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Pressure Unit Converter

Convert pressure measurements between metric and imperial units - Pascal, kilopascal, megapascal, bar, PSI and atmospheres.

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Result

Enter values above to calculate

These calculators provide estimates and educational results. Always verify critical engineering calculations against applicable standards and qualified professional review.

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What Is It

Pressure is expressed in different units across industries and regions: PSI dominates in the US (tire pressure, hydraulics, HVAC refrigerant), bar is common in Europe and industrial equipment, and Pascal (and kPa/MPa) is the SI standard used in most engineering calculations.

How to Calculate

Enter a value, select the unit you're converting from, and the unit you want to convert to. The result updates instantly using precise conversion factors.

Example

Converting 100 PSI to bar: 100 / 14.5038, about 6.89 bar. Converting 5 bar to kPa: 5 × 100 = 500 kPa.

Recommendations

When specifying pressure ratings for safety-critical equipment (pressure vessels, hydraulic systems), always double-check units on both sides of a conversion - a mixed-up PSI/bar reading is a common and potentially dangerous documentation error given both units are in everyday industrial use.

Frequently Asked Questions

Why is PSI still used if bar and Pascal are the SI standard?

PSI remains the default pressure unit for most US manufacturing, automotive and consumer equipment, so English-market datasheets, gauges and specifications are still predominantly labeled in PSI even as SI units dominate technical calculations elsewhere.

What's the difference between absolute and gauge pressure?

Gauge pressure is measured relative to atmospheric pressure (what most pressure gauges display), while absolute pressure includes atmospheric pressure in the total - this calculator converts pressure magnitude between units and does not change which reference point is being used.

How many PSI is one atmosphere?

One standard atmosphere equals approximately 14.696 PSI, 101.325 kPa, or 1.01325 bar - a useful reference point when sanity-checking pressure conversions.

Last reviewed: 2026-09-12