Pressure Converter

Pressure is force spread over an area, and different fields have settled on different preferred units to express it. Meteorologists often use hectopascals or inches of mercury, engineers frequently use psi or bar, scientists tend to use pascals or atmospheres, and some industrial gauges are marked in kilograms-force per square centimeter. All of these describe the same underlying physical quantity, so they can be converted precisely using fixed numeric factors relative to the pascal, the SI base unit for pressure.

To use the converter, pick the unit your value is currently in from the "from" list, choose the unit you want it expressed in from the "to" list, and type your number into the input field. The converted figure updates live as you type, so you can adjust the value and watch the result change instantly. A swap button lets you reverse the two selected units in one click, and an all-units table below shows your entered value converted into every supported pressure unit simultaneously, which is useful when you need to compare a specification against several different unit systems at once. You can also adjust the displayed precision if you need more or fewer decimal places for your purposes.

Say a tire gauge reads 32 psi and you need that figure in bar for a manual written using metric units. Multiply 32 by the psi-to-pascal factor, 6.894757293168, to get 220,632.23 Pa, then divide by 100,000 to convert pascals to bar, giving approximately 2.21 bar.

Using the converter directly, you would set "from" to psi and "to" to bar, then type 32. The live result shows roughly 2.21 bar immediately, without you needing to do the intermediate pascal step yourself, and the all-units row also displays the same pressure in atmospheres (about 0.218 atm) and kilopascals (about 220.63 kPa) at the same time.