Same input, every pressure unit — tap a tile to set the right-hand unit.
PSI, bar, and kPa for tires and boost
Door stickers in North America are almost always psi; Euro and OEM service data often use bar or kPa.
1 bar ≈ 14.5 psi ≈ 100 kPa. Boost gauges are frequently bar while the wastegate spring is sold in psi.
This is unit math only — it does not tell you the correct cold pressure for a load or tow.
Pressure units collide on every mixed-fleet bench: a US placard at 32 psi, a TPMS spec in kPa, a boost controller in bar, and a fuel-pressure regulator in psi. This converter is for those cross-checks, not for inventing a tire pressure.
Enter the number on the gauge or the sticker and read the rest of the board. 32 psi is about 2.21 bar or 221 kPa — that is a cold-placard conversion, not a recommendation to run 2.21 bar on a different vehicle.
When you are changing load, passengers, or a trailer, use the tire pressure calculator. When you are matching a 1.2 bar spring to a psi gauge, stay here.
Common pressure conversions
Typical shop pairs. Boost figures below are gauge-style comparisons, not manifold absolute pressure.
PSI, bar, and kPa
You have
Equals
Also
32 psi
2.21 bar
221 kPa
35 psi
2.41 bar
241 kPa
1.00 bar
14.5 psi
100 kPa
15 psi boost
1.03 bar
103 kPa
43.5 psi
3.00 bar
300 kPa
1 psi ≈ 6.895 kPa ≈ 0.06895 bar. 1 atm = 101.325 kPa. Rounded for the bench.
When this is the wrong tool
A unit swap does not adjust recommended PSI for axle load or towing. Use the tire pressure calculator for that. Absolute vs gauge boost (atmosphere on the stack) is a measurement convention, not something this board invents.
How to convert psi and bar
Enter the printed pressure. Use the door sticker, gauge, or spring card as printed.
Match the unit. psi, bar, kPa, or atm — pick what the paper actually says.
Read every scale. The board shows the same pressure in every unit. Tap a tile to set the right-hand card.
Pressure converter FAQ
32 psi ≈ 2.21 bar ≈ 221 kPa. That is a typical cold-placard conversion, not a universal target pressure.
Use it to translate the placard into the unit your gauge shows. Still follow the vehicle sticker for the recommended cold pressure, and use the tire pressure calculator when load or towing changes the target.
1 bar ≈ 14.50 psi ≈ 100 kPa. A “1 bar boost” gauge reading is about 14.5 psi of gauge boost.
Close, not identical. 1 atm = 101.325 kPa; 1 bar = 100 kPa. For shop tire work the difference is small; for lab or aviation numbers, keep them separate.