Pressure Converter - PSI, Bar, Pascal, ATM

Understanding Pressure Conversion

Pressure conversion is essential in many fields—from checking tire pressure to understanding weather systems and industrial applications. Different industries and countries use different units, making conversions a daily necessity for engineers, mechanics, scientists, and even ordinary drivers.

PSI (pounds per square inch) is common in the US, while most of the world uses bar or Pascals. Understanding these conversions helps with international equipment, weather reporting, and scientific research.

Why Pressure Conversion Matters

Tire Pressure: Different countries recommend pressure in PSI or bar.
Weather: Atmospheric pressure is reported in millibars (US) or hectopascals (elsewhere).
Scuba Diving: Tank pressure is measured in PSI or bar.
Industrial: Manufacturing processes require precise pressure control.
Aviation: Altimeter settings use inches of mercury.

Conversion Formulas

1 PSI = 0.0689 Bar 1 Bar = 14.504 PSI 1 Bar = 100,000 Pascals 1 atm = 101,325 Pascals 1 atm = 14.696 PSI 1 atm = 1.01325 Bar 1 atm = 760 mmHg (Torr) 1 inHg = 33.86 hPa

Common Pressure Applications

Car Tires: Typically 30-35 PSI (2.1-2.4 bar)

Bicycle Tires: 80-120 PSI (5.5-8.3 bar)

Atmospheric Pressure: 14.7 PSI at sea level (1 atm)

Scuba Tanks: 3000 PSI (207 bar) standard

Weather (Low Pressure): Below 1000 mbar

Weather (High Pressure): Above 1020 mbar

Quick Reference Chart

30 PSI = 2.07 bar 32 PSI = 2.21 bar 35 PSI = 2.41 bar 100 kPa = 14.5 PSI 1 bar = 100 kPa 1 atm = 101.325 kPa

Personal Example

When I bought a European bike online, the tire pressure was listed as 2.5 bar. I had no idea what that meant in PSI until I converted it—turned out to be about 36 PSI, right in the normal range!