Pressure Converter
Convert pressure between pascals, kilopascals, bar, psi, atmospheres and torr, with 1 atm = 101.325 kPa and tyre-pressure examples.
Results
Result
You might also need
Educational estimates · not financial advice · free, no signup
Formula / how it works
1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.696 psi = 760 torr. 1 bar = 100,000 Pa. 1 psi ≈ 6,894.757 Pa. Convert through pascals.
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
Pressure is force per unit area, and different fields use different units. The pascal is the SI unit, kilopascals are common on weather and engineering sheets, bar is used for tyres and diving in many countries, psi is used in the United States, and torr and atmospheres appear in science and vacuum work. This converter changes a value between six pressure units by converting through pascals. It does not distinguish between gauge pressure, which is measured relative to the atmosphere, and absolute pressure, which is measured from vacuum. A tyre gauge reads gauge pressure, while a barometer reads absolute pressure.
When to use / who it helps
- You are comparing tyre pressures in psi and bar.
- You are reading a weather forecast with pressure in hPa or kPa.
- You are working on a science or engineering problem.
- You are checking diving or compressor specifications.
- You are reading a manual that uses another unit.
How to use
Steps
- Enter the pressure value.
- Choose the unit you are converting from.
- Choose the target unit.
- Read the result.
- Know whether your reading is gauge or absolute pressure.
- Round sensibly for the use.
How to interpret results
- 1 atm is about 14.7 psi.
- 1 bar is slightly less than 1 atm.
- 1 psi is about 6.895 kPa.
- 760 torr equals 1 atm.
- Gauge and absolute pressure differ by about one atmosphere.
Common mistakes & gotchas
- Confusing gauge with absolute pressure.
- Treating bar and atm as identical.
- Using kPa where psi is expected.
- Over-inflating a tyre because of a unit mix-up.
- Rounding too soon.
Worked example
Worked example — 1 atm and a 32 psi tyre
- 1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar.
- 1 atm = 14.696 psi, which the tool shows as 14.695949.
- 32 psi × 6.894757 = 220.63 kPa, which is about 2.21 bar.
- If 32 psi is a gauge reading, the absolute pressure adds about one atmosphere: 1 + 32 ÷ 14.696 ≈ 3.18 atm.
Result: 1 atm is about 14.696 psi, and 32 psi is about 220.6 kPa or 2.21 bar.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.696 psi = 760 torr. 1 bar = 100,000 Pa. 1 psi ≈ 6,894.757 Pa. Convert through pascals.
Frequently asked questions
How many psi are in an atmosphere?
About 14.696.
Is bar the same as atm?
No. 1 atm is 1.01325 bar.
How do I convert psi to kPa?
Multiply by 6.894757.
What is the difference between gauge and absolute pressure?
Gauge is relative to the atmosphere; absolute is relative to vacuum.
What is torr?
A unit equal to 1/760 of an atmosphere.
What tyre pressure should I use?
Follow the vehicle's placard or manual.