Pressure Unit Converter

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Pressure Conversion for All Needs

Convert between all standard pressure units with our precise converter. Whether you need to convert pascals to psi, bar to atmospheres, or torr to millimeters of mercury, our tool handles all common pressure units used in science, engineering, weather forecasting, and many other fields.

Common Pressure Conversions

  • 1 atmosphere (atm) = 101,325 pascals (exact)
  • 1 bar = 100,000 pascals (exact)
  • 1 psi = 6,894.76 pascals
  • 1 torr = 133.322 pascals
  • 1 mmHg = 133.322 pascals
  • 1 inch Hg = 3,386.39 pascals

Pressure Units and Standards

The pascal (Pa) is the SI unit for pressure, defined as one newton per square meter:

  • Pascal (Pa): Base SI unit
  • Kilopascal (kPa): 1,000 pascals
  • Megapascal (MPa): 1,000,000 pascals
  • Bar: 100,000 pascals

Understanding Pressure Measurements

Pressure is the force applied perpendicular to a surface per unit area. It's a fundamental physical quantity that plays a critical role in numerous fields, from weather forecasting to engineering, from medical diagnostics to deep-sea exploration. Different pressure units emerged from various historical contexts and applications.

Precision: 15 decimal places
Standard: ISO 80000-4:2019

Pressure Units in Different Fields

Scientific and Engineering Units

Units commonly used in scientific and engineering contexts:

  • Pascal (Pa): SI unit, newton per square meter
  • Bar: Approximately atmospheric pressure at sea level
  • Atmosphere (atm): Based on average sea-level pressure
  • Pounds per square inch (psi): Common in US engineering

Meteorological Pressure Units

Units traditionally used in weather forecasting:

  • Millibar (mbar): Equal to 100 pascals
  • Inches of mercury (inHg): Used in US weather reports
  • Millimeters of mercury (mmHg): Used in European forecasts
  • Hectopascal (hPa): Modern meteorological standard

Medical and Specialized Pressure Units

Units used in specific applications:

  • Torr: Used in vacuum technology, nearly equal to mmHg
  • cmH₂O (centimeters of water): Used in medical contexts
  • Inches of water column: Used in HVAC systems
  • Gigapascal (GPa): Used in material science

Reference Pressure Values

Common Reference Pressures

  • Standard atmosphere at sea level: 101,325 Pa (1 atm)
  • Typical car tire pressure: 30-35 psi (207-241 kPa)
  • Typical blood pressure (systolic): 120 mmHg (16 kPa)
  • Champagne bottle: 5-6 atm (505-608 kPa)
  • Deep ocean (4000m depth): ~400 atm (40.5 MPa)