4 psi ≈ 0.27579 bar. To convert pounds per square inch to bars, multiply by 0.0689476: 4 × 0.0689476 = 0.27579.
How to convert pounds per square inch to bars
bar = psi × 0.0689476
- 1 psi = 0.0689476 bar (and 1 bar = 14.503768 psi).
- Multiply the amount by the factor: 4 × 0.0689476 = 0.27579.
- Answer: 4 psi ≈ 0.27579 bar (rounded to 6 significant figures).
Pounds Per Square Inch to Bars table
| Pounds Per Square Inch (psi) | Bars (bar) |
|---|---|
| 1 psi | 0.0689476 bar |
| 2 psi | 0.137895 bar |
| 3 psi | 0.206843 bar |
| 4 psi | 0.27579 bar |
| 5 psi | 0.344738 bar |
| 6 psi | 0.413686 bar |
| 7 psi | 0.482633 bar |
| 8 psi | 0.551581 bar |
| 9 psi | 0.620528 bar |
| 10 psi | 0.689476 bar |
| 11 psi | 0.758424 bar |
| psi | bar |
|---|---|
| 1 psi | 0.0689476 bar |
| 5 psi | 0.344738 bar |
| 10 psi | 0.689476 bar |
| 50 psi | 3.4474 bar |
| 100 psi | 6.8948 bar |
| 1,000 psi | 68.9476 bar |
Good to know
Most passenger-car tyres run at about 30–35 psi (≈ 207–241 kPa, 2.1–2.4 bar). Use the pressure on your vehicle’s door-jamb placard.
1 psi = 6.894757 kPa; 1 bar = 100 kPa ≈ 14.5038 psi.