Pressure Converter

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   What’s great about our Pressure Converter

   Fast, accurate conversion of pressures that you can see and drag

   • Free
   • Converts pascals, kilopascals, bar, PSI, atmospheres and millimeters of mercury instantly
   • Synced sliders and type-in boxes
   • No sign-up
   • No ads
   • Works offline once loaded
   • No daily limit
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   Choose which units to show

   Use the unit names at the top to show or hide each card. Drag a name or a card’s title to rearrange them; your order is remembered in this browser, and Restore puts the original order back.

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   Drag a slider or type a value

   Move any slider, or type a number into its “Type Value” box, and every visible unit updates instantly. The sliders are logarithmic, so each step along a slider multiplies the value, and one slider covers very small to very large amounts.

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   Widen the range

   Turn on “Wider Range” to widen every slider’s range to cover more extreme values.

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What is Pressure?

Pressure is the force pushing on each unit of area, such as air in a tire or the weight of the atmosphere. Scientists use pascals, weather forecasts use bar and millibar, tires use PSI, and blood pressure is read in millimeters of mercury. This converter moves between them.

About Pascals (Pa)

The pascal is the SI unit of pressure, equal to one newton of force per square meter. It is a very small unit, so larger pressures are usually given in kPa or bar.

• 1 Pa = 1 N/m², and 1,000 Pa = 1 kPa
• A sheet of paper resting on a table presses with about 1 Pa
• Named after the French scientist Blaise Pascal

About Kilopascals (kPa)

A kilopascal is 1,000 pascals. Weather services, tire gauges and engineering specifications often use it.

• 1 kPa is about 0.145 PSI
• Standard atmospheric pressure is 101.325 kPa
• Tire pressures outside the US are often given in kPa, such as 220 kPa (about 32 PSI)

About Bar (bar)

The bar is a metric unit of pressure equal to exactly 100,000 pascals, close to atmospheric pressure at sea level.

• 1 bar = 100 kPa, or about 14.5 PSI
• Standard atmospheric pressure is 1.01325 bar
• Used for tires, diving tanks and weather maps (in millibars) in much of Europe

About PSI (PSI)

PSI (pounds per square inch) is the US customary unit of pressure: one pound-force pressing on one square inch. One PSI is about 6,894.757 pascals.

• 14.696 PSI = 1 atm
• Car tires are usually inflated to 30 to 35 PSI
• Road bike tires can need 80 to 130 PSI

About Atmospheres (atm)

A standard atmosphere is exactly 101,325 pascals, the average air pressure at sea level.

• 1 atm = 1.01325 bar = 14.696 PSI = 760 mmHg
• Used in chemistry for standard conditions
• At the top of Mount Everest the air pressure is about a third of sea level

About Millimeters of Mercury (mmHg)

A millimeter of mercury is the pressure at the base of a 1 mm column of mercury, about 133.322 pascals. It is still used for blood pressure and in some medical and weather settings.

• 760 mmHg = 1 atm
• Blood pressure is reported in mmHg, such as 120/80
• The torr is almost identical (1 torr = 1/760 atm)