Tyre Pressure Converter
Instantly convert tyre pressure between PSI, bar, and kPa. Enter a value in any unit to see the equivalent in all others.
Enter any pressure value — others update instantly
pounds per square inch
metric (Europe)
kilopascal (SI)
Common tyre pressure reference
| Vehicle type | PSI | bar | kPa |
|---|---|---|---|
| Small / compact car | 30–33 | 2.07–2.28 | 207–228 |
| Mid-size sedan | 32–35 | 2.21–2.41 | 221–241 |
| SUV / 4×4 | 35–40 | 2.41–2.76 | 241–276 |
| Van / MPV | 40–50 | 2.76–3.45 | 276–345 |
| Bicycle (road) | 90–120 | 6.2–8.3 | 620–827 |
Always check your vehicle's door jamb sticker or owner's manual for the exact recommended pressure.
Why Correct Tyre Pressure Matters
Maintaining correct tyre pressure improves safety, extends tyre life, and saves fuel. Under-inflated tyres increase rolling resistance, generate more heat, and can cause blowouts. Over-inflated tyres reduce grip, increase ride harshness, and cause uneven tread wear in the centre.
Conversion Reference
- 1 PSI = 0.0689476 bar = 6.89476 kPa
- 1 bar = 14.5038 PSI = 100 kPa
- 1 kPa = 0.145038 PSI = 0.01 bar
Frequently Asked Questions
PSI stands for "pounds per square inch". It is the most common tyre pressure unit in the USA and UK. Most passenger car tyres are inflated to 30–35 PSI.
Bar is a metric unit of pressure equal to approximately one atmosphere. European tyre pressure gauges often display in bar. 1 bar ≈ 14.5 PSI.
kPa (kilopascal) is the SI unit for pressure. It is used in Canada, Australia, and parts of Asia. 100 kPa = 1 bar. Typical tyre pressure is 200–250 kPa.
The recommended tyre pressure is on a sticker inside your driver's door jamb, in your owner's manual, or sometimes on the fuel cap. Never use the maximum pressure printed on the tyre sidewall — that is the maximum the tyre can hold, not the recommended inflation.
Always check tyre pressure when cold — before you have driven more than a mile or two. Driving heats up the air inside the tyre, increasing pressure by 4–6 PSI. Checking hot tyres will give a falsely high reading.