Convert Pressure Units
This tool converts between 7 common pressure units: pascal, kilopascal, bar, millibar, psi, atmosphere, and mmHg (torr).
| Unit | Value |
|---|
Common Pressure Conversion Formulas
Real-World Pressure Examples
2.21 bar
220.6 kPa
6.89 bar
689.5 kPa
0.158/0.107 atm
16.0/10.7 kPa
29.4 psi
2.03 bar
~0.333 atm
~4.89 psi
14.696 psi
29.921 inHg
Quick Reference Table
| Pa | kPa | bar | psi | atm | mmHg |
|---|---|---|---|---|---|
| 1 | 0.001 | 0.00001 | 0.000145 | 9.87×10⁻⁶ | 0.0075 |
| 1,000 | 1 | 0.01 | 0.145 | 0.00987 | 7.501 |
| 100,000 | 100 | 1 | 14.504 | 0.987 | 750.06 |
| 6,894.76 | 6.895 | 0.0689 | 1 | 0.0680 | 51.715 |
| 101,325 | 101.325 | 1.01325 | 14.696 | 1 | 760 |
| 133.322 | 0.133 | 0.00133 | 0.01934 | 0.00132 | 1 |
Pressure Units Explained
Pascal (Pa)
The pascal is the SI unit of pressure, defined as one newton per square meter (N/m²). Named after Blaise Pascal. Because one pascal is very small, kilopascals (kPa) are more common in everyday use. Standard atmospheric pressure is 101,325 Pa.
Bar
One bar equals exactly 100,000 pascals. It is close to one atmosphere (1 bar ≈ 0.987 atm), which makes it convenient for many practical applications. Common in Europe for tire pressure, industrial equipment, and weather reports (as millibar or hectopascal).
PSI (Pounds per Square Inch)
PSI measures force in pounds applied over one square inch. It is the standard pressure unit in the United States and United Kingdom for tire pressure, water systems, and compressed gas. One atmosphere is approximately 14.696 psi.
Atmosphere (atm)
One standard atmosphere is defined as 101,325 Pa. It represents the average air pressure at sea level. Commonly used in chemistry, diving, and aviation as a reference point.
mmHg (Torr)
Millimeters of mercury measure the height of a mercury column that the pressure can support. One standard atmosphere supports 760 mm of mercury. This unit is standard for blood pressure readings and vacuum measurements. For practical purposes, 1 mmHg = 1 torr.
Millibar (mbar)
One millibar equals 0.001 bar or 100 pascals. Identical to the hectopascal (hPa). Widely used in meteorology for barometric pressure. Standard sea-level pressure is 1013.25 mbar.
Inches of Mercury (inHg)
Measures pressure by the height of a mercury column in inches. Standard in US aviation and weather forecasting. Standard atmospheric pressure is 29.921 inHg.
Frequently Asked Questions
How do I convert bar to psi?
Multiply the bar value by 14.5038. For example, 2 bar × 14.5038 = 29.01 psi. Use the converter above for instant results with any value.
How do I convert psi to bar?
Divide the psi value by 14.5038, or multiply by 0.0689476. For example, 35 psi ÷ 14.5038 = 2.41 bar.
What is standard atmospheric pressure?
Standard atmospheric pressure is defined as 101,325 Pa = 1 atm = 1.01325 bar = 14.696 psi = 760 mmHg = 1013.25 mbar = 29.921 inHg. It represents average air pressure at sea level at 15°C.
What is the difference between bar and psi?
Bar is a metric unit (1 bar = 100,000 Pa), common in Europe. PSI (pounds per square inch) is an imperial unit used mainly in the US and UK. 1 bar ≈ 14.504 psi.
What is the difference between mmHg and torr?
For practical purposes, they are identical. Both equal approximately 133.322 Pa. The torr is defined as exactly 1/760 atm. The difference between mmHg and torr is negligible (less than 0.000015%).
What pressure unit is used for tire pressure?
In the US and UK: psi. In Europe and most other countries: bar or kPa. A typical car tire runs at 30–35 psi ≈ 2.1–2.4 bar ≈ 207–241 kPa.
What unit is blood pressure measured in?
Blood pressure is measured in mmHg (millimeters of mercury). A reading of 120/80 mmHg means systolic pressure is 120 mmHg and diastolic is 80 mmHg.
How do I convert atm to psi?
Multiply the atmosphere value by 14.696. For example, 2 atm × 14.696 = 29.39 psi.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are computed using standard formulas and should be verified for critical applications.
Related Tools
- World Clock -- See current time in multiple cities worldwide with real-time updates
- Cooking Conversion Calculator -- Convert cooking units, ingredient weights, and oven temperatures for recipes
- Ounces to Grams Converter -- Convert between ounces and grams with real-time conversion, presets, and
- Temperature Converter -- Convert between Celsius, Fahrenheit, and Kelvin
Related Tools
View all toolsCooking Measurement Converter
cooking measurement converter. Convert between teaspoons, tablespoons, cups, milliliters, liters, and fluid ounces
Liquid Measurement Converter
Convert between ml, liters, fluid ounces (US & UK), cups, pints, quarts, gallons, tablespoons, and teaspoons
Ounces to Grams Converter
Convert between ounces and grams with real-time conversion, presets, and reference table
Hectares to Acres
hectares to acres converter. Enter hectares to get acres instantly
Weight & Mass Converter
Convert between metric and imperial weight units
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Pressure Converter FAQ
How do I convert bar to psi?
Multiply the bar value by 14.5038. For example, 2 bar × 14.5038 = 29.01 psi.
How do I convert psi to bar?
Divide the psi value by 14.5038, or multiply by 0.0689476. For example, 35 psi ÷ 14.5038 = 2.41 bar.
What is standard atmospheric pressure?
Standard atmospheric pressure is defined as 101,325 Pa = 1 atm = 1.01325 bar = 14.696 psi = 760 mmHg = 1013.25 mbar = 29.921 inHg.
What is the difference between bar and psi?
Bar and psi are both units of pressure. Bar is a metric unit (1 bar = 100,000 pascals), commonly used in Europe for tire pressure and industrial applications. PSI (pounds per square inch) is an imperial unit used mainly in the US and UK. 1 bar equals approximately 14.504 psi.
What is the difference between mmHg and torr?
For practical purposes, mmHg and torr are interchangeable. 1 torr is defined as exactly 1/760 of a standard atmosphere, and 1 mmHg is the pressure exerted by a 1 mm column of mercury at 0°C under standard gravity. The difference is negligible (less than 0.000015%).
What pressure unit is used for tire pressure?
In the US and UK, tire pressure is measured in psi. In Europe and most other countries, bar or kPa is standard. A typical car tire runs at 30-35 psi, which is about 2.1-2.4 bar or 207-241 kPa.
What unit is blood pressure measured in?
Blood pressure is measured in millimeters of mercury (mmHg). A reading of 120/80 mmHg means the systolic pressure is 120 mmHg and the diastolic pressure is 80 mmHg.
How do I convert atm to psi?
Multiply the atmosphere value by 14.696. For example, 2 atm × 14.696 = 29.39 psi.