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Equivalent pressure value
Accurate pressure conversion tool for millimetres of mercury and pascals
Convert mmHg to Pascals instantly with precise calculations. Includes bidirectional conversion and detailed breakdowns for all major pressure units in 2026.
Professional pressure conversion for science, medicine, and engineering
Convert millimetres of mercury (mmHg) to pascals (Pa) with full precision using the exact conversion factor of 133.322 Pa per mmHg. Our tool delivers reliable results for scientific, medical, and engineering applications.
Switch seamlessly between mmHg to Pa and Pa to mmHg conversion modes. Instantly see results across multiple pressure units including kilopascals, atmospheres, and bar — all from a single input.
Perfect for blood pressure readings, weather forecasting, laboratory work, HVAC engineering, and any professional or academic scenario requiring precise pressure unit conversions between mmHg and SI units.
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The millimetre of mercury (mmHg) is a pressure unit historically defined by the height of a mercury column in a barometer. One mmHg equals exactly 133.322387415 pascals, a value derived from the density of mercury (13,595.1 kg/m³), standard gravity (9.80665 m/s²), and a 0.001 m column height. The pascal (Pa) is the SI unit of pressure, defined as one newton per square metre, and is the standard unit used in science and engineering worldwide.
The relationship between mmHg and Pa is important across many fields. In medicine, blood pressure is measured in mmHg (e.g., 120/80 mmHg), while engineering calculations commonly use pascals or kilopascals. Standard atmospheric pressure at sea level equals 760 mmHg, which is equivalent to 101,325 Pa or 101.325 kPa. Understanding this conversion is essential for professionals working across different pressure measurement systems.
Example: 760 mmHg × 133.322387415 = 101,325 Pa (1 standard atmosphere)
Standard atmosphere = 760 mmHg = 101,325 Pa | Normal systolic blood pressure = 120 mmHg = 15,999 Pa
| mmHg | Pascals (Pa) | Kilopascals (kPa) | Atmospheres (atm) | Bar |
|---|---|---|---|---|
| 1 mmHg | 133.322 Pa | 0.133322 kPa | 0.001316 atm | 0.001333 bar |
| 5 mmHg | 666.612 Pa | 0.666612 kPa | 0.006579 atm | 0.006666 bar |
| 10 mmHg | 1,333.22 Pa | 1.33322 kPa | 0.013158 atm | 0.013332 bar |
| 20 mmHg | 2,666.45 Pa | 2.66645 kPa | 0.026316 atm | 0.026645 bar |
| 50 mmHg | 6,666.12 Pa | 6.66612 kPa | 0.065789 atm | 0.066612 bar |
| 100 mmHg | 13,332.24 Pa | 13.33224 kPa | 0.131579 atm | 0.133322 bar |
| 120 mmHg | 15,998.69 Pa | 15.99869 kPa | 0.157895 atm | 0.159987 bar |
| 200 mmHg | 26,664.48 Pa | 26.66448 kPa | 0.263158 atm | 0.266645 bar |
| 300 mmHg | 39,996.72 Pa | 39.99672 kPa | 0.394737 atm | 0.399967 bar |
| 500 mmHg | 66,661.19 Pa | 66.66119 kPa | 0.657895 atm | 0.666612 bar |
| 760 mmHg | 101,325.00 Pa | 101.325 kPa | 1.000000 atm | 1.01325 bar |
| 1,000 mmHg | 133,322.39 Pa | 133.32239 kPa | 1.315789 atm | 1.333224 bar |
Blood pressure readings are universally expressed in mmHg (e.g., 120/80 mmHg). Converting to pascals is required when interfacing with biomedical engineering systems, scientific research papers, or any application using SI units for pressure reporting.
Atmospheric pressure in weather forecasting is commonly expressed in mmHg or millibar. Converting mmHg to pascals (or hectopascals, hPa) aligns readings with international meteorological standards used by agencies such as the World Meteorological Organization.
Physics and chemistry experiments require pressure values in SI units (pascals). Converting mmHg readings from manometers and barometers to Pa ensures compatibility with equations, data analysis software, and standardised scientific reporting formats.
HVAC systems, vacuum technology, and fluid dynamics calculations routinely require converting between mmHg and pascals. Accurate conversion ensures safe system design, correct pressure ratings, and compliance with engineering standards and specifications.
Standard atmospheric pressure = 760 mmHg = 101,325 Pa = 101.325 kPa. This is the baseline reference for all pressure unit systems and is used to define 1 atmosphere (atm).
Normal systolic blood pressure (120 mmHg) = 15,998.69 Pa ≈ 16 kPa. Normal diastolic blood pressure (80 mmHg) = 10,665.79 Pa ≈ 10.7 kPa.
The mmHg and Torr are nearly identical but not exactly equal. 1 Torr = 133.3224 Pa, while 1 mmHg = 133.322387415 Pa. For most practical purposes they are interchangeable, but scientific work may require distinguishing between them.
Manual conversion between mmHg and pascals is straightforward using the fixed conversion factor. To convert mmHg to Pa, multiply the mmHg value by 133.322387415. To convert Pa back to mmHg, divide the pascal value by 133.322387415. This conversion factor is derived from physical constants and remains constant regardless of the pressure magnitude.
For quick mental estimates, you can use the rounded factor of 133.3. This gives results accurate to within 0.02%, which is sufficient for most everyday applications. For medical or scientific reporting, always use the full precision factor of 133.322387415 to meet accuracy standards. You can also explore atmospheres to pascals conversion for related pressure unit calculations.
The pascal is the SI unit of pressure used globally in science, engineering, and meteorology. Understanding the relationship between Pa, kPa, and other units is essential for accurate technical work.
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