What is the Pressure Converter?
The Pressure Converter is a professional tool that enables instant conversion between different units of pressure measurement. Whether you're working with Pascals, Bars, PSI, or Atmospheres, this converter delivers accurate results for engineering, scientific research, and everyday applications.
Who Needs This Tool?
Engineers
Scientists
Medical Professionals
Automotive Technicians
Divers & Pilots
Students
Supported Units
The converter supports a comprehensive range of 28 pressure units across multiple measurement systems:
Metric Pascal Units
- Pascal (Pa) — SI base unit of pressure
- Hectopascal (hPa) — Common in meteorology
- Kilopascal (kPa) — Practical engineering unit
- Megapascal (MPa) — High-pressure applications
- Gigapascal (GPa) — Material science and geology
Bar & Atmosphere Units
- Bar — Metric unit, approximately 1 atmosphere
- Millibar (mbar) — Weather and aviation
- Standard Atmosphere (atm) — Reference pressure at sea level
- Technical Atmosphere (at) — Engineering applications
Imperial Units
- Pound per Square Inch (psi) — US standard for tire pressure
- Kilopound per Square Inch (ksi) — Structural engineering
- Pound per Square Foot (psf) — Building loads and wind pressure
Mercury & Water Column Units
Mercury Column:
- Torr — Vacuum technology
- Millimeter of Mercury (mmHg) — Medical blood pressure
- Inch of Mercury (inHg) — US weather reports
Water Column:
- Millimeter of Water (mmH₂O) — Low-pressure measurements
- Centimeter of Water (cmH₂O) — HVAC systems
- Meter of Water (mH₂O) — Hydrostatic pressure
- Inch of Water (inH₂O) — Gas pressure measurement
- Foot of Water (ftH₂O) — Plumbing and water systems
Specialized Units
Metric Gravity-based:
- Kilogram per Square Centimeter (kg/cm²) — Legacy engineering unit
- Kilogram per Square Meter (kg/m²) — Surface loading
Newton-based:
- Newton per Square Meter (N/m²) — Equivalent to Pascal
- Newton per Square Millimeter (N/mm²) — Material stress
- Kilonewton per Square Meter (kN/m²) — Structural analysis
- Dyne per Square Centimeter (dyn/cm²) — CGS system
- 1. What is the Pressure Converter?
- 2. How to Use the Pressure Converter
- 3. Features
- 4. Frequently Asked Questions
- 4.1. What is the difference between Bar and PSI?
- 4.2. How do I convert tire pressure from PSI to Bar?
- 4.3. What is an Atmosphere (atm)?
- 4.4. Why is blood pressure measured in mmHg?
- 4.5. What is the difference between Torr and mmHg?
- 4.6. What pressure units are used in weather reports?
- 4.7. What is a Pascal?
- 4.8. How accurate are the conversions?
- 4.9. Why are my settings saved?
How to Use the Pressure Converter
Basic Conversion
Enter Your Value
Type a number in the input field. Numbers are automatically formatted with thousand separators for improved readability (e.g., 101,325 instead of 101325).
Select Source Unit
Choose your source unit from the dropdown menu. You can type to search for a specific unit quickly—just start typing "psi" or "pascal" to filter options.
View Instant Results
Results appear immediately below in all enabled units. No button clicks required—conversions update in real-time as you type.
Customizing Your Experience
Adjust Decimal Precision
Use the "Decimals" dropdown to control how many decimal places are displayed in results.
- Choose from 2, 4, 6, or 8 decimal places
- Select "Auto" for intelligent precision
- Higher precision for scientific calculations
- Lower precision for everyday use
Show/Hide Units
Click "Customize Units" to toggle which units appear in your results.
- Focus on units relevant to your field
- Group by metric, imperial, or atmospheric
- Hide rarely-used specialized units
- Settings saved automatically in browser
Copying Results
Copy Individual Result
- Click on any result row
- Value copied to clipboard instantly
- Clean format ready to paste
Copy All Results
- Use "Copy All Results" button
- All conversions copied at once
- Perfect for reports and documentation
Quick Reference
Not sure about a unit? Click "Unit Reference" to access a comprehensive table explaining each unit, its value relative to the base unit (Pascal), and common use cases. This built-in guide helps you understand unfamiliar units like Technical Atmosphere (at) or Dyne per Square Centimeter (dyn/cm²).
- Use higher precision (6-8 decimals) for scientific calculations requiring maximum accuracy
- For tire pressure, PSI and Bar are the most commonly used units worldwide
- For weather and altitude measurements, hPa (hectopascal) and inHg are industry standards
- For blood pressure readings, mmHg is the universal medical standard
- Standard atmospheric pressure at sea level: 101,325 Pa = 1 atm = 1.01325 bar = 14.7 psi
Features
Instant Conversion
Results update in real-time as you type. No button clicks or waiting required.
- Live calculation engine
- Zero processing delay
- Immediate visual feedback
Comprehensive Unit Support
Convert between 28 different pressure units spanning multiple measurement systems.
- Metric, imperial, atmospheric
- Specialized engineering units
- Medical and scientific standards
Smart Input Formatting
Large numbers automatically formatted with thousand separators for easy reading.
- Automatic number formatting
- Enhanced readability
- Error prevention
Searchable Unit Selection
Built-in search function helps you quickly find the unit you need.
- Type to filter units
- Search by name or symbol
- Fast navigation
Customizable Display
Choose which units appear in your results for a personalized experience.
- Toggle individual units
- Group by category
- Focus on relevant units
Precision Control
Select from multiple decimal precision options or use intelligent Auto mode.
- 2, 4, 6, or 8 decimal places
- Auto precision mode
- Scientific accuracy available
One-Click Copy
Copy individual results or all results at once in clean, ready-to-paste format.
- Single-click copying
- Bulk copy option
- Clean formatting
Unit Reference Guide
Built-in reference panel explains each unit's value and typical usage.
- Comprehensive unit descriptions
- Common use cases
- Conversion factors
Works Everywhere
Fully responsive design works seamlessly on desktop, tablet, and mobile devices.
- Mobile-optimized interface
- Touch-friendly controls
- Calculate anywhere, anytime
Frequently Asked Questions
What is the difference between Bar and PSI?
Bar is a metric unit where 1 bar equals 100,000 Pascals (approximately atmospheric pressure at sea level). PSI (Pound per Square Inch) is the imperial unit commonly used in the United States.
1 bar ≈ 14.5 psi
Bar is the standard in Europe and most of the world, while PSI remains the primary unit in the United States for applications like tire pressure and industrial equipment.
How do I convert tire pressure from PSI to Bar?
Enter your PSI value in the converter and look at the Bar result. For quick mental calculation: divide PSI by 14.5 to get Bar.
Most tire pressure gauges in Europe display Bar, while US gauges show PSI. Always check your vehicle's recommended pressure specification to use the correct unit.
What is an Atmosphere (atm)?
One Standard Atmosphere (atm) equals 101,325 Pascals—the average air pressure at sea level under standard conditions.
It's used as a reference point in:
- Diving: Pressure increases by 1 atm every 10 meters of depth
- Aviation: Altitude effects on atmospheric pressure
- Scientific contexts: Standard reference for experiments
At sea level, you experience approximately 1 atm of pressure from the weight of the atmosphere above you.
Why is blood pressure measured in mmHg?
mmHg (millimeters of mercury) is the traditional unit for blood pressure because early blood pressure measurement devices used mercury columns to indicate pressure levels.
A reading of "120/80 mmHg" means:
- Systolic pressure (120): Pressure when heart contracts, pushing mercury 120mm high
- Diastolic pressure (80): Pressure when heart relaxes, pushing mercury 80mm high
Despite modern digital devices, mmHg remains the universal medical standard for blood pressure measurement worldwide.
What is the difference between Torr and mmHg?
Torr and mmHg are nearly identical—both named after the physicist Evangelista Torricelli who invented the barometer.
For practical purposes: 1 Torr = 1 mmHg
Vacuum Technology
- Preferred in vacuum systems
- Scientific instrumentation
- Low-pressure measurements
Medical Applications
- Blood pressure readings
- Clinical measurements
- Healthcare standard
What pressure units are used in weather reports?
Weather services typically use hectopascals (hPa), millibars (mbar), or inches of mercury (inHg) depending on the region.
International Standard
United States
What is a Pascal?
The Pascal (Pa) is the SI (International System of Units) base unit of pressure, defined as one Newton per square meter (N/m²).
Named after mathematician and physicist Blaise Pascal, it's the fundamental unit used in this converter for all calculations.
Why larger units are common:
- 1 Pascal is quite small for practical measurements
- Kilopascals (kPa) = 1,000 Pa — common in engineering
- Megapascals (MPa) = 1,000,000 Pa — used for high pressures
- Gigapascals (GPa) = 1,000,000,000 Pa — material science applications
How accurate are the conversions?
Conversions use internationally recognized standard conversion factors with high precision calculations. For most engineering and scientific purposes, the results are accurate to many decimal places.
Use the precision selector to display the accuracy level you need:
- 2 decimals: Everyday applications and general use
- 4 decimals: Engineering and technical work
- 6-8 decimals: Scientific research and precision calculations
- Auto mode: Intelligent precision based on input value
Why are my settings saved?
The converter uses your browser's local storage to remember your preferences, including:
- Selected decimal precision
- Visible/hidden units
- Last used source unit
To reset all settings to defaults, clear your browser's local storage or site data for this domain.
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