This pressure converter switches between pascals, bar, atm, psi, and mmHg.
Conversion
Pressure Conversion
Convert pascals, bar, atmospheres, psi and more.
Calculator
About this calculator
Formula notes
1 atm = 101325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg.
Worked examples
- Example: standard tire pressure 32 psi ≈ 2.21 bar ≈ 220.6 kPa.
- A tyre pressure of 35 psi is approximately 241.3 kPa or 2.413 bar.
How to use it
- Enter the pressure and its unit.
- Read all equivalent units at once.
- Use psi for tires and atm/bar for science.
Frequently asked questions
Is bar a metric unit?
Yes, it is 100 kPa exactly — close to, but not equal to, one atmosphere.
What does mmHg measure medically?
Blood pressure: 120/80 mmHg is the pressure that supports a mercury column that high.
Limits and interpretation
- Gauge pressure and absolute pressure use different zero references and cannot be interchanged without atmospheric pressure.
- Atmospheric pressure varies with weather and elevation, so a standard-atmosphere conversion is a defined reference, not a live reading.