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Converters

Pressure Converter

Convert pressure between SI units, bars, standard atmospheres and pounds per square inch.

Conversion factors explained belowNo live data needed
Conversion workspace
Conversion workspace

Check the quantity, source unit and destination unit.

See the method

Choose units and a value

Runs on your device

Your converted value

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this converter

  1. Enter value, from, to.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

Input reference and sample values

Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.

InputFormat and unitsSample
ValueNumeric value. Zero or positive.1
FromChoose Pa / kPa / MPa / bar / mbar / atm / psi.bar
ToChoose Pa / kPa / MPa / bar / mbar / atm / psi.kPa

Result for these sample inputs

100 kPa
Conversion factor
100

Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.

The method, explained

Convert to the base unit, then divide by the target factor. One bar is 100,000 pascals. One standard atmosphere is exactly 101,325 pascals.

A WORKED EXAMPLE

1 bar = 100 kPa; 1 atm = 101.325 kPa.

What to keep in mind

The atmosphere is a standard unit, not a live local atmospheric reading. Gauge and absolute pressures use different zero references.

Common questions

Does this convert gauge pressure to absolute?

No. A reference atmospheric pressure must be added separately for that conversion.

Is bar the same as atmosphere?

No. One bar is slightly smaller than one standard atmosphere.

Methodology maintained by ClarityKit. How these tools are built and checked.