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Free Pressure Converter – Convert PSI, Bar & kPa

Convert between pascals, bar, PSI, atmospheres and mmHg.

Pressure Converter What is this? ↓
About the Pressure Converter

What is the Pressure Converter?

A pressure converter changes a pressure reading between pascals, bar, pounds per square inch, atmospheres and mercury units.

Why use this calculator?

Tyre inflation, weather reports, diving and engineering each use different pressure units, so a converter helps avoid dangerous errors.

How to use it

  1. Enter the pressure value.
  2. Choose the source and target units.
  3. Read the converted pressure.

Formula

One standard atmosphere equals 101,325 pascals, or about 14.696 PSI.
PSI means pounds-force per square inch, common in the US for tyre and equipment pressures.
Frequently Asked Questions
How many PSI is one bar?
One bar is about 14.504 PSI.
What is a standard atmosphere?
It is 101,325 pascals, the average sea-level atmospheric pressure used as a reference.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.

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