Pressure Converter
Convert pressure between SI, metric, and common engineering units.
Converter guide
About Pressure Converter
The pressure converter changes a pressure value between common engineering units. Pressure is force per unit area, and the same physical pressure may be written in pascals, kilopascals, bar, atmospheres, or pounds per square inch depending on the field.
How to use this converter
- 1Enter the numeric pressure value. Use a negative value only if the context and selected unit convention permit it.
- 2Choose the source and target pressure units from the available lists.
- 3Read the converted value and compare it with the specification or instrument range you are using.
Conversion method and technical details
The converter maps the selected units through fixed conversion factors to a common base. Common relationships include 1 bar = 100,000 pascals, 1 atmosphere = 101,325 pascals, and 1 psi ≈ 6,894.757 pascals. Small display differences can occur from rounding.
Worked real-world example
A pressure of 2 bar is 200 kPa. It is approximately 29.01 psi, so a value can look different while describing the same pressure.
Common scenarios and use cases
Convert pressure specifications for pumps, tires, weather, hydraulics, or engineering calculations. Check whether a device expects absolute pressure or gauge pressure before comparing values.
For a dependable comparison, confirm both unit labels, keep the original measurement with the converted value, and use the precision required by the task. The converter changes the representation of a value; it does not measure the item or decide which standard your project requires.
Important details and limitations
Unit conversion does not distinguish gauge pressure from absolute pressure unless the input definition does. It also cannot validate a device rating or safe operating condition. Follow manufacturer instructions and use properly calibrated instruments.
Check the output unit as well as the number. If the result will be reused in another calculation, retain full precision where possible and round only at the end. For measurements governed by a technical specification, use the standard and tolerance required by that document.
Frequently asked questions
What is the difference between absolute and gauge pressure?
Gauge pressure is measured relative to local atmospheric pressure; absolute pressure is measured from a vacuum.
Is bar the same as atmosphere?
No. One bar is 100,000 Pa, while one standard atmosphere is 101,325 Pa.
Why does my gauge reading differ?
Calibration, temperature, measurement location, and gauge-versus-absolute reference can all matter.
Why can the converted number look much larger or smaller?
Different units use different scales. A measurement can have a larger number in a smaller unit and still describe the same quantity. Check the source and target unit labels before comparing values.
How many decimal places should I keep?
Keep enough precision for the job and avoid rounding values between steps. Round the final displayed answer to match the specification, document, or measuring tool you are using.