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Pressure Converter

Convert between pascals, bar, psi, atmospheres and more. Type once and every unit updates.

Every unit
Pa
Pascal
kPa
Kilopascal
bar
Bar
psi
Pounds / sq inch
atm
Atmosphere
Torr
Torr
mmHg
Millimetres of mercury
Decimal places4

How to convert pressure units

  1. Enter a value

    Type a pressure amount into the field next to the unit you already have.

  2. Read every unit

    The other units recalculate as you type, so pascal, bar, psi, atm, torr and mmHg all update at once.

  3. Tune precision

    Drag the decimal places slider to show more or fewer digits for each result.

  4. Copy a result

    Copy any single value, or copy the full breakdown of all units with one action.

Why use this tool

Every unit at once

One field per unit, all linked through a shared pascal base. Edit any one and the rest follow immediately.

Seven common units

Pascal, kilopascal, bar, pounds per square inch, atmosphere, torr and millimetres of mercury in a single view.

Vacuum and gauge friendly

Negative values are accepted for gauge and vacuum readings, so below-atmospheric pressures convert cleanly.

Readable big numbers

Very large or very small pascal figures switch to scientific notation so results stay legible.

Adjustable precision

Choose from zero to ten decimal places to match rough estimates or lab-grade figures.

Private by design

Every calculation runs on your device. Nothing you type is uploaded or stored anywhere.

About this tool

The pressure converter turns a single reading into every common pressure unit at the same time. Enter a number beside the unit you already have, whether that is pascal, kilopascal, bar, pounds per square inch, atmosphere, torr or millimetres of mercury, and each remaining field recalculates instantly.

Every unit is defined against one base, the pascal, which is the standard unit of pressure equal to one newton per square metre. One bar is exactly 100,000 pascals, one standard atmosphere is 101,325 pascals, and one pound per square inch is about 6,894.76 pascals. Because everything routes through that single base, conversions stay consistent no matter which field you type into.

Weather, diving, tyre inflation, vacuum work and engineering specs all favour different units, which is why a quick cross-unit view is handy. A tyre gauge reads psi, a barometer reads millibar or mmHg, and a lab vacuum chart reads torr. Negative inputs are supported for gauge and vacuum measurements, and unusually large or small pascal values fall back to scientific notation so the numbers remain easy to scan. You can also raise or lower the number of decimal places, which is useful when you want a rough figure for a tyre or a precise one for a scientific report, and every field respects that setting at once.

Need related tools? Try the energy converter, the power converter or the general unit converter for other measurement families.

Frequently asked questions

How do I convert psi to bar?
Type your value into the psi field. The bar field updates instantly. One psi equals about 0.0689476 bar, and one bar equals about 14.5038 psi.
What is the base unit used for conversion?
Every unit is defined relative to the pascal. Your input is first turned into pascals, then converted out to each of the other units, which keeps all results consistent.
Can I enter negative pressures?
Yes. Negative values are accepted so you can work with gauge and vacuum readings that sit below atmospheric pressure.
What is the difference between torr and mmHg?
They are almost identical. One torr is defined as one 760th of a standard atmosphere, while one millimetre of mercury is very slightly different, so results can differ in the far decimal places.
Why do some results show scientific notation?
Pascal figures can grow very large or very small. When a value would need too many digits, it is shown in scientific notation so it stays readable.
Is my data sent anywhere?
No. All conversions happen on your device as you type. Nothing is uploaded, saved or shared.

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