Pressure Converter 🔧
Free online pressure unit converter. Convert PSI, bar, kPa, atm, Pascal, mmHg and 30+ pressure units instantly. Includes PSI to bar, kPa to PSI, bar to kPa calculator with formulas.
📐 Conversion Formula
Common Pressure Conversions
Quick Pressure Conversions
PSI to Bar
× 0.0689476
1 PSI = 0.069 bar
Bar to PSI
× 14.5038
1 bar = 14.5 PSI
kPa to PSI
× 0.145038
100 kPa = 14.5 PSI
PSI to kPa
× 6.89476
30 PSI = 206.8 kPa
Converter Performance Metrics
How to Use Pressure Converter
Step 1: Enter Pressure Value
Type the pressure value you want to convert in the "From" field. The converter accepts any positive or negative number including decimals. For example, enter 30 for 30 PSI or 2.5 for 2.5 bar depending on your selected unit.
Step 2: Select Source Unit
Choose the unit of your input pressure from the "From" dropdown. Options include PSI, bar, kPa, atm, Pascal, mmHg, torr and 30+ other pressure units. Select the unit that matches your measurement for accurate conversion.
Step 3: Select Target Unit
Pick the unit you want to convert to from the "To" dropdown. The conversion happens automatically in real-time as you change units. The formula used for conversion is displayed below the converter for reference and verification.
Step 4: Use Results
View the converted result in the "To" field. Click Copy to copy the result to clipboard, Swap to reverse conversion direction, or Reset to start over. All calculations are instant and highly accurate.
Understanding Pressure Units
What is Pressure?
Pressure is force applied perpendicular to a surface per unit area. The SI unit is Pascal (Pa), defined as one newton per square meter. Pressure is fundamental to physics, engineering, meteorology, and many industrial applications. Higher pressure means greater force concentrated on smaller area.
Formula: Pressure \( P = \frac{F}{A} \) where \( F \) is force in newtons and \( A \) is area in square meters. For fluid pressure: \( P = \rho g h \) where \( \rho \) is density, \( g \) is gravity, \( h \) is height. Atmospheric pressure at sea level: \( 1 \text{ atm} = 101,325 \text{ Pa} = 14.696 \text{ PSI} = 1.01325 \text{ bar} \).
Common Pressure Units Explained
PSI (Pounds per Square Inch): Imperial unit measuring force in pounds over one square inch. Common in USA for tire pressure, hydraulics, pneumatics. Conversion: \( 1 \text{ PSI} = 6,894.76 \text{ Pa} = 0.0689476 \text{ bar} \). Tire pressure typically 30-35 PSI.
Bar: Metric unit equal to 100,000 Pascals. Approximately equal to atmospheric pressure at sea level. Common in Europe for tire pressure, weather reports. Conversion: \( 1 \text{ bar} = 100,000 \text{ Pa} = 14.5038 \text{ PSI} \). Practical unit for engineering applications.
kPa (Kilopascal): 1,000 Pascals. Standard metric pressure unit in many countries. Used for tire pressure in Canada, Australia. Conversion: \( 1 \text{ kPa} = 1,000 \text{ Pa} = 0.145038 \text{ PSI} = 0.01 \text{ bar} \). Weather pressure 95-105 kPa at sea level.
Common Use Cases
🚗 Automotive & Tires
Convert tire pressure between PSI, bar, and kPa for vehicle maintenance. Different regions use different units—USA uses PSI, Europe uses bar, Australia uses kPa. Proper tire pressure improves fuel efficiency, safety, and tire longevity. Typical car tires: 30-35 PSI (2.0-2.4 bar).
🏭 Industrial Engineering
Convert pressure for hydraulic systems, pneumatic tools, compressors, and industrial equipment. Engineers work with PSI, bar, MPa depending on application and location. Critical for safety specifications, equipment ratings, and international collaborations. Hydraulic systems often 1000-3000 PSI.
🌡️ HVAC & Refrigeration
Convert refrigerant pressures, vacuum levels, and system pressures for air conditioning and refrigeration systems. Technicians use PSI gauges but specifications may be in kPa or bar. Essential for proper system charging, troubleshooting, and compliance with manufacturer specifications.
⚕️ Medical Equipment
Convert blood pressure readings (mmHg), oxygen cylinder pressures (PSI/bar), and vacuum suction levels. Medical equipment uses various pressure units depending on application and region. Critical for patient safety, equipment calibration, and maintaining proper medical gas delivery systems.
🌦️ Weather & Meteorology
Convert atmospheric pressure between millibars (mbar), inches of mercury (inHg), and kPa for weather forecasting. Standard sea-level pressure: 1013.25 mbar = 29.92 inHg = 101.325 kPa. Understanding pressure systems helps predict weather patterns and storm development.
🎓 Education & Science
Students and researchers convert pressure units for physics, chemistry, and engineering coursework. Understanding unit relationships fundamental to scientific literacy. Essential for lab work, experimental data analysis, and comparing results across different measurement systems and publications.