Last updated: September 16, 2026
Quick answer: Multiply PSI by 0.0689476 to get bar. 1 psi ≈ 0.069 bar, and 1 bar ≈ 14.504 psi. So typical car tire pressure of 32 psi = 2.21 bar, and road bike pressure of 100 psi = 6.89 bar.
PSI to Bar
Instantly convert psi to bar with fast, accurate, real-time results.
PSI (pounds per square inch) is the pressure unit used in the United States for tires, air compressors, and plumbing. Bar is the metric equivalent, used across Europe, in meteorology, and in most engineering and industrial contexts. The conversion is simple multiplication, but understanding which unit your gauge uses — and what range is correct for your application — is what keeps tires properly inflated and hydraulic systems safe.
Formula: PSI to Bar
The definition: 1 bar = 100,000 pascals (Pa). One psi = 6,894.76 Pa. Dividing: 6,894.76 ÷ 100,000 = 0.0689476 bar per psi. For quick mental math, use 1 psi ≈ 0.069 bar — the error is less than 0.01%.
Reverse: bar to psi
Approximately: multiply bar by 14.5 to get psi. A European tire sticker saying 2.5 bar = 2.5 × 14.5 = 36.25 psi.
Car and Truck Tire Pressure Guide
Correct tire pressure improves fuel economy, handling, and tire life. The recommended pressure is on a sticker inside the driver's door jamb (not on the tire sidewall, which shows the maximum rated pressure).
| Vehicle type | Typical front (psi) | Front (bar) | Typical rear (psi) | Rear (bar) |
|---|---|---|---|---|
| Compact car (e.g., Toyota Corolla) | 32–35 psi | 2.2–2.4 bar | 32–35 psi | 2.2–2.4 bar |
| Mid-size sedan (e.g., Honda Accord) | 32–36 psi | 2.2–2.5 bar | 32–36 psi | 2.2–2.5 bar |
| SUV / crossover | 33–38 psi | 2.3–2.6 bar | 33–38 psi | 2.3–2.6 bar |
| Light truck / pickup | 35–45 psi | 2.4–3.1 bar | 50–65 psi | 3.4–4.5 bar |
| Electric vehicles (heavier) | 38–45 psi | 2.6–3.1 bar | 38–45 psi | 2.6–3.1 bar |
| Spare (full-size) | Same as regular | — | — | — |
| Compact spare ("donut") | 60 psi | 4.1 bar | — | — |
Bicycle Tire Pressure Chart
Bike tire pressure varies enormously by type and rider weight. Unlike car tires, the "correct" pressure for a bike is more of a range than a single figure.
| Bike type / tire | Typical range (psi) | In bar | Notes |
|---|---|---|---|
| Road bike (23–25 mm tire) | 90–120 psi | 6.2–8.3 bar | Higher for lighter riders; tubeless runs lower |
| Road bike (28–32 mm tire) | 70–90 psi | 4.8–6.2 bar | Common on gravel/endurance bikes |
| Gravel bike (35–45 mm) | 40–65 psi | 2.8–4.5 bar | Lower for rougher terrain |
| Mountain bike (2.2–2.4 in) | 25–35 psi | 1.7–2.4 bar | Tubeless: 22–30 psi common |
| Mountain bike (2.5+ in) | 18–28 psi | 1.2–1.9 bar | Enduro / downhill use |
| Hybrid / city bike | 50–70 psi | 3.4–4.8 bar | Efficiency on pavement |
| BMX | 55–110 psi | 3.8–7.6 bar | Varies by discipline |
| E-bike (heavier) | 35–50 psi | 2.4–3.4 bar | Check manufacturer recommendation |
Other Pressure Uses: Weather, Hydraulics, Scuba
Atmospheric / weather pressure
Standard atmospheric pressure (sea level) is 1 atm = 1.01325 bar = 14.696 psi. Weather stations report pressure in millibars (mbar) or hectopascals (hPa), where 1 mbar = 1 hPa. Normal sea-level pressure is about 1,013 mbar. Storms drop below ~990 mbar (≈ 14.36 psi); high-pressure fair weather is above 1,020 mbar (≈ 14.8 psi).
Hydraulic systems
| Application | Typical working pressure | In psi | In bar |
|---|---|---|---|
| Home water mains | Normal supply | 40–80 psi | 2.8–5.5 bar |
| Pressure washer (residential) | — | 1,200–2,000 psi | 83–138 bar |
| Hydraulic car jack | — | ~1,000 psi | ~69 bar |
| Industrial hydraulics | — | 1,000–5,000 psi | 69–345 bar |
| Espresso machine | — | ~130 psi | ~9 bar |
| CO₂ cartridge (airsoft) | — | ~900 psi | ~62 bar |
Scuba diving
Scuba tanks are filled to 200–300 bar (2,900–4,350 psi). Dive regulators drop this to a breathable ~9–15 bar (130–218 psi) at the first stage, then to ambient pressure at the second stage. A full aluminum 80 cylinder holds about 3,000 psi (207 bar); divers surface with a minimum of 500 psi (34 bar) reserve.
Full PSI to Bar Table
| psi | bar | psi | bar |
|---|---|---|---|
| 1 psi | 0.069 bar | 40 psi | 2.76 bar |
| 2 psi | 0.138 bar | 45 psi | 3.10 bar |
| 5 psi | 0.345 bar | 50 psi | 3.45 bar |
| 10 psi | 0.689 bar | 60 psi | 4.14 bar |
| 14.5 psi | 1.00 bar | 65 psi | 4.48 bar |
| 14.696 psi | 1.013 bar | 70 psi | 4.83 bar |
| 15 psi | 1.034 bar | 80 psi | 5.52 bar |
| 20 psi | 1.379 bar | 90 psi | 6.21 bar |
| 25 psi | 1.724 bar | 100 psi | 6.89 bar |
| 28 psi | 1.931 bar | 120 psi | 8.27 bar |
| 30 psi | 2.069 bar | 150 psi | 10.34 bar |
| 32 psi | 2.207 bar | 200 psi | 13.79 bar |
| 35 psi | 2.413 bar | 250 psi | 17.24 bar |
| 36 psi | 2.482 bar | 300 psi | 20.68 bar |
| 38 psi | 2.620 bar | 500 psi | 34.47 bar |
FAQs About PSI to Bar
How do I convert PSI to bar quickly?
Multiply PSI by 0.069 (or more precisely, 0.0689476). For a rough check: divide PSI by 14.5. So 35 psi ÷ 14.5 ≈ 2.41 bar. The mental shortcut "divide by 14.5" is accurate to within 0.03%.
Is 2.2 bar the same as 32 psi?
Almost — 2.2 bar = 31.9 psi (2.2 × 14.504), which rounds to 32 psi. This is a very common car tire pressure, and 2.2 bar is the European equivalent you'll see on stickers in countries that use bar.
What is 1 bar in PSI?
1 bar = 14.5038 psi. Standard atmospheric pressure is 1.01325 bar = 14.696 psi. So 1 bar is very close to — but slightly below — atmospheric pressure at sea level.
My European tire sticker says 2.5 bar — how many psi is that?
2.5 bar × 14.504 = 36.3 psi. Round to 36 psi when inflating with a US-style gauge. Always check the door jamb sticker for your specific vehicle — it may specify front and rear pressures separately.
What's the difference between PSI, bar, kPa, and atm?
All are pressure units measuring force per area. 1 atm (atmosphere) = 1.01325 bar = 101.325 kPa = 14.696 psi. The bar is convenient because it's close to 1 atm. kPa is the strict SI unit. PSI is used mainly in the US and UK. You'll see all four depending on the industry and country.
What PSI should a football (soccer ball) be?
FIFA regulations specify 8.5–15.6 psi (0.6–1.1 bar) for a standard football. The NFL specifies 12.5–13.5 psi (0.86–0.93 bar) for American footballs. NBA basketballs: 7.5–8.5 psi (0.52–0.59 bar).
Sources
References & further reading
- Bureau International des Poids et Mesures (BIPM) — SI units — the pascal (Pa) — 1 bar = 10⁵ Pa (not an SI unit, but accepted for use)
- NIST — Guide for the Use of the International System of Units — pressure unit conversions
- NHTSA (US Dept. of Transportation) — Tire Safety — proper tire inflation guidance
- FIFA — Laws of the Game — ball pressure specification 0.6–1.1 bar (8.5–15.6 psi)
- ISO 2533:1975 — Standard Atmosphere — 101,325 Pa = 1 atm = 14.696 psi
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