Convert Millimeters of Mercury to Pascals
1 millimeter of mercury (mmHg) equals 133.3223874 pascals (Pa).
1 mmHg = 133.3223874 Pa
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimeter of mercury to pascal converter to paste a column from Excel.
How to Convert Millimeter of Mercury to Pascal
- 1 mmHg = 133.3223874 Pa
- 1 Pa = 0.007500615758 mmHg
- Example: convert 15 mmHg to Pa: 15 mmHg = 15 × 133.3223874 Pa = 1999.835811 Pa
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
Pa = mmHg × 133.322387415
Derivation from SI units:
- 1 mmHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.001 m = 133.322387415 Pa
- 1 Pa = 1 N/m² = 1 kg·m⁻¹·s⁻²
Both units are defined exactly, so the factor is exact. Millimeter of Mercury definition: millimeter of mercury; Pascal definition: pascal.
Worked examples
- A systolic blood pressure of 120 mmHg is 15998.68649 Pa above atmospheric.
120 mmHg × 133.3223874 = 15998.68649 Pa - A barometer reading of 760 mmHg equals 101325.0144 Pa.
760 mmHg × 133.3223874 = 101325.0144 Pa
Millimeter of Mercury to Pascal conversion table
| Millimeters of Mercury (mmHg) | Pascals (Pa) |
|---|---|
| 1 mmHg | 133.3223874 Pa |
| 5 mmHg | 666.6119371 Pa |
| 10 mmHg | 1333.223874 Pa |
| 20 mmHg | 2666.447748 Pa |
| 40 mmHg | 5332.895497 Pa |
| 60 mmHg | 7999.343245 Pa |
| 70 mmHg | 9332.567119 Pa |
| 80 mmHg | 10665.79099 Pa |
| 90 mmHg | 11999.01487 Pa |
| 100 mmHg | 13332.23874 Pa |
| 110 mmHg | 14665.46262 Pa |
| 120 mmHg | 15998.68649 Pa |
| 130 mmHg | 17331.91036 Pa |
| 140 mmHg | 18665.13424 Pa |
| 160 mmHg | 21331.58199 Pa |
| 180 mmHg | 23998.02973 Pa |
| 200 mmHg | 26664.47748 Pa |
| 300 mmHg | 39996.71622 Pa |
| 500 mmHg | 66661.19371 Pa |
| 750 mmHg | 99991.79056 Pa |
| 760 mmHg | 101325.0144 Pa |
Where it's used
Blood pressure, intraocular pressure and laboratory manometer data are in mmHg. Converting to pascals is required for SI-based physiology and biomedical engineering calculations.
Millimeter of Mercury to other pressure units
| Conversion | 1 mmHg equals |
|---|---|
| millimeter of mercury to pascal | 133.3223874 Pa |
| millimeter of mercury to kilopascal | 0.1333223874 kPa |
| millimeter of mercury to megapascal | 0.0001333223874 MPa |
| millimeter of mercury to psi | 0.01933677746 psi |
| millimeter of mercury to bar | 0.001333223874 bar |
| millimeter of mercury to millibar | 1.333223874 mbar |
| millimeter of mercury to decibar | 0.01333223874 dbar |
| 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 water | 0.5352401575 inH₂O |
| millimeter of mercury to inch of water (60 °F) | 0.5357755482 inH₂O (60 °F) |
| millimeter of mercury to inch of mercury | 0.03937007874 inHg |
| millimeter of mercury to atmosphere | 0.001315789661 atm |
| millimeter of mercury to barye | 1333.223874 Ba |
Frequently asked questions
Is mmHg the same as torr?
Almost. 1 mmHg = 133.322387415 Pa and 1 Torr = 133.3223684 Pa, a difference of about 0.14 parts per million.
How many pascals are in 1 millimeter of mercury?
1 mmHg = 133.3223874 Pa.
How do I convert millimeters of mercury to pascals?
Multiply the value in mmHg by 133.3223874. For example, 15 mmHg × 133.3223874 = 1999.835811 Pa.
Is the mmHg to Pa 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 Pascals. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/millimeter-of-mercury-to-pascal/
IEEE
Scientific Converters, "Convert Millimeters of Mercury to Pascals," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/millimeter-of-mercury-to-pascal/