Converter

Pressure Converter

Convert between PSI, bar, atm, Pascal, kPa, mmHg, torr, and inHg instantly. Ideal for tire pressure, HVAC, weather, and engineering calculations.

Quick Answer

1 atm = 14.696 PSI = 1.013 bar = 101.325 kPa = 760 mmHg = 29.92 inHg. Select units below to convert any pressure value between 8 common units.

Convert Pressure

Enter a value and select units to convert.

1 Standard Atmosphere
14.695949 PSI

All Equivalents

UnitValue
Pascal (Pa)101,325
Kilopascal (kPa)101.325
Pounds per Sq Inch (PSI)14.695949
Bar (bar)1.01325
Standard Atmosphere (atm)1
Millimeters of Mercury (mmHg)760.0021
Torr (Torr)760.0021
Inches of Mercury (inHg)29.921244

Pressure References

ReferencePSIbarkPa
Vacuum (outer space)
~0 Pa		000
Standard atmosphere
Sea level		14.6959491.01325101.325
Car tire (recommended)
~32 PSI		31.9999682.20632220.632
Bicycle tire (road)
~100 PSI		1006.89476689.476
Scuba tank
~3,000 PSI		2,999.9607206.8420,684
Hydraulic press
~10,000 PSI		10,000.0004689.475768,947.573

About This Tool

The Pressure Converter provides instant conversions between eight commonly used pressure units. From tire pressure and blood pressure to weather barometers and industrial hydraulics, pressure measurements appear across many fields. This tool displays all equivalents simultaneously so you never need to run multiple conversions.

Understanding Pressure Units

The Pascal (Pa) is the SI unit of pressure, defined as one newton per square meter. Because the Pascal is very small, kilopascals (kPa) and bars are more commonly used in engineering. PSI (pounds per square inch) dominates in the United States for tire pressure, gas systems, and industrial applications. Atmospheres (atm) and millimeters of mercury (mmHg) are used in chemistry and medicine respectively.

Tire Pressure Conversion

European and Asian vehicles often specify tire pressure in bar or kPa, while American vehicles use PSI. A typical passenger car tire pressure of 32 PSI equals about 2.2 bar or 220 kPa. Under-inflated tires waste fuel and wear unevenly, while over-inflated tires reduce traction. Always convert to your gauge's units before inflating.

Barometric Pressure and Weather

Weather stations measure atmospheric pressure to predict weather changes. Rising pressure generally indicates fair weather, while falling pressure suggests incoming storms. Standard atmospheric pressure at sea level is 101.325 kPa, 1013.25 hPa (hectopascals), or 29.92 inHg. Pressure decreases with altitude at roughly 12 hPa per 100 meters near sea level.

Frequently Asked Questions

How do I convert PSI to bar?
Divide PSI by 14.5038 to get bar. For example, 30 PSI = 30 / 14.5038 = 2.069 bar. For a quick estimate, divide PSI by 14.5. Conversely, multiply bar by 14.5038 to get PSI. This conversion is commonly needed when working with European and Asian tire pressure specifications, which use bar, vs American specifications, which use PSI.
What is the difference between mmHg and torr?
For all practical purposes, mmHg and torr are identical. One torr is defined as exactly 1/760 of a standard atmosphere, which equals 133.322 Pa. One mmHg (millimeter of mercury) is the pressure exerted by a 1 mm column of mercury, which also equals approximately 133.322 Pa. The difference is less than 0.000015% and is negligible in all but the most precise scientific measurements.
What is standard atmospheric pressure?
Standard atmospheric pressure (1 atm) is defined as exactly 101,325 Pa (101.325 kPa). This equals 14.696 PSI, 1.01325 bar, 760 mmHg, 760 Torr, or 29.921 inHg. It represents the average air pressure at sea level and is used as a reference point in science, engineering, and weather reporting. Actual atmospheric pressure varies with weather, altitude, and temperature.
Why is blood pressure measured in mmHg?
Blood pressure is measured in millimeters of mercury (mmHg) because the original sphygmomanometers used a column of mercury to measure pressure. A normal blood pressure reading of 120/80 mmHg means the systolic pressure pushes a mercury column to 120 mm and the diastolic to 80 mm. Despite modern digital monitors, the mmHg unit persists as the medical standard worldwide.
What pressure units do weather forecasters use?
Weather forecasters use different units depending on the country. In the US, barometric pressure is reported in inches of mercury (inHg), with standard pressure at 29.92 inHg. Most other countries use hectopascals (hPa) or millibars (mbar), which are numerically identical — standard pressure is 1013.25 hPa. Low pressure systems (storms) typically show readings below 1000 hPa (29.53 inHg), while high pressure systems exceed 1020 hPa (30.12 inHg).

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