Millimeter of Mercury
mmHg
Commonly Used Scientific Unit
The millimeter of mercury is a unit of pressure based on the pressure exerted by a 1 mm tall column of mercury at 0°C. It's the standard unit for blood pressure measurement worldwide.
Quick Converter
Millimeter of Mercury (mmHg)
The millimeter of mercury is a unit of pressure based on the pressure exerted by a 1 mm tall column of mercury at 0°C. It’s the standard unit for blood pressure measurement worldwide.
Characteristics
- Medical standard: blood pressure readings (e.g., 120/80 mmHg)
- Standard atmosphere: exactly 760 mmHg at sea level
- Equivalent to: 1 Torr (within 0.000015%)
- 1 mmHg = 133.322 Pa
- Based on: mercury column height at 0°C
Applications
- Blood pressure measurement (sphygmomanometry)
- Medical vacuum and respiratory equipment
- Scientific pressure measurements
- Cardiovascular physiology
Conversions
- 1 mmHg = 0.133322 kPa
- 1 mmHg ≈ 1 Torr (technically 1 Torr = 1/760 atm)
- 1 mmHg = 0.00131579 atm
- 1 mmHg = 0.0193368 psi
- 760 mmHg = 1 atm (standard atmosphere)
Related Units
Used In Regions
Medical International Scientific