Pressure Converter
Free online Pressure Converter to convert between PSI, bar, pascal, atmospheres, and more.
Share on Social Media:
The Pressure Converter instantly converts between PSI, bar, pascal, atmospheres, and more. From checking tire pressure to reading a weather barometer to sizing an engineering component, it gives you the exact figure in one click.
Why Pressure Has So Many Units
Different fields settled on different units. Drivers and mechanics use PSI or bar, scientists use pascals, weather reports use millibars or inches of mercury, and divers think in atmospheres. When a spec, gauge, or guide uses a unit you're not working in, conversion is the only way to act on it correctly — and with pressure, getting it right can matter for safety.
How to Convert
- Enter the pressure value.
- Choose the from and to units.
- Read the converted result instantly.
Key Pressure Equivalents
| Unit | Equals |
|---|---|
| 1 bar | ≈ 14.5 PSI = 100,000 Pa |
| 1 atmosphere | ≈ 14.7 PSI = 1.013 bar |
| 1 PSI | ≈ 6,895 Pa |
| 1 atm | 101,325 Pa |
The Everyday Case: Tire Pressure
This is where most people meet pressure conversion. A car's recommended pressure might be printed in PSI, while your pump reads in bar or kPa. Inflating to the wrong number affects grip, braking, tire wear, and fuel economy — and over- or under-inflation can be dangerous. Converting to match the manufacturer's spec keeps you safe and efficient.
Pressure Underwater
Diving makes pressure tangible: for roughly every 10 meters of seawater, pressure rises by about one atmosphere. At 30 meters a diver experiences around 4 atm of total pressure. Converting between atmospheres, bar, and depth is part of safe dive planning, which is why precise pressure conversion isn't only an engineering concern.
Who Uses a Pressure Converter
- Drivers and mechanics setting tire pressure correctly.
- Engineers working across PSI, bar, and pascals.
- Weather watchers reading barometric pressure.
- Divers planning by depth and atmospheres.
Accurate and Free
The converter uses precise factors at full precision, all in your browser. Convert as often as you need, free.
Frequently Asked Questions
How many PSI are in a bar?
One bar equals about 14.5 PSI. So a tire inflated to 2 bar is roughly 29 PSI. This conversion is handy because tire pressure is given in PSI in some countries and bar in others.
What is a pascal?
The pascal (Pa) is the SI unit of pressure, defined as one newton per square meter. It's a small unit, so pressures are often given in kilopascals (kPa) or megapascals (MPa). One bar equals 100,000 pascals.
What is one atmosphere of pressure?
One standard atmosphere (atm) is the average air pressure at sea level, equal to about 101,325 pascals, 1.013 bar, or 14.7 PSI. It's a useful reference point for weather and diving calculations.
Why is tire pressure important to convert?
Vehicles and pumps may display PSI, bar, or kPa depending on the region and equipment. Converting correctly ensures you inflate tires to the manufacturer's spec, which affects safety, handling, and fuel economy.
How does pressure relate to diving?
Underwater pressure increases by about one atmosphere for every 10 meters of seawater. Divers convert between atm, bar, and depth to plan dives safely, so accurate pressure conversion is more than academic.
What units does the converter support?
It handles PSI, bar, pascal and kilopascal, atmospheres, and other common pressure units, covering automotive, weather, engineering, and scientific needs in one tool.
Is the conversion accurate?
Yes. It applies precise factors at full precision, so results are reliable for engineering and safety-critical uses.
Is this tool free?
Yes — free, instant, and unlimited, with no signup.