🌬️ Free Pressure Converter

What is this tool?

The Pressure Converter is a free online tool for converting pressure between pascals (Pa), kilopascals (kPa), bar, pounds per square inch (psi), and atmospheres (atm). It is useful for tire pressure checks, weather and barometric readings, scuba diving, HVAC and engineering work, and science experiments. The tool runs entirely in your browser, keeping your numbers private and instant.

How it works

The converter uses the pascal as the base unit: 1 kPa = 1000 Pa, 1 bar = 100,000 Pa, 1 psi = 6894.757293168 Pa, and 1 atm = 101,325 Pa. Your input is converted to pascals first and then to the target unit, giving exact results for any pairing of units.

How to use

1. Enter the pressure value you want to convert.
2. Select the input unit (Pa, kPa, bar, psi, or atm) from the first dropdown.
3. Select the target unit from the second dropdown and click Convert.
4. Read the converted pressure instantly with the calculation summary below.

Frequently Asked Questions

What tire pressure should I use?

Check your vehicle manual or the sticker inside the driver’s door — typical car tires run around 30–35 psi (2.1–2.4 bar). This converter lets you compare pressures in any unit.

What is standard atmospheric pressure?

Standard atmospheric pressure at sea level is 1 atm, equal to 101,325 Pa, 1.01325 bar, or 14.6959 psi. It is the baseline used in weather and engineering.

Is this pressure converter accurate?

Yes. It uses the exact definitions of the pascal, bar, psi, and atmosphere, so results are precise for automotive, weather, and professional use.

Tips & Advice

For tire pressure, remember that 1 bar ≈ 14.5 psi, so 2.3 bar ≈ 33 psi. In weather reports, sea-level pressure is about 1013 hPa (hectopascals), which equals 1013 mbar or 1 atm.