg ÷ 7500.615758457
Derivation from SI units:
- 1 mmHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.001 m = 133.322387415 Pa
- 1 N/mm² = 1 N ÷ 10⁻⁶ m² = 10⁶ Pa = 1 MPa
- 1 mmHg = 133.322387415 Pa ÷ 1000000 Pa per N/mm² = 0.000133322387415 N/mm²
Both units are defined exactly, so the factor is exact. Millimeter of Mercury definition: millimeter of mercury; Newton per Square Millimetre definition: newton per square millimetre.
Worked examples
- A reading of 80 mmHg converts to 0.01066579099 N/mm².
80 mmHg × 0.0001333223874 = 0.01066579099 N/mm² - A value of 160 mmHg is 0.02133158199 N/mm².
160 mmHg × 0.0001333223874 = 0.02133158199 N/mm²
Millimeter of Mercury to Newton per Square Millimetre conversion table
| Millimeters of Mercury (mmHg) | Newtons per Square Millimetre (N/mm²) |
|---|---|
| 1 mmHg | 0.0001333223874 N/mm² |
| 5 mmHg | 0.0006666119371 N/mm² |
| 10 mmHg | 0.001333223874 N/mm² |
| 20 mmHg | 0.002666447748 N/mm² |
| 40 mmHg | 0.005332895497 N/mm² |
| 60 mmHg | 0.007999343245 N/mm² |
| 70 mmHg | 0.009332567119 N/mm² |
| 80 mmHg | 0.01066579099 N/mm² |
| 90 mmHg | 0.01199901487 N/mm² |
| 100 mmHg | 0.01333223874 N/mm² |
| 110 mmHg | 0.01466546262 N/mm² |
| 120 mmHg | 0.01599868649 N/mm² |
| 130 mmHg | 0.01733191036 N/mm² |
| 140 mmHg | 0.01866513424 N/mm² |
| 160 mmHg | 0.02133158199 N/mm² |
| 180 mmHg | 0.02399802973 N/mm² |
| 200 mmHg | 0.02666447748 N/mm² |
| 300 mmHg | 0.03999671622 N/mm² |
| 500 mmHg | 0.06666119371 N/mm² |
| 750 mmHg | 0.09999179056 N/mm² |
| 760 mmHg | 0.1013250144 N/mm² |
Where it's used
Millimeters of Mercury are used for blood pressure (e.g. 120/80 mmHg), 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 Mercury to other pressure units
| Conversion | 1 mmHg equals |
|---|---|
| millimeter of mercury to newton per square millimetre | 0.0001333223874 N/mm² |
| millimeter of mercury to pascal | 133.3223874 Pa |
| millimeter of mercury to kilopascal | 0.1333223874 kPa |
| millimeter of mercury to ksi | 0.00001933677746 ksi |
| millimeter of mercury to kilogram-force per square centimetre | 0.00135951 kgf/cm² |
| millimeter of mercury to psi | 0.01933677746 psi |
| millimeter of mercury to bar | 0.001333223874 bar |
| millimeter of mercury to inch of water | 0.5352401575 inH₂O |
Show 12 more units
| millimeter of mercury to atmosphere | 0.001315789661 atm |
|---|---|
| millimeter of mercury to megapascal | 0.0001333223874 MPa |
| millimeter of mercury to gigapascal | 1.333223874 × 10⁻⁷ GPa |
| millimeter of mercury to kilogram-force per square millimetre | 0.0000135951 kgf/mm² |
| millimeter of mercury to millibar | 1.333223874 mbar |
| millimeter of mercury to torr | 1.000000142 Torr |
| millimeter of mercury to millimeter of water | 13.5951 mmH₂O |
| millimeter of mercury to centimeter of water | 1.35951 cmH₂O |
| millimeter of mercury to inch of mercury | 0.03937007874 inHg |
| millimeter of mercury to decibar | 0.01333223874 dbar |
| millimeter of mercury to inch of water (60 °F) | 0.5357755482 inH₂O (60 °F) |
| millimeter of mercury to barye | 1333.223874 Ba |
Frequently asked questions
How many newtons per square millimetre are in 1 millimeter of mercury?
1 mmHg = 0.0001333223874 N/mm².
How do I convert millimeters of mercury to newtons per square millimetre?
Multiply the value in mmHg by 0.0001333223874, or divide it by 7500.615758. For example, 15 mmHg × 0.0001333223874 = 0.001999835811 N/mm².
Is the mmHg to N/mm² 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 mercury, conventional (mmHg)".
- 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 Mercury to N/mm². Retrieved October 25, 2026, from https://scientificconverters.com/pressure/millimeter-of-mercury-to-newton-per-square-millimeter/
IEEE
Scientific Converters, "Convert Millimeters of Mercury to N/mm²," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/millimeter-of-mercury-to-newton-per-square-millimeter/