How to Use This Tool
Enter a Value
Type the pressure you want to convert into the input field. Decimals and scientific notation are supported.
Choose Your Units
Pick a From unit and a To unit from the dropdowns. Use the swap button to flip them instantly.
Read the Result
The converted value appears instantly below the inputs. Click Copy to put it on your clipboard.
See All Conversions
Scroll down to see the same pressure converted into every other supported unit at once.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser with no server costs.
Is my data sent to a server?
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No. All conversion math happens directly in your browser. Nothing you type is ever sent anywhere.
What units are supported?
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10 units: Pascal (Pa), Kilopascal (kPa), Megapascal (MPa), Bar, Millibar, Atmosphere (atm), PSI (pounds per square inch), Torr (mmHg), Inches of Mercury (inHg), and Centimeters of Water (cmH2O).
What is PSI?
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PSI stands for pounds per square inch. It is the most common pressure unit in the United States, used for tire pressure, water systems, and industrial equipment.
What is an Atmosphere?
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One atmosphere (atm) is the average air pressure at sea level, equal to 101,325 Pascals or about 14.696 PSI. It is used as a reference point in science and diving.
What is a Torr?
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One Torr is approximately equal to one millimeter of mercury (mmHg). It is commonly used in vacuum science, blood pressure readings, and weather.
What is the difference between Bar and Millibar?
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1 bar = 1,000 millibar. Bar is close to 1 atmosphere (1 bar = 100,000 Pa, 1 atm = 101,325 Pa). Millibar is commonly used in weather forecasting.
How accurate are the conversions?
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The tool uses standard conversion factors and displays up to 10 significant figures. Results are accurate for everyday, educational, and professional use.
Can I see all conversions at once?
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Yes. Below the main result, the tool shows the same value converted into every other unit in a scrollable list.
Does it support decimals?
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Yes. You can type values like 0.5, 14.7, or 1.013e5. The tool handles all standard number formats.
What Is Pressure Converter?
Pressure Converter is a free tool that converts between 10 pressure units right in your browser. It covers scientific units (Pascal, Kilopascal, Megapascal), industrial units (Bar, PSI), atmospheric references (atm, Millibar), and traditional units (Torr, Inches of Mercury, Centimeters of Water). Nothing you type is ever sent anywhere - all math runs locally on your device.
The result updates live as you type, and a full conversion table shows the same value in every other unit at once. Use the swap button to flip your units instantly, or copy the result to your clipboard in one click.
Features Explained
10 Pressure Units
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Convert between Pascal, Kilopascal, Megapascal, Bar, Millibar, Atmosphere, PSI, Torr, Inches of Mercury, and Centimeters of Water.
Pascal Family
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Pascal (Pa) is the standard unit of pressure in science. Kilopascal (kPa) and Megapascal (MPa) scale it up for practical engineering and tire pressure ratings.
Bar and Millibar
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Bar is widely used in industrial settings and is very close to 1 atmosphere. Millibar is used in weather forecasting to describe atmospheric pressure changes.
PSI for Everyday Use
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Pounds per square inch is the go-to pressure unit in the United States for tire pressure, water pressure, compressed air, and most consumer-facing applications.
Atmosphere as a Reference
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One atmosphere is the average air pressure at sea level. It serves as a convenient reference in science, diving, and altitude calculations.
Torr and Mercury Units
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Torr (equivalent to millimeters of mercury) and Inches of Mercury are traditional units still used in blood pressure readings, vacuum science, and weather.
Instant Conversion
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The result updates live as you type. There is no Convert button to click - you see the answer the moment your input changes.
All Conversions at Once
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Below the main result, a scrollable table shows the same pressure converted into every other unit simultaneously.
Swap Button and Copy
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Click the swap button to flip From and To instantly. Click Copy to put the result on your clipboard, ready to paste anywhere.
100% Browser-Based
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All conversion math runs directly in your browser. Nothing you type is ever sent to any server - complete privacy.
Who Is This Tool For?
Mechanical Engineers
Convert pressure specifications between Pascal, Bar, PSI, and Megapascal for hydraulic systems, piping, and material stress calculations.
HVAC Technicians
Convert refrigerant pressures and system readings between PSI, Bar, and kPa for installation, diagnosis, and maintenance.
Automotive Mechanics
Convert tire pressure, fuel system pressure, and turbo boost readings between PSI, Bar, and kPa.
Drivers
Convert tire pressure recommendations between PSI, Bar, and kPa when your tire, gauge, or manual uses a different unit.
Divers
Convert dive depth pressures between atmospheres, Bar, and PSI for dive planning and equipment specifications.
Pilots
Convert altimeter settings and cabin pressures between inches of mercury, millibar, and hectopascal for flight planning.
Weather Enthusiasts
Convert barometric pressure readings between millibar, inches of mercury, and atmospheres from different weather sources.
Scientists
Convert between Pascal, atmosphere, and Torr for laboratory experiments, vacuum systems, and research publications.
Medical Professionals
Convert blood pressure and respiratory readings between mmHg (Torr), kPa, and cmH2O for clinical documentation.
Students
Convert pressure units for physics, chemistry, and engineering homework. Pascal, atmosphere, and Torr appear frequently in textbooks.
Teachers
Demonstrate pressure conversions in real time during lessons and help students understand different pressure scales.
Industrial Workers
Convert compressed air, steam, and process pressures between Bar, PSI, and kPa for equipment setup and safety checks.
Plumbers
Convert water pressure readings between PSI, kPa, and Bar for residential and commercial plumbing systems.
Oil and Gas Workers
Convert wellhead, pipeline, and reservoir pressures between PSI, Bar, MPa, and atmosphere for operations and reporting.
Bicycle Enthusiasts
Convert tire pressure between PSI, Bar, and kPa when following recommendations from different pump gauges or tire brands.
Brewers
Convert carbonation and keg pressures between PSI, Bar, and kPa for consistent brewing results.
Vacuum Technicians
Convert vacuum levels between Torr, millibar, Pascal, and inches of mercury for pump specification and process control.
Aerospace Engineers
Convert cabin, fuel, and structural pressures between PSI, kPa, atm, and Megapascal for aircraft and spacecraft design.
Firefighters
Convert hose and hydrant pressures between PSI, Bar, and kPa for equipment checks and incident response.
Aquarium Hobbyists
Convert CO2 regulator pressures between PSI, Bar, and kPa for planted tank setups.
Scuba Instructors
Convert tank and regulator pressures between PSI, Bar, and atmosphere for student training and equipment checks.
Construction Workers
Convert concrete testing and pneumatic tool pressures between PSI, kPa, and MPa.
Researchers
Convert experimental pressure data between SI and traditional units for cross-referencing and publications.
Anyone
Quickly convert any pressure for any reason - tires, weather, diving, science, or work.
Tips for Best Results
Common pressure reference
Standard atmospheric pressure at sea level is 1 atm = 101,325 Pa = 101.325 kPa = 1.01325 Bar = 14.696 PSI = 760 Torr = 29.92 inHg.
Tire pressure
Car tires are usually 30 to 35 PSI (about 2.07 to 2.41 Bar or 207 to 241 kPa). Bicycle tires can range from 40 to 130 PSI depending on the type.
Bar is close to atm
1 Bar = 100,000 Pa, while 1 atm = 101,325 Pa. They are close but not identical, so use the right one for your context.
Torr equals mmHg
1 Torr is defined as exactly 1/760 of an atmosphere and is very nearly equal to 1 millimeter of mercury. Blood pressure is typically measured in mmHg (Torr).
Use the All Conversions table
Scroll below the main result to see the same pressure in every other unit at once. This is the fastest way to compare across scales.
Use the swap button
Click the swap button between the dropdowns to flip From and To instantly instead of changing both dropdowns manually.
Copy the result in one click
Click Copy next to the result to put the value on your clipboard, ready to paste into a document, report, or message.
Megapascal for high pressures
Use MPa for very high pressures like hydraulic systems, structural testing, and material specifications. 1 MPa = 1,000 kPa = 145 PSI.
Scientific notation for extremes
For very high or very low pressures, type scientific notation like 1.013e5 (for 101,300 Pa) instead of counting zeros.
Privacy is built in
Nothing you type is ever sent to any server. All math runs in your browser, so your measurements stay completely private.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
If a tool saves your work on your own device, you can remove it at any time using the Clear All button. Some tools rely on an external service to return their result; in those cases, only the minimum data required for the request is sent, and never your files or content. Any ads shown on this page run in an isolated frame and cannot read, touch, or transmit anything you upload, paste, type, or download here. Advertisers may see standard visit information like your IP address and which page you're on, as described in our Privacy Policy, but your data itself stays fully under your control.
