Pressure Converter
Convert pressure units: Pascals (Pa), Bar, PSI (Pounds per Square Inch), Atmospheres (atm), and Torr.
Pressure Converter: Pascals, Bar, PSI, Atmospheres, Torr & mmHg
Pressure measurement is central to mechanical engineering, scuba diving, aviation altimeters, meteorological barometry, automotive tire maintenance, and industrial hydraulics. Different industries rely on historical conventions: tire shops quote Pounds per Square Inch (PSI), meteorologists measure in millibars (mbar) or hectopascals (hPa), scuba divers monitor Bar, and medical blood pressure cuffs measure millimeters of mercury (mmHg).
ToolQix Pressure Converter bridges all industrial, clinical, and meteorological pressure scales. Seamlessly convert between Pascals (Pa), Kilopascals (kPa), Megapascals (MPa), Bar, Millibar, Atmospheres (atm), PSI (lbf/in²), Torr, and Millimeters of Mercury (mmHg).
Pascal (N/m²) Base Standard & Force per Area Ratios
Pressure is defined as force applied perpendicularly to a surface per unit area (P = F/A). In the SI system, the base unit is the Pascal (Pa), equivalent to one Newton per square meter (1 N/m²). Standard atmospheric pressure at sea level is legally defined as exactly 101,325 Pa (1.01325 bar or 14.6959 PSI).
How to Use Pressure Converter Step-by-Step
Select Source & Target Pressure Units
Choose your input unit (e.g., PSI) and desired destination unit (e.g., Bar or kPa).
Input Pressure Reading
Enter any numeric pressure value into the input field.
Review Simultaneous Multi-Scale Results
View the converted pressure across engineering, meteorological, and medical scales.
Copy Converted Pressure
Copy your result directly to the clipboard with customizable decimal precision.
Pressure Converter Industry Use Cases
Automotive Tire Pressure Maintenance
Convert recommended tire pressure ratings between PSI (US standard) and Bar (European standard).
Scuba Diving Cylinder Management
Translate cylinder tank fill pressures between 3,000 PSI and 200/300 Bar.
Meteorological Barometric Weather
Convert barometric weather pressures between hectopascals (hPa), millibars, and inches of mercury (inHg).
Clinical Blood Pressure Monitoring
Verify medical sphygmomanometer readings in millimeters of mercury (mmHg) against kilopascals (kPa).
Pressure Converter Best Practices & Tips
- Always verify whether a pressure gauge measures Gauge Pressure (psig / barg, relative to atmospheric pressure) or Absolute Pressure (psia / bara, relative to perfect vacuum).
- Standard atmospheric sea-level pressure is 14.7 PSI (1.013 bar, 101.3 kPa, or 760 mmHg).
- For automotive tires, checking pressure when tires are cold gives the most accurate baseline reading.
- In medical literature, blood pressure of 120/80 mmHg corresponds to approximately 16.0 / 10.7 kPa.
Standard Pressure Unit Conversion Multipliers
| Pressure Unit | Symbol | Pascals (Pa) | Bar | PSI | Atmospheres (atm) |
|---|---|---|---|---|---|
| Pascal (SI Base) | Pa | 1.0 Pa | 0.00001 bar | 0.000145 psi | 0.00000987 atm |
| Kilopascal | kPa | 1,000 Pa | 0.01 bar | 0.145038 psi | 0.009869 atm |
| Bar | bar | 100,000 Pa | 1.0 bar | 14.5038 psi | 0.986923 atm |
| Atmosphere (Standard) | atm | 101,325 Pa | 1.01325 bar | 14.6959 psi | 1.0 atm |
| Pound per Square Inch | psi | 6,894.76 Pa | 0.068948 bar | 1.0 psi | 0.068046 atm |
| Torr / mmHg | Torr | 133.322 Pa | 0.001333 bar | 0.019337 psi | 0.001316 atm |
FAQs About Pressure Converter
What is the difference between gauge pressure and absolute pressure?
Gauge pressure measures pressure relative to the surrounding ambient atmosphere (a flat tire reads 0 PSI gauge). Absolute pressure measures pressure relative to a perfect vacuum, which is gauge pressure plus atmospheric pressure (~14.7 PSI at sea level).
How many PSI are in 1 Bar?
One bar equals approximately 14.5038 PSI. To convert bar to PSI, multiply by 14.5038. For example, a typical European tire pressure of 2.2 bar is approximately 32 PSI.
Why is blood pressure measured in mmHg?
Historically, the earliest accurate medical pressure gauges (sphygmomanometers) measured how high a column of dense liquid mercury (Hg) was lifted by the pressure of blood pumped by the heart. The convention persists worldwide.
What is 1 Atmosphere of pressure in everyday terms?
One atmosphere (1 atm) is the weight of Earth's atmosphere pushing down on every square inch of surface at sea level, equal to 14.7 pounds per square inch (or about 1 kilogram per square centimeter).
Is any calculation data sent across the web?
No. All conversions execute 100% locally in your web browser with zero server data collection.
Tested Methodology & Client-Side Processing
Reviewed: October 21, 2026Calculations, algorithms, and transformations in this utility run directly in your browser without sending your private inputs to remote processing servers. Formulas reference established technical specifications and official documentation under our Editorial & Testing Policy.