Pressure measurement is crucial in countless industrial, scientific, and everyday applications. Our advanced pressure converter provides instant, accurate conversions between all major pressure units used in engineering, meteorology, medicine, and more. Whether you're working with hydraulic systems, tire pressures, or weather data, our tool eliminates conversion errors and saves valuable time.
Real-time Calculation
See all converted values update instantly as you type, with no need to submit forms
Unit History
Your last used units are automatically saved for your next session
Mobile Optimized
Works flawlessly on all devices from desktops to smartphones
Common Use Cases
Automotive Applications
Convert between PSI, bar, and kPa for tire pressures, fuel systems, and turbocharger boost measurements. Proper pressure conversion ensures optimal vehicle performance and safety.
Medical Equipment
Accurate mmHg to kPa conversions are essential for blood pressure monitors, ventilators, and other life-saving medical devices where precision matters.
Industrial Processes
Convert between different pressure units for hydraulic systems, pneumatic controls, and process instrumentation in manufacturing plants.
Weather Forecasting
Meteorologists frequently convert between inHg, bar, and hPa when analyzing atmospheric pressure data and weather patterns.
Supported Pressure Units
Unit
Symbol
Common Uses
Equivalent to 1 atm
Pascal
Pa
Scientific research, SI unit
101,325 Pa
Bar
bar
Meteorology, scuba diving
1.01325 bar
Pounds per square inch
PSI
Automotive, industrial
14.6959 PSI
Atmosphere
atm
Physics, chemistry
1 atm
Torr
Torr
Vacuum systems, medicine
760 Torr
Millimeters of mercury
mmHg
Medical, barometric
760 mmHg
Benefits of Using Our Pressure Converter
Precision Engineering
Our conversion algorithms use industry-standard formulas to ensure laboratory-grade accuracy in all calculations, critical for sensitive applications like aerodynamics or medical equipment calibration.
Time-Saving Efficiency
Convert between six different pressure units simultaneously without manual calculations or reference tables, streamlining your workflow whether you're in the lab or field.
Global Standard Support
Seamlessly work with both metric (bar, kPa) and imperial (PSI, inHg) pressure units, making our tool indispensable for international projects and collaborations.
Expert Tips for Pressure Conversion
Understanding Absolute vs. Gauge Pressure
When converting pressure values, always verify whether your measurement is absolute pressure (measured against perfect vacuum) or gauge pressure (measured against atmospheric pressure). Our converter assumes absolute pressure by default. For gauge pressure conversions, simply subtract 1 atm (14.696 PSI or 101.325 kPa) from absolute values.
Altitude Considerations
Remember that atmospheric pressure decreases with altitude. At sea level, standard pressure is 1 atm (101.325 kPa), but this drops to about 83 kPa at 1,500m elevation. Always account for local atmospheric conditions in precision work.
Medical Pressure Conversions
In medical applications where mmHg is standard (like blood pressure), note that 1 mmHg = 1 Torr exactly. Our converter maintains this precise relationship for critical healthcare applications.
Pressure Conversion FAQs
PSI (pounds per square inch) typically refers to gauge pressure (PSIG), while PSIA indicates absolute pressure. The conversion between them requires adding or subtracting atmospheric pressure (14.696 PSI at sea level). Our converter works in absolute pressure by default.
While our tool focuses on standard pressure units, you can convert bar to meters of water column using the approximation 1 bar ≈ 10.197 meters of water head at 4°C. This is useful for hydrostatic pressure calculations in civil engineering.
Millimeters of mercury can be measured using different mercury densities. We use the standard definition where 1 mmHg = 133.322 Pa based on mercury density at 0°C. Some medical applications use slightly different values, but the difference is negligible for most purposes.
Our pressure converter uses NIST-standard conversion factors with 15 significant digits of precision, far exceeding most practical requirements. For scientific work, we recommend verifying critical conversions against authoritative sources.