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Pressure Converter

Pascal, bar, PSI, atmospheres, mmHg

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-11
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What is Pressure Converter?

Eight pressure units, all anchored to the pascal, and the useful ones here are exact rather than nominal. A bar is defined as exactly 100 000 pascals, which is a deliberate piece of metric design that makes it easy to remember. Standard atmosphere is 101 325 pascals and pound-force per square inch is 6894.757293168, so one atmosphere comes to 14.6959 psi and a bar to 14.5038 psi — a difference that catches people out whenever a recipe in bar meets a gauge in psi. Torr and millimetres of mercury are offered as a single entry at 133.3224 pascals, which is the standard practice: the two are officially distinct but their difference is around nineteen millionths of a pascal, far below any gauge you will read. Weather, tyres and laboratory work are all covered; there is no megapascal.

Convert pressure between pascals, kilopascals, bar, PSI, atmospheres, torr and mmHg. Common for tires, engineering, weather and medical readings.

Private Pressure Converter In Your Browser

Pressure Converter is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use Pressure Converter

1

Enter the reading in the Value field, without a unit suffix.

2

Choose the scale your gauge or document uses from From unit.

3

Choose your target scale in To unit, or use the arrow to reverse the direction.

4

Check the All pressure units grid, where tapping any entry promotes it to the Result line.

Key Capabilities
  • Eight units covering the pascal, bar, atmosphere, PSI and torr families
  • Bar and atmosphere at their exact definitions of 100 000 and 101 325 pascals
  • Torr and millimetres of mercury combined into one correctly labelled entry
  • All eight pressure units converted live beneath the working fields
Common Use Cases
  • A mechanic converting a 2.2 bar tyre recommendation into psi for an American pump gauge.
  • A meteorologist translating a 1013 hPa surface pressure into inches-notation-friendly millibars.
  • A lab technician recording a vacuum reading in torr alongside readings taken in pascals.
Clear Answers

Frequently Asked Questions

Why is a bar not equal to an atmosphere?
Because the two were defined for different purposes. A bar is exactly 100 000 pascals, a clean number chosen for metric convenience. An atmosphere is 101 325 pascals, the pressure of a column of mercury supported by a standard atmosphere. The 1.3% gap is why 2.2 bar reads as 31.9 psi while 2.2 atmospheres would be 32.3.
Is torr the same as millimetres of mercury?
Not exactly, and the difference is vanishingly small. The conventional millimetre of mercury is 133.322387415 pascals and the torr is 133.322368421, a gap of about nineteen millionths of a pascal. This tool lists them together at 133.3224, which is what every lab manual effectively does.
There is no megapascal here — how do I get one?
Convert to kilopascals and divide by a thousand. 5 MPa is 5000 kPa, and if you need it in pascals that is 5 000 000 Pa. The list covers the units that turn up on gauges, packaging and lab instruments; the prefixed SI units are one multiplication away.
Can I convert altitude or depth?
Not directly. Both depend on the density of the medium as well as the pressure, so 1 bar is not a fixed number of metres of seawater or feet of air. The converter handles pressure alone, which is what instruments actually report.