Pressure Converter

Convert Any Unit of Pressure

Our converter supports a wide range of pressure units used across science, industry, and everyday life, including:

• Metric / SI units: Pascal (Pa), Kilopascal (kPa), Megapascal (MPa), Bar, Millibar (mbar)
• Imperial / US customary: Pounds per Square Inch (PSI), Pounds per Square Foot (PSF)
• Scientific & atmospheric: Standard Atmosphere (atm), Torr, Millimeters of Mercury (mmHg), Inches of Mercury (inHg)
• Technical: Kilobar (kbar), Hectopascal (hPa), Gigapascal (GPa)

Whether you need to convert PSI to Bar for a tire pressure check, Pascal to ATM for a chemistry problem, or mmHg for a blood pressure reading, this tool has you covered.

Why Use a Pressure Converter?

Pressure is measured differently depending on the industry, country, and application. A mechanic checks tire pressure in PSI, a meteorologist reads atmospheric pressure in hPa or mbar, a doctor records blood pressure in mmHg, and an engineer works in pascals or bars. Switching between these units manually leaves too much room for error.

A reliable pressure converter helps you:

• Stay safe on the road—convert tire pressure between PSI and Bar to match your vehicle manual or gas station gauge.
• Understand weather reports—convert between hPa, mbar, and inHg used in different countries’ forecasts.
• Work confidently in science and engineering—convert between Pascal, bar, and ATM for lab reports, fluid dynamics, and mechanical design.
• Read medical data accurately — understand blood pressure values in mmHg and their equivalents in other units.

How Accurate Is This Converter?

Our converter uses precise, internationally recognized conversion factors. For example:

• 1 Bar = 100,000 Pascals (exact)
• 1 atm = 101,325 Pascal (exact, by international definition)
• 1 PSI = 6,894.757 Pascal
• 1 mmHg = 133.322 Pa
• 1 Torr = 133.322 pascals

Results are displayed to several decimal places to ensure accuracy for both everyday use and technical applications.

FAQs

Q: How do I convert PSI to Bar?

A: Multiply the PSI value by 0.0689476. For example, 30 PSI × 0.0689476 = 2.07 Bar. Our converter does this automatically — just enter your value, select “PSI” as the input unit, and “Bar” as the output.

Q: What is the difference between PSI and Bar?

A: Both PSI and Bar measure pressure, but they belong to different systems. PSI (Pounds per Square Inch) is used primarily in the United States for applications like tire pressure and hydraulic systems. Bar is a metric unit widely used in Europe and internationally in engineering, weather, and industrial contexts. 1 Bar equals approximately 14.5038 PSI.

Q: What is a Pascal, and when is it used?

A: The Pascal (Pa) is the SI (International System of Units) unit of pressure, defined as one Newton per square meter. It is widely used in science, engineering, and physics. Because one Pascal is a very small unit, you will often see it expressed as kilopascals (kPa) or megapascals (MPa) in practical applications.

Q: How do I convert Bar to PSI?

A: Multiply the Bar value by 14.5038. So 2.5 Bar × 14.5038 = 36.26 PSI. You can also use our converter above for instant results.

Q: What is the difference between ATM and Bar?

A: One standard atmosphere (atm) equals 1.01325 Bar. While both are close to average atmospheric pressure at sea level, they are not equal. ATM is used mainly in chemistry and physics, while Bar is preferred in meteorology and engineering.

Q: What is mmHg, and why is it used for blood pressure?

A: mmHg stands for millimeters of mercury. It measures the pressure required to push a column of mercury up by one millimeter. It has been used in medicine for centuries because early pressure gauges used mercury columns. Blood pressure is still reported in mmHg worldwide due to this long-standing convention, even though modern devices no longer use mercury.

Q: What units does the pressure converter support?

A: Our tool currently supports Pascal, Kilopascal, Megapascal, Gigapascal, Hectopascal, Bar, Millibar, Kilobar, PSI, PSF, Standard Atmosphere (atm), Torr, mmHg, and Inches of Mercury (inHg). More units may be added based on user feedback.

Q: Is this pressure converter free to use?

A: Yes — completely free, with no account required. Use it as many times as you like, on any device.

Q: Can I use this tool on my phone?

A: Absolutely. Our pressure converter is fully responsive and works on smartphones, tablets, and desktop computers.

Q: What is the standard atmospheric pressure?

A: Standard atmospheric pressure is defined as exactly 101,325 Pascal, which equals 1 atm, approximately 1.01325 Bar, 14.696 PSI, or 760 mmHg. This value represents the average air pressure at sea level and is used as a reference point in science and engineering.

Q: Why do my converted results show many decimal places?

A: To ensure precision, especially for technical, medical, or scientific use. If you need a rounded result, simply round to the number of decimal places appropriate for your task.