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Precision Pressure Conversion

Pressure Unit Converter

Convert pressure measurements between pascals, kilopascals, bar, psi, atmospheres, torr, millimeters of mercury and other common units with fast and accurate results.

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17 Pressure Units
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Pressure Gauge Visual
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Pressure gauge illustration Professional pressure gauge showing pressure values with bar, psi and kilopascal units. 0 20 40 60 80 100 PRESSURE kPa IMPERIAL PSI METRIC bar STANDARD atm VACUUM torr
Pa SI Pressure Unit
bar Metric Pressure
psi Imperial Pressure

Convert Pressure Units Instantly

Enter a pressure value and select any two units. Your accurate converted result appears automatically.

Pressure Unit Converter Metric, imperial and atmospheric pressure
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0.001 kPa
1 Pa = 0.001 kPa
Quick values

Popular Pressure Conversions

Quickly load frequently used automotive, atmospheric and engineering pressure conversions.

Bar to PSI 1 bar ≈ 14.5038 psi
PSI to Bar 1 psi ≈ 0.0689476 bar
Atmosphere to kPa 1 atm = 101.325 kPa
MPa to PSI 1 MPa ≈ 145.038 psi
Torr to Pascal 1 torr ≈ 133.322 Pa
hPa to mbar 1 hPa = 1 mbar

Why Use Our Pressure Unit Converter?

Quickly compare pressure measurements used in engineering, automotive work, weather, HVAC, science and industrial systems.

Instant Conversion

Results update automatically when you type a pressure value or choose different units.

Precise Factors

The tool uses reliable conversion factors for metric, imperial and atmospheric pressure units.

17 Pressure Units

Convert Pa, kPa, MPa, bar, psi, atm, torr, mmHg, inHg, water-column units and more.

Free & Private

All calculations happen directly in your browser without registration or data upload.

What Is Pressure?

Pressure describes how much force is applied over a given area. It is important in fluid systems, gases, weather, vehicle tires, industrial equipment and many engineering applications.

The pascal (Pa) is the SI unit of pressure. Because one pascal is relatively small, kilopascals and megapascals are often more convenient for everyday engineering values.

What is PSI?

PSI means pounds-force per square inch. It is commonly used for tire pressure, compressed air, hydraulic systems and other applications that use imperial units.

What is Bar?

Bar is a metric pressure unit widely used in engineering and automotive applications. One bar is exactly equal to 100,000 pascals.

BASIC PRESSURE RELATIONSHIP
P = F ÷ A
Pressure equals the perpendicular force applied to a surface divided by the area over which the force acts.
P Pressure
F Applied Force
A Surface Area
1 Pa 1 N/m²
1 bar 100,000 Pa
1 atm 101,325 Pa

Common Pressure Units

Compare frequently used pressure units with their equivalent value in pascals.

Pressure Unit Symbol Equivalent in Pascals
Pascal Pa 1 Pa
Kilopascal kPa 1,000 Pa
Megapascal MPa 1,000,000 Pa
Bar bar 100,000 Pa
Pound per Square Inch psi ≈ 6,894.757 Pa
Standard Atmosphere atm 101,325 Pa
Torr torr ≈ 133.322 Pa
Millimeter of Mercury mmHg ≈ 133.322 Pa
Inch of Mercury inHg ≈ 3,386.389 Pa
Kilogram-force/cm² kgf/cm² 98,066.5 Pa

Where Are Pressure Conversions Used?

Pressure units appear across automotive, engineering, weather, HVAC, hydraulics and scientific applications.

Tire Pressure

Convert tire pressure specifications between psi, bar and kilopascals for cars, motorcycles and other vehicles.

Hydraulic Systems

Compare high-pressure hydraulic measurements using MPa, bar and psi across machinery and industrial equipment.

Weather & Atmosphere

Convert atmospheric pressure between hPa, millibars, atmospheres and mercury-based units.

HVAC & Refrigeration

Convert system and refrigerant pressure values when working with HVAC gauges and equipment.

Industrial Equipment

Compare compressor, pump, pipeline, boiler and process equipment pressure specifications.

Science & Laboratories

Convert pascals, torr, atmospheres and other pressure units used in physics and laboratory measurements.

How to Use the Pressure Unit Converter

Convert pressure measurements in three quick steps.

1

Enter Pressure

Type your pressure measurement into the converter's value field.

2

Select Units

Choose the pressure unit you have and the unit you want to convert it into.

3

Get the Result

Your converted pressure value and unit ratio appear instantly without reloading the page.

Pressure Unit Converter FAQs

Common questions about pascals, psi, bar, atmospheres and pressure conversion.

The SI unit of pressure is the pascal (Pa). One pascal equals one newton of force acting over one square meter of area.
One bar is approximately equal to 14.5038 pounds per square inch (psi).
One psi is approximately equal to 0.0689476 bar.
One standard atmosphere is exactly 101.325 kilopascals.
Yes. One hectopascal is numerically equal to one millibar. For example, 1013.25 hPa equals 1013.25 mbar.
Bar and psi both measure pressure but belong to different measurement systems. Bar is a metric unit, while psi represents pounds-force per square inch.
Yes. Select megapascal (MPa) as the source unit and psi as the target unit. One MPa is approximately equal to 145.038 psi.
Yes. This Pressure Unit Converter is free to use and performs all calculations directly in your browser without requiring registration.