Pressure Converter
Convert between Pa, bar, PSI, atm, torr, and more
What is the Pressure Converter?
A pressure converter switches between units used to measure force per unit area, things like pascals, bar, PSI (pounds per square inch), atmospheres, torr, and mmHg. You'll run into these units in weather reports, car tire maintenance, scuba diving, medical equipment like blood pressure monitors, industrial machinery, and lab work. Different fields use different units, which is why a converter matters. CalciHub's pressure converter handles the full range of common units so you can translate between any two without digging through conversion tables.
How Does It Work?
Pressure conversion works on fixed multipliers between units, all tied back to the SI base unit: the pascal (Pa).
Formula:
Converted Pressure = Input Pressure × Conversion Factor
Common conversion factors:
1 atmosphere (atm) = 101,325 pascals
1 bar = 100,000 pascals
1 PSI = 6,894.76 pascals
1 mmHg = 133.322 pascals
Input Pressure: the value you're starting with
Conversion Factor: the ratio from one unit to another
How to Use CalciHub's Pressure Converter
1. Type your pressure value into the input field.
2. Select the starting unit (e.g., PSI, bar, atm, pascal).
3. Select the unit you want to convert to.
4. Read the converted value instantly.
Tip: If you're checking tire pressure, most car manuals use PSI or bar. Knowing both helps you use any gauge you have on hand.
A Quick Example
A cyclist needs to inflate their road bike tires to 7 bar (as listed on the tire sidewall), but their pump gauge reads in PSI. They need to know the target pressure in PSI.
Input: 7 bar
Converting to: PSI
7 × 14.5038 = 101.53 PSI
Output: approximately 101.5 PSI
Now the cyclist can inflate accurately without guessing or risking an underinflated tire that makes the ride sluggish, or an overinflated one that risks a blowout.
Frequently Asked Questions
The pascal (Pa) is the SI unit for pressure. In practice, scientists also use kilopascals (kPa) and megapascals (MPa) for more manageable numbers. Atmospheric pressure is often expressed in kilopascals for weather applications.
PSI stands for pounds per square inch. It's widely used in the US for tyre pressure, hydraulics, and industrial equipment. Most of the rest of the world uses bars or kilopascals for the same applications.
Blood pressure is measured in millimetres of mercury (mmHg). A reading of 120/80 mmHg means 120 mmHg systolic and 80 mmHg diastolic. You can convert these to other units, but mmHg remains the global medical standard.
Close, but not exactly. One atmosphere is 1.01325 bar. For most practical purposes they're treated as equivalent, but in precision science or engineering, the small difference matters.
Yes, completely free. No registration, no paywalls, and no limits on how often you use it.
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