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Guides · How to Check Tire Pressure

PSI vs kPa vs Bar

These units measure the same pressure. Convert carefully and stay with the unit printed on your label.

Short answer

PSI, kPa, and bar are different scales for the same physical pressure. Convert the gauge to the unit printed on the door label. Do not treat 240 kPa as 240 PSI, and do not treat 2.4 bar as 24 PSI.

U.S. labels are usually PSI. Many imported cars and European pumps use bar or kPa. Digital gauges hide a unit button in a menu. That button is how people double or starve a tire.

The converter page exists so you can keep the recommended pressure the same while you change the scale. After conversion you still measure and you still inspect damage.

If two tools disagree by a huge amount, check units before you check for a leak.

Step-by-step

  1. 1Read the unit on the vehicle label.
  2. 2Read the unit on the gauge or pump.
  3. 3Convert so both sides match.
  4. 4Adjust air using the converted target.
  5. 5Recheck with the same tool.

Common mistakes

Mixing 2.4 bar with 24 PSI Those are not the same pressure.

Leaving a digital gauge in kPa in a PSI country The number looks 'too big' and people release air.

Changing the target because the converter looks precise Precision is not a new recommendation.

Safety notes

A converted number is only as good as the label you started from.

FAQ

Which unit should I keep? The one printed on your vehicle label.

Is bar the same as atmosphere? Close enough to confuse people. Use the converter, do not approximate at the pump.

Related next steps

Tire pressure calculatorCompare the door-label target with the gauge reading.Gas station pumpAdd air after you already know the target.Tire pressure lightCheck tires before you reset TPMS.Find the target PSIUse the door label, not the sidewall.