Pressure Converter

About the Pressure Converter

Our free Pressure Converter helps you convert between all common pressure units used in science, engineering, and everyday life. Whether you're working with tire pressures in psi, weather data in millibars, or scientific measurements in pascals, this calculator handles them all.

Pressure is the force applied per unit area and comes in many different units depending on the field of use. Engineers may work in psi or bar, meteorologists use millibars, and physicists work in pascals. This converter bridges all those worlds so you do not have to memorize conversion factors.

Simply enter a value, select the source and target units, and review the converted result. The converter supports Pascal, bar, psi, atmosphere, mmHg, and torr.

When This Page Helps

This converter keeps unit changes explicit, which is useful when checking calculations across engineering, weather, and tire-pressure contexts.

How to Use the Inputs

1. Select the pressure unit you are converting from in the "From" dropdown.
2. Select the desired output unit in the "To" dropdown.
3. Enter the pressure value you want to convert.
4. Read the converted result below the inputs.
5. Swap the From and To fields to reverse the conversion.

Example Calculation

Tips & Best Practices

• Tire pressure is usually measured in psi (US) or bar (Europe).
• Standard atmospheric pressure is 1 atm = 101.325 kPa = 14.696 psi.
• Blood pressure is measured in mmHg (millimeters of mercury).
• Torr and mmHg are nearly identical; 1 torr = 1 mmHg by definition.
• For deep-sea diving, every 10 meters of water adds roughly 1 atm of pressure.

Understanding Pressure Units

Pressure measurement is fundamental across science, medicine, engineering, and everyday life. From checking your tire pressure to monitoring blood pressure, understanding how to convert between units is essential.

Common Pressure Conversions

The most frequent conversions involve psi and bar for automotive applications, mmHg for medical measurements, and pascals for scientific work. Our converter handles all of these seamlessly, using precise conversion factors referenced to the SI unit pascal.

Applications of Pressure Measurement

Pressure plays a critical role in weather forecasting (barometric pressure), healthcare (blood pressure readings in mmHg), scuba diving (atmospheric pressure at depth), industrial processes (hydraulic systems in psi or bar), and aviation (cabin pressure in atm). This converter helps professionals and enthusiasts move between pressure units without reworking each conversion by hand.

Frequently Asked Questions

• What is the difference between bar and psi?

  Bar is a metric unit equal to 100,000 pascals, while psi (pounds per square inch) is an imperial unit. 1 bar is approximately 14.504 psi. Bar is commonly used in Europe and engineering, while psi is standard in the United States.

• How do I convert atm to psi?

  Multiply the atmosphere value by 14.696 to get psi. For example, 2 atm = 29.392 psi. This conversion is useful when working with pressurized systems or diving calculations.

• What is a pascal?

  A pascal (Pa) is the SI unit of pressure, defined as one newton per square meter. It is a very small unit, so kilopascals (kPa) and megapascals (MPa) are more commonly used in practice.

• Is mmHg the same as torr?

  They are essentially the same. Both equal 1/760 of a standard atmosphere. The torr is named after Evangelista Torricelli and is defined as exactly 101,325/760 pascals, which is nearly identical to 1 mmHg.

• What pressure unit is used for tires?

  In the United States, tire pressure is measured in psi. In Europe, bar or kPa are used. A typical car tire pressure is 30–35 psi, which is about 2.07–2.41 bar or 207–241 kPa.

• Why are there so many pressure units?

  Different fields developed their own units historically. Medicine uses mmHg, weather uses millibars, engineering uses psi or bar, and physics uses pascals. Each unit was convenient for the measurements common in that field.