Pressure Converter
Convert PSI, pascals, bars, atmospheres, kilopascals, Torr and other pressure units in seconds. Enter a pressure in either field, choose your measurement units and get the result with a formula and reference table.
Convert Pressure Instantly
Edit either number, change the units or choose a popular conversion shortcut.
1 psi equals 0.0689475729317 bar
Popular pressure conversions
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How to Use the Pressure Converter
Pressure describes force applied over an area. You might encounter it in tire and equipment specifications, weather reports, laboratory readings or engineering data. This converter translates the numerical measurement between different pressure units; it does not determine whether a pressure is appropriate for a particular application.
Enter your value
Type a pressure into the From field. You can also edit the To field to reverse the calculation.
Select the units
Choose pascals, psi, bar, Torr or another unit. The Swap button reverses the direction.
Read the result
See the converted value, conversion factor and a table that follows the selected units.
Pressure Conversion Formula
This calculator uses the pascal (Pa) as a common reference. It multiplies your input by the number of pascals in the source unit, then divides by the number of pascals in the destination unit.
General conversion formula
Converted pressure = Input × (Pa per source unit ÷ Pa per destination unit)
Example: Convert 30 psi to bar
One pound-force per square inch is approximately 6,894.757293 Pa. Therefore, 30 psi is approximately 2.068427188 bar.
Example: Convert 2 atmospheres to kilopascals
One standard atmosphere is exactly 101,325 Pa. Therefore, 2 atm equals 202.65 kPa.
The worked example updates with the selected units: 5 psi × 0.0689475729317 ≈ 0.344737864658 bar.
Gauge versus absolute pressure: The same conversion factor applies to either pressure scale. A negative gauge reading can be valid, but a negative absolute pressure is not physically meaningful. This converter does not automatically change gauge readings into absolute readings.
Pressure Conversion Table
The conversion chart updates as you change either dropdown. Each row uses the selected source and destination units.
| Pounds per square inch (psi) | Bars (bar) |
|---|---|
| 1 | 0.0689475729317 |
| 2 | 0.137895145863 |
| 5 | 0.344737864658 |
| 10 | 0.689475729317 |
Numbers are rounded for display. Use the appropriate significant figures and calibration standards when precision is important.
Pressure Units Explained
The pascal is the SI pressure unit: one newton of force spread over one square meter. This calculator supports common metric and customary pressure units, including MPa, conventional mmHg and conventional inHg.
Why the kilogram-force label matters
Some converters shorten these units to “kilograms per square centimeter” or “kilograms per square meter.” For pressure, the intended unit is kilogram-force (kgf), not kilogram mass. One kgf equals 9.80665 newtons at standard gravity, so 1 kgf/cm² equals 98,066.5 Pa and 1 kgf/m² equals 9.80665 Pa.
Are Torr and mmHg the same?
They are very close and often treated as interchangeable in rounded reference tables, but definitions can differ slightly. This calculator uses the exact Torr relationship of 1 atm / 760 and a separate conventional value for mmHg. Always check the required reference convention for sensitive measurements.
Frequently Asked Questions
How many pascals are in one bar?
Exactly 100,000 pascals equal one bar. One millibar is 100 Pa, and one hectopascal is also 100 Pa.
How do I convert PSI to bar?
Multiply the pressure in psi by approximately 0.06894757293. For example, 30 psi is about 2.06843 bar.
How many kilopascals are in one atmosphere?
One standard atmosphere is exactly 101.325 kPa. This is a defined reference value, not the pressure measured at every location.
Are hPa and millibars equal?
Yes. One hPa equals exactly one mbar. Both equal 100 pascals.
What is one kilogram per square centimeter in bar?
For pressure, the term normally means one kilogram-force per square centimeter (kgf/cm²), which equals exactly 0.980665 bar.
What does pounds per square foot mean?
It usually means pound-force per square foot, abbreviated lbf/ft² or psf. One psi equals exactly 144 lbf/ft².
Is mmHg exactly equal to Torr?
Not under every definition. Torr is exactly 1/760 of one standard atmosphere. The calculator uses a separate conventional mmHg factor.
Can I enter negative pressure?
Yes. Negative values can represent gauge pressure relative to a chosen reference. They do not represent negative absolute pressure, and the calculator does not change between those two reference systems.
Can I convert pressure into force?
Not without knowing the area. Pressure equals force divided by area, so converting pressure into a total force requires an additional area measurement.
Are the displayed results exact?
Some unit factors are defined exactly, while conventional values such as mercury columns use standards. The displayed decimal may also be rounded. Check the governing measurement convention for high-precision work.
Related Conversion Calculators
Use these tools when your measurement involves a different kind of physical quantity.
Conversion References
Pressure unit definitions are based on NIST references, including the Pressure and Gas Flow Unit Conversions and the Guide to SI, Appendix B.9.
Measurement note: A unit conversion is not an equipment operating recommendation. Always use suitable instrument readings, manufacturer documentation and applicable professional standards for technical decisions.