⚙️ Pressure Converter - Pa, bar, PSI, atm

Pressure Unit Converter

This converter changes pressure values between the units used most often in science and engineering: the pascal (Pa), bar, pound per square inch (PSI), atmosphere (atm) and millimetres of mercury (mmHg). Pressure is defined as force spread over an area, and different fields favour different units, so being able to switch between them quickly is genuinely useful.

For reference, one standard atmosphere is about 101,325 pascals, roughly 1.013 bar, close to 14.7 PSI and 760 mmHg. The pascal is the SI unit, the bar is common in weather and industry, PSI is widely used for tyres and air systems, and mmHg appears in medical and laboratory contexts such as blood pressure.

How to use it

Enter a value, choose the unit you are starting from and the unit you want, and the converted result appears immediately with the correct scaling factors applied. It is well suited to engineering homework, physics problems, HVAC and fluid calculations, tyre and tank inflation, and any task where readings come in one unit but you need another. Double-check critical values against the gauge or instrument you are working with.