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PSI to Bar Converter

Convert PSI to bar, kPa, and atm — tire pressures, turbo boost, hydraulics.

PSI (pounds per square inch) and bar are the world's two most common pressure units — PSI dominates in the US, bar in Europe. Whether you're inflating tires, reading a boost gauge, or working on hydraulic systems, this converter handles every pressure unit in one shot.

32 PSI equals
2.2063 bar

Typical passenger-car tire pressure is 30–35 PSI (cold). Check the door jamb sticker for your car's spec.

UnitValue
Bar2.2063 bar
Kilopascals (kPa)220.6323 kPa
Megapascals (MPa)0.2206 MPa
Atmospheres (atm)2.1775 atm

PSI vs Bar: Which System to Use

The US, Canada, and some Commonwealth countries use PSI for everyday applications. Europe and most of the rest of the world uses bar (or kPa for larger-scale engineering). For turbocharger tuning, bar is almost universally preferred in technical documentation regardless of country.

  • 1 bar = 14.5038 PSI (or more precisely: 1 PSI = 0.0689476 bar)
  • 1 bar = 100,000 Pa = 100 kPa = 0.1 MPa
  • 1 atm = 1.01325 bar = 14.6959 PSI (standard atmospheric pressure)
  • Quick mental math: PSI ÷ 14.5 ≈ bar (accurate to ~0.3%)

Tire Pressure: PSI vs Bar at the Pump

Tire pressure is the most common reason people need this conversion. Most US gas station gauges read PSI; most European service stations use bar. Your vehicle's spec (door jamb sticker) shows the correct cold pressure — always use the manufacturer's number, not a 'recommended' figure.

  • Typical passenger car: 30–35 PSI (2.07–2.41 bar)
  • Light truck / SUV: 35–45 PSI (2.41–3.10 bar)
  • Motorcycle front: 28–36 PSI (1.93–2.48 bar)
  • Bicycle road tires: 80–130 PSI (5.5–9.0 bar) — far higher than car tires
  • Always measure cold (car parked 3+ hours) — hot tires read 4–6 PSI higher

Turbocharger Boost Pressure

Turbo boost is measured in PSI or bar above atmospheric pressure (gauge pressure). '1 bar of boost' means 1 bar above the ambient ~1 bar, so absolute intake pressure is ~2 bar — roughly doubling the air supply to the engine.

  • Stock turbo cars: 0.5–1.0 bar boost (7–15 PSI)
  • Lightly tuned: 1.0–1.5 bar (15–22 PSI)
  • Aggressively tuned street cars: 1.5–2.0 bar (22–29 PSI)
  • Race/drag: 2.0–4.0+ bar (29–58+ PSI) — requires forged internals
  • Each additional 0.5 bar roughly adds 20–30% more airflow if the engine can support it

Hydraulic and Pneumatic Systems

Industrial applications use much higher pressures where MPa (megapascals) are more practical than kPa or bar. Hydraulic jacks, construction equipment, and injection moulding machines operate in the hundreds of bar range.

  • Standard pneumatic tools: 90–120 PSI (6.2–8.3 bar)
  • Hydraulic car lifts: 2,000–3,000 PSI (138–207 bar)
  • Heavy equipment hydraulics: 3,000–5,000 PSI (207–345 bar)
  • Fuel rail pressure (direct injection): 2,000–3,000 PSI (138–207 bar)

How to Convert PSI to Bar

Two ways to convert pressure units accurately.

  1. 1
    Use the calculator above
    Enter any PSI value and the calculator instantly returns the exact bar, kPa, MPa, and atm equivalents.
  2. 2
    Quick mental conversion
    Divide PSI by 14.5 to get approximate bar. Example: 29 PSI ÷ 14.5 = 2.0 bar. Accurate to about 0.3% — good enough for tire pressure.
  3. 3
    Exact formula
    Multiply PSI × 0.0689476 = bar. Or multiply PSI × 6.89476 = kPa. For MPa, multiply PSI × 0.00689476.

FAQ

How do you convert PSI to bar?
Multiply PSI by 0.0689476. So 30 PSI × 0.0689476 ≈ 2.07 bar.
What's 32 PSI in bar?
32 PSI = 2.206 bar (to 3 decimal places). That's a typical cold-tire pressure for passenger cars.
Is bar the same as atmosphere?
Very close, but not identical. 1 atm = 1.01325 bar. One bar is defined as 100,000 pascals.
What about turbo boost pressure?
1 bar of boost = 14.5 PSI above atmospheric. So '1 bar of boost' roughly doubles the engine's air supply (from ~14.7 psi atmospheric to ~29.2 psi absolute).
What is kPa and how does it relate to PSI?
Kilopascals (kPa) are the SI unit. 1 PSI = 6.89476 kPa. Tire pressures in Canada and Europe are often listed in kPa — a typical 32 PSI tire reads ~220 kPa.

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