PSI to kPa to Bar Converter
The sidewall number is a maximum. The door sticker is what the car wants. Convert units here — do not mix them up.
What it does
Exact conversion between psi, kPa and bar using NIST constants (1 psi = 6.894757 kPa, 1 bar = 100 kPa).
How to use it
Enter a number and pick the unit it is already in. The other two fill in.
How to read the result
Check pressure cold — the car parked at least three hours, or driven less than a mile. Heat raises the reading; do not bleed hot air down to the cold spec. The max psi on the tire is for the tire’s load table, not daily driving. Towing and payload may need a higher cold pressure from the owner’s manual, still at or below the tire’s max.
What this does not calculate
We convert units. We do not know your GVWR, axle ratings, or the placard for your VIN.
Does not recommend a pressure for towing or a spare. Use the vehicle placard and owner’s manual.
Questions
- Why not use the number on the tire?
- That is the maximum cold pressure the tire can take for its rated load. Running it daily usually rides harsh and wears the center of the tread. The vehicle maker already did the math on the placard.
- TPMS light after a size change?
- Sensors care about pressure, not size. Recalibrate or refill to the placard (or the new size’s documented spec). A very different diameter can also annoy ABS, which is a different tool.
Related tools
- Cold vs Hot Tire Pressure CalculatorAir in a closed tire follows temperature. Check cold. Do not bleed a hot tire down to the door sticker.
- Tire Load Index Chart & Speed RatingsThe number before the letter (91H) is load. The letter is speed. Both have to meet the door-jamb spec.
- Tire Load Capacity vs Axle WeightWill these tires hold that axle? We add the pounds from the load-index table. We do not invent an air pressure.
Estimate — not a fitment approval.
