Pressure Converter
Convert between Pascal, PSI, Bar, Atmosphere, Torr, and mmHg pressure units. Get instant accurate conversions with helpful pressure references and validation.
Pressure Input
SI base unit of pressure
Quick Set
Enter a Pressure
Please enter a pressure value to see instant conversions across all pressure units with helpful references and validation.
How to Convert Pressure
Enter Pressure
Type any pressure value in the input field. Supports positive numbers with decimals for precise measurements.
Select Unit
Choose from Pascal (Pa), PSI, Bar, Atmosphere (atm), Torr, or mmHg as your input unit.
View Conversions
Get instant conversions to all pressure units with color-coded results and helpful descriptions.
Copy Results
Click copy buttons to save converted values to clipboard for use in engineering and scientific applications.
Understanding Pressure Units
Pascal (Pa)
The SI base unit of pressure, defined as one newton per square meter.
- • Scientific and engineering standard
- • Very small unit, often used with prefixes
- • 1 Pa = 1 N/m²
- • Used in meteorology and physics
PSI (Pounds per Square Inch)
Common imperial pressure unit used in automotive and industrial applications.
- • Automotive tire pressure
- • Industrial machinery
- • Hydraulic systems
- • HVAC applications
Bar
Metric pressure unit approximately equal to atmospheric pressure at sea level.
- • Weather and meteorology
- • Scuba diving and underwater
- • Industrial processes
- • 1 bar ≈ 1 atmosphere
Atmosphere (atm)
Standard atmospheric pressure at sea level, used as a reference point.
- • Reference standard pressure
- • Gas pressure measurements
- • Scientific calculations
- • 1 atm = 101,325 Pa
Torr & mmHg
Vacuum measurement units based on mercury column height.
- • Vacuum technology
- • Medical blood pressure
- • Laboratory applications
- • 1 Torr = 1 mmHg (approximately)
Inch of Mercury (inHg)
Used in weather reporting and barometric pressure measurements.
- • Weather forecasting
- • Barometric readings
- • Aviation altimetry
- • US weather services
Pressure Converter Applications
Engineering & Industrial
Essential for engineers working with hydraulics, pneumatics, and pressure systems.
- • Hydraulic system design
- • Pneumatic equipment specifications
- • Industrial process control
- • Safety valve calculations
Automotive & Transportation
Critical for automotive maintenance and transportation systems.
- • Tire pressure monitoring
- • Engine compression testing
- • Brake system maintenance
- • Turbocharger specifications
Scientific Research
Essential for laboratory work and scientific measurements.
- • Vacuum chamber operations
- • Gas chromatography
- • Atmospheric research
- • Material testing under pressure
Medical & Healthcare
Important for medical equipment and patient monitoring systems.
- • Blood pressure measurements
- • Respiratory equipment calibration
- • Medical gas systems
- • Hyperbaric chamber operations
Pressure Conversion FAQ
What's the difference between absolute and gauge pressure?
Absolute pressure is measured relative to perfect vacuum (zero pressure), while gauge pressure is measured relative to atmospheric pressure. Our converter works with absolute pressure values.
Why are there so many different pressure units?
Different industries and regions developed their own pressure units based on practical needs. Pascal is the international standard, but PSI, Bar, and mmHg remain common in specific applications.
How accurate are the pressure conversions?
Our conversions use precise mathematical relationships and display results to 6 decimal places, providing accuracy suitable for scientific and engineering applications.
Can I convert negative pressure values?
No, absolute pressure cannot be negative. For vacuum measurements below atmospheric pressure, use positive values in appropriate units like Torr or mmHg.
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