Pressure Converter

Convert between pascals, kilopascals, bar, atmospheres, PSI, mmHg, inHg, and torr instantly.

Common Pressure Conversions
FromToResult
1 atmPSI14.6959 psi
1 atmkPa101.325 kPa
1 atmbar1.01325 bar
1 barPSI14.5038 psi
1 barkPa100 kPa
1 PSIkPa6.89476 kPa
1 atmmmHg760 mmHg
1 MPabar10 bar

Frequently Asked Questions

Standard atmospheric pressure (1 atm) is defined as 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.6959 psi = 760 mmHg. This is the average air pressure at sea level. Actual atmospheric pressure varies with altitude, temperature, and weather conditions.

PSI (pounds per square inch) is used in the United States for tire pressure (typically 30–35 psi), blood pressure measurement, hydraulic systems, industrial equipment, and gas cylinders. Most of the world uses kPa or bar for these applications instead.

The Pascal (Pa) is the SI unit of pressure, defined as one newton per square meter (N/m²). It is named after mathematician Blaise Pascal. One pascal is a very small pressure — standard atmospheric pressure is about 101,325 Pa. Kilopascals (kPa) are more practical for most applications.

One bar = 100,000 Pa, while 1 atm = 101,325 Pa. 1 bar ≈ 0.9869 atm — very close but not equal. The bar is commonly used in meteorology, industrial processes, and European tire gauges. At standard conditions, a tire inflated to "1.5 bar gauge" has 2.5 bar absolute pressure (adding 1 atm ambient).

How It Works

Enter Pressure

Type the pressure value. All conversions use the pascal (Pa) as the SI base unit of pressure.

Select Units

Choose from metric, imperial, and scientific pressure units. Both absolute and gauge-referenced conversions are straightforward.

Read Result

Instant conversion with exact factor displayed. The reference table shows the most common pressure equivalents at a glance.

Common Use Cases

Tire Pressure

Convert tire pressure between PSI (US vehicles), kPa (international), and bar (European gauges) for vehicle maintenance and safety checks.

Medical & Blood Pressure

Convert blood pressure readings between mmHg (standard clinical units) and kPa or other units for international medical references.

Meteorology

Convert barometric pressure between hPa/mbar, inHg, and mmHg for weather forecasting and comparing international weather data.

Industrial Systems

Convert hydraulic and pneumatic system pressures between bar, PSI, and MPa for equipment specifications and international supplier comparisons.

Diving & Altitude

Convert water and atmospheric pressures for scuba diving depth calculations, altitude sickness thresholds, and aviation applications.

Physics & Chemistry

Convert pressures for gas law calculations, reaction conditions, and thermodynamic analysis in chemistry and physics coursework.

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