How to Convert Tire Pressure
PSI, Bar, and kPa Made Simple
Get the ConversionsYour vehicle's tire pressure specification might be in PSI, but your gauge reads bar—or your European car shows kPa while your US gauge displays PSI. Converting between these units is straightforward once you know the formulas.
Step-by-Step Conversions
Converting PSI to Bar
- Find your tire pressure in PSI (e.g., 32 PSI)
- Divide by 14.504
- Result: 32 ÷ 14.504 = 2.21 bar
Converting PSI to kPa
- Find your tire pressure in PSI (e.g., 32 PSI)
- Multiply by 6.895
- Result: 32 × 6.895 = 221 kPa
Converting Bar to PSI
- Find your tire pressure in bar (e.g., 2.4 bar)
- Multiply by 14.504
- Result: 2.4 × 14.504 = 34.8 PSI
Car Tire Pressure Conversion Table
| PSI | Bar | kPa | Notes |
|---|---|---|---|
| 26 | 1.79 | 179 | Low (underinflated) |
| 28 | 1.93 | 193 | Economy cars (min) |
| 30 | 2.07 | 207 | Common front tire |
| 32 | 2.21 | 221 | Most common setting |
| 35 | 2.41 | 241 | Loaded vehicle |
| 36 | 2.48 | 248 | SUVs, crossovers |
| 40 | 2.76 | 276 | Light trucks |
| 44 | 3.03 | 303 | Heavy loads |
Bicycle Tire Pressure Conversion
| PSI | Bar | kPa | Bike Type |
|---|---|---|---|
| 30 | 2.07 | 207 | Fat bike |
| 40 | 2.76 | 276 | Mountain bike (low) |
| 50 | 3.45 | 345 | Mountain bike (high) |
| 60 | 4.14 | 414 | Hybrid/city bike |
| 80 | 5.52 | 552 | Touring bike |
| 100 | 6.89 | 689 | Road bike (low) |
| 110 | 7.58 | 758 | Road bike (typical) |
| 120 | 8.27 | 827 | Road bike (high) |
Truck and Commercial Vehicle Pressures
| PSI | Bar | kPa | Application |
|---|---|---|---|
| 50 | 3.45 | 345 | Pickup truck |
| 65 | 4.48 | 448 | Loaded pickup |
| 80 | 5.52 | 552 | Light commercial |
| 100 | 6.89 | 689 | Medium truck |
| 110 | 7.58 | 758 | Semi-truck steer axle |
| 120 | 8.27 | 827 | Semi-truck drive axle |
Finding Your Recommended Pressure
Where to Look
- Driver's door jamb: Sticker with recommended pressures
- Owner's manual: Full specifications
- Fuel door: Some vehicles show it here
- Tire sidewall: Shows MAXIMUM pressure (not recommended)
Important Notes
- Door jamb pressure is for COLD tires
- Pressure increases ~1 PSI per 10°F temperature
- Check pressure before driving or after sitting 3+ hours
- Sidewall max is NOT the recommended pressure
Conclusion
Converting tire pressure between PSI, bar, and kPa is straightforward with the right formulas. Remember: PSI ÷ 14.5 ≈ bar, and PSI × 6.9 ≈ kPa. For most purposes, the quick approximations (÷15 for bar, ×7 for kPa) work well. Always use the pressure recommended on your vehicle's door jamb or owner's manual—not the maximum shown on the tire itself.