Pressure Converter - Convert Between Pascals, PSI, Bars, Atmospheres and More
Free pressure converter tool for converting between pascals, kilopascals, megapascals, bars, millibars, PSI, atmospheres, torr, and more. Our converter supports metric, imperial, and other pressure units with instant real-time conversions. Perfect for engineering calculations, meteorology, automotive applications, and everyday pressure conversions.
Last updated: January 24, 2026
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How it works:
Enter a value in any field to convert to all other pressure units. Conversions update automatically as you type.
Pressure Units Supported
Definition
1 Pa = 1 N/m²
The standard unit of pressure in the International System of Units (SI)
Conversion
1 bar = 100,000 Pa
Widely used in meteorology, oceanography, and European engineering
Conversion
1 psi ≈ 6,895 Pa
Commonly used in US automotive, industrial, and hydraulic applications
Definition
1 atm = 101,325 Pa
Standard sea-level atmospheric pressure, used as a reference point
Conversion
1 torr ≈ 133.32 Pa
Commonly used in vacuum measurements and scientific applications
Available units
kPa, MPa, mbar, hPa, mmHg, inHg, kgf/cm², psf
Includes kilopascals, megapascals, millibars, hectopascals, and more
Quick Example Result
For 1 atmosphere (standard atmospheric pressure):
Pascals
101,325 Pa
Bars
1.013 bar
PSI
14.70 psi
Torr
760 torr
How Our Pressure Converter Works
Our pressure converter uses precise conversion factors based on official unit definitions to convert between different pressure measurement systems. All conversions are calculated in real-time as you type, ensuring instant and accurate results for engineering, meteorology, automotive, and scientific applications.
Pressure Conversion Formulas
1 bar = 100,000 pascals (Pa)1 PSI = 6,894.7572932 pascals (Pa)1 atmosphere (atm) = 101,325 pascals (Pa)1 torr = 133.3223684 pascals (Pa)1 kilopascal (kPa) = 1,000 pascals (Pa)1 megapascal (MPa) = 1,000,000 pascals (Pa)All conversions are based on official unit definitions from international standards. The converter uses these precise factors to ensure accurate conversions between metric, imperial, and other pressure units.
Understanding Pressure
Pressure is a fundamental physical quantity that measures the force applied perpendicular to a surface per unit area. It's essential in many fields: engineers use pressure measurements in hydraulic systems, meteorologists track atmospheric pressure for weather forecasting, and automotive technicians monitor tire pressure for safety.
- Pressure = Force ÷ Area: The basic formula for calculating pressure
- Pascal (Pa): SI unit representing 1 newton per square meter
- Bar: Metric unit equal to 100,000 pascals, approximately atmospheric pressure
- PSI: Imperial unit representing pounds-force per square inch
- Atmosphere (atm): Standard sea-level atmospheric pressure reference
- Torr: Unit commonly used in vacuum measurements
Practical Applications
Pressure conversion is essential in many practical scenarios. Automotive mechanics convert between PSI and bars when working with tire pressure specifications. Engineers convert units when using equipment calibrated in different systems. Meteorologists convert between millibars and pascals when analyzing weather data.
Common Use Cases:
- • Automotive: Converting tire pressure between PSI and bars
- • Engineering: Converting hydraulic system pressures between different unit systems
- • Meteorology: Converting atmospheric pressure measurements for weather analysis
- • Manufacturing: Converting pressure specifications for industrial equipment
- • Scientific research: Converting pressure measurements in laboratory experiments
- • Scuba diving: Understanding pressure at different depths
Atmospheric Pressure
Atmospheric pressure, also called air pressure, is the force exerted per unit area by the weight of air in the atmosphere. At sea level, standard atmospheric pressure is approximately 101,325 pascals (101.325 kPa), which equals 1 atmosphere, 1.01325 bars, or 14.6959 PSI. Atmospheric pressure decreases with altitude, which is why pressure measurements are important for aviation, mountaineering, and weather forecasting.
Sources & References
- International System of Units (SI) - Bureau International des Poids et Mesures (BIPM)Official definition of the pascal and other SI units
- NIST Guide for the Use of the International System of Units - National Institute of Standards and TechnologyComprehensive reference for unit conversions and pressure measurements
- Khan Academy - Pressure and FluidsEducational resources for understanding pressure concepts
Need help with other conversions? Check out our force converter and weight converter.
Get Custom Calculator for Your PlatformPressure Converter Examples
Input:
- Pressure: 2.5 bars
- Conversion factor: 1 bar = 14.5038 PSI
Results:
- PSI: 2.5 × 14.5038 = 36.26 PSI
- Pascals: 2.5 × 100,000 = 250,000 Pa
- Kilopascals: 2.5 × 100 = 250 kPa
- Atmospheres: 2.5 ÷ 1.01325 = 2.47 atm
Result: 2.5 bars equals 36.26 PSI
This conversion is commonly used in automotive applications when working with tire pressure specifications that use different unit systems.
PSI to Pascals
30 PSI = ?
30 PSI = 206,843 Pa
Atmospheres to Bars
1.5 atm = ?
1.5 atm ≈ 1.52 bar
Frequently Asked Questions
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