How Pressure Converter Works
The pascal is the SI base unit for pressure — one newton of force per square meter. A standard atmosphere is defined as exactly 101,325 pascals, and one PSI (pound per square inch) equals about 6,894.76 pascals, so your input is multiplied by its own factor to reach pascals, then divided by each other unit's factor to fill in the rest of the table.
How to Use This Tool
- Enter the pressure value you want to convert.
- Choose the unit it's currently measured in, from pascals to torr.
- The results box shows that pressure converted into every other unit, updating live.
- Select Reset to clear the field and start over.
Example
Standard atmospheric pressure, 1 atmosphere, equals 101,325 pascals and 101.325 kilopascals (101,325 ÷ 1,000), which works out to about 14.696 PSI (101,325 ÷ 6,894.76).
Helpful Tips
- Tire pressure is usually specified in PSI in the US and bar or kPa elsewhere — check your vehicle's manual to see which one applies before inflating.
- Weather reports commonly use hectopascals (equal to hPa = 100 Pa, close to millibars) or inches of mercury, both of which relate directly to the pascal and torr units used here.
Frequently Asked Questions
What's the difference between bar and atmosphere?
They're very close but not identical: 1 bar equals exactly 100,000 pascals, while 1 standard atmosphere equals 101,325 pascals — so 1 atm is about 1.3% higher than 1 bar.
Why is PSI still common if pascal is the standard unit?
PSI (pounds per square inch) remains the everyday unit in the US for tire pressure, plumbing and mechanical specifications, even though the pascal is the internationally standardized SI unit used in most scientific and engineering contexts.
What is torr used for?
Torr, roughly equal to the pressure of 1 millimeter of mercury, is commonly used in vacuum technology, chemistry and medicine (such as blood pressure readings), where very precise low-pressure measurements matter.
Can pressure be a negative number?
Absolute pressure can't go below zero, but gauge pressure (measured relative to atmospheric pressure) can be negative, representing a partial vacuum — this converter treats whatever number you enter as a straightforward magnitude.
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