About this Pressure Converter
Pressure is the force applied perpendicular to the surface of an object per unit area. Different industries use different standards: mechanics use PSI for tires, divers use Bar or Atmospheres, and scientists use Pascals. This tool converts between them instantly.
Who this calculator is for
- Drivers, cyclists, and mechanics checking tire, compressor, or shop-pressure specs in different units.
- Divers, lab users, and engineering students comparing bar, atm, psi, and pascal values.
- Technicians reading manuals, gauges, or equipment labels sourced from different regions.
When to use it
- Use it when a tire placard, regulator, or compressor spec is shown in psi but your gauge reads bar, atm, or pascals.
- Use it to translate diving, gas, or lab-pressure readings between atmospheres, bar, and SI units.
- Use it before matching pressure-related values with temperature, torque, or HVAC planning tools.
How to use this calculator
- Enter the Pressure Value.
- Select the From unit (e.g., PSI).
- Select the To unit (e.g., Bar).
- Get the converted value.
Key assumptions
- Values are converted as scalar pressure magnitudes using standard reference factors relative to pascals.
- The tool does not distinguish between gauge, absolute, or differential pressure unless your source value already does.
- Displayed results do not account for temperature, altitude, or fluid-state changes that can matter in real systems.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
How this calculator works
Inputs explained
PSI
Pounds per Square Inch. Common in the US for tire pressure and industrial hydraulics.
Bar
Metric unit of pressure (though not SI), roughly equal to atmospheric pressure at sea level.
Pascal (Pa)
The SI derived unit of pressure used in physics and engineering. 1 Newton per square meter.
Understanding your results
Example scenarios
Tire Pressure
Convert 32 PSI to Bar. Result: ~2.2 Bar.
Scuba Diving
Convert 200 Bar to PSI. Result: ~2900 PSI.
Atmosphere
Convert 1 Atm to Pascal. Result: 101,325 Pa.
Key Features
- 4 Major Unit Systems
- High Precision
- Scientific Notation support
Tips & Best Practices
- For car tires, 1 Bar is roughly 14.5 PSI.
- 1 Bar equals 100,000 Pascals.
Glossary of Terms
- Atmosphere (atm)
- A unit of pressure equal to the average air pressure at sea level on Earth.
- Hydrostatic Pressure
- The pressure exerted by a fluid at equilibrium due to the force of gravity.