Pressure Converter
Convert between Pascal, Bar, PSI, atm, Torr, mmHg and more pressure units instantly with precise results.
Convert Pressure Units
All Unit Conversions
How to Use the Pressure Converter
- Enter a Value — Type the numeric pressure value you want to convert into the input field. Decimals and negative values (for gauge pressure) are supported.
- Select the Source Unit — Choose the pressure unit you are converting from using the "From Unit" dropdown, such as PSI, Bar, or atm.
- Select the Target Unit — Choose the unit you want to convert to from the "To Unit" dropdown. You can pick any of the 10 supported units.
- Click Convert — Press the Convert button or hit Enter on your keyboard. The result appears instantly along with the conversion formula used.
- Copy or Swap — Use the Copy Result button to save the value, or click the swap button (⇄) to reverse the conversion direction instantly.
Key Features
10 Pressure Units
Convert between Pa, kPa, MPa, Bar, mbar, PSI, atm, Torr, mmHg, and kgf/cm² covering all common use cases.
Scientific Accuracy
Uses standardised conversion factors with up to 10 significant digits for engineering-grade precision.
All-Units View
See your value converted to every supported unit at once, making comparisons effortless.
Instant Swap
Reverse the source and target units with one click using the swap button for quick reverse conversions.
Responsive Design
Works flawlessly on desktops, tablets, and mobile phones with no installation or download required.
100% Private
All calculations run locally in your browser. No data is ever sent to a server or stored anywhere.
Pressure Conversion Formulas
The converter uses Pascal (Pa) as the base unit. Every input is first converted to Pascals, then from Pascals to the target unit. Below are the standard conversion factors:
| Unit | Symbol | 1 Unit = Pascals (Pa) |
|---|---|---|
| Pascal | Pa | 1 |
| Kilopascal | kPa | 1,000 |
| Megapascal | MPa | 1,000,000 |
| Bar | bar | 100,000 |
| Millibar | mbar | 100 |
| PSI | lb/in² | 6,894.757293168 |
| Atmosphere | atm | 101,325 |
| Torr | Torr | 133.32236842 |
| mmHg | mmHg | 133.322387415 |
| kgf/cm² | kgf/cm² | 98,066.5 |
Conversion Formula
Result = Input Value × (From Factor ÷ To Factor)
For example, to convert 14.696 PSI to atm: first convert to Pascals (14.696 × 6894.757293168 = 101,325.018 Pa), then convert Pascals to atm (101,325.018 ÷ 101,325 = 1.00000018 atm). This gives the familiar result that standard atmospheric pressure is approximately 14.696 PSI = 1 atm.
Practical Examples
Example 1: Tyre Pressure Check in India
A car owner in Chennai checks their tyre pressure gauge and reads 32 PSI. The vehicle manual specifies the recommended pressure in Bar. Using the converter: 32 PSI = 32 × 6894.757 ÷ 100,000 = 2.2063 Bar. This confirms the tyres are within the typical 2.0–2.4 Bar range for passenger cars in India.
Example 2: Industrial Boiler in Mumbai
A process engineer at a Mumbai manufacturing plant monitors a steam boiler operating at 10 Bar. Safety documentation requires the value in kPa and atm. Converting: 10 Bar = 1,000 kPa and 10 × 100,000 ÷ 101,325 = 9.8692 atm. These values go directly into the compliance report.
Example 3: Weather Reporting in London
A meteorologist in London records barometric pressure as 1013.25 mbar (standard atmosphere at sea level). For an international report requiring mmHg: 1013.25 × 100 ÷ 133.322387415 = 759.9998 mmHg, which rounds to the well-known value of 760 mmHg at standard conditions.
Example 4: HVAC System Design in Bengaluru
An HVAC engineer in Bengaluru specifies duct static pressure at 250 Pa. The equipment supplier quotes ratings in inches of water column (approximate: 1 inH₂O ≈ 249.089 Pa), but the purchase order uses kPa. Converting: 250 Pa = 0.25 kPa. This precise value ensures the correct fan is ordered for the air handling unit.
What Is Pressure and Why Convert It?
Pressure is defined as force applied per unit area. In the International System of Units (SI), its base unit is the Pascal (Pa), where 1 Pa equals 1 Newton of force distributed over 1 square metre. While the Pascal is the standard, numerous other units exist due to historical, regional, and industry-specific conventions.
In India, tyre shops commonly use PSI (pounds per square inch) or kgf/cm² (kilogram-force per square centimetre), while weather stations use millibars or hectopascals. Engineers work in Bar, kPa, or MPa depending on the industry. Medical equipment such as blood pressure monitors use mmHg (millimetres of mercury). This diversity makes a reliable pressure converter essential for students, engineers, mechanics, pilots, healthcare professionals, and anyone working across different measurement systems.
Understanding pressure conversions is also critical in YMYL (Your Money or Your Life) contexts — incorrect pressure readings in medical devices, aircraft systems, or industrial boilers can have serious safety consequences. This tool provides the accuracy needed for professional applications.
Want to learn more about pressure units, their history, and detailed conversion techniques?
Read Our Complete Guide to Pressure Conversion →Frequently Asked Questions
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