Instantly convert pressure between psi and bar. Choose a direction, enter a value, and click calculate.
Result will be shown in bar (and kPa).
Formulas: bar = psi × 0.0689476, psi = bar × 14.5038
What is a PSI Bar Calculator?
A psi bar calculator is a pressure conversion tool that helps you switch between two common pressure units: psi (pounds per square inch) and bar. This is useful when equipment labels, technical manuals, tire charts, compressors, or hydraulic tools use different unit systems.
Instead of estimating or using rough mental math, a calculator gives fast, consistent, and accurate results every time.
PSI vs Bar: Quick Definitions
- PSI (pounds per square inch): A unit widely used in the United States, especially for tires, air compressors, and pneumatics.
- Bar: A metric pressure unit commonly used in Europe and in many industrial contexts.
- kPa (kilopascal): Another metric pressure unit; many calculators also show this as a reference.
Exact Conversion Formulas
Convert psi to bar
bar = psi × 0.0689475729
Convert bar to psi
psi = bar × 14.5037738
These constants are mathematical inverses, so you can convert in either direction with confidence.
How to Use the Calculator
- Select conversion direction: PSI to Bar or Bar to PSI.
- Enter the pressure value.
- Choose how many decimal places you want.
- Click Calculate to see the converted pressure instantly.
Worked Examples
Example 1: Tire pressure
If a tire is rated at 35 psi, in bar this is:
35 × 0.0689476 = 2.4132 bar
Example 2: Compressor setting
If a compressor manual says 8 bar, the psi equivalent is:
8 × 14.5038 = 116.0302 psi
Example 3: Low-pressure regulator
A regulator set to 1.5 bar equals:
1.5 × 14.5038 = 21.7557 psi
Quick Reference Table
| PSI | Bar | kPa |
|---|---|---|
| 10 | 0.6895 | 68.95 |
| 20 | 1.3790 | 137.90 |
| 30 | 2.0684 | 206.84 |
| 40 | 2.7579 | 275.79 |
| 50 | 3.4474 | 344.74 |
| 100 | 6.8948 | 689.48 |
Where This Conversion Matters
- Car, motorcycle, and bicycle tire inflation
- Air compressors and pneumatic tools
- Hydraulic machinery and industrial maintenance
- SCUBA and paintball pressure systems
- Engineering documents across US and metric standards
Common Mistakes to Avoid
- Rounding too early: Keep a few extra decimals during intermediate calculations.
- Mixing gauge and absolute pressure: Make sure you compare like-for-like values (PSIG vs PSIA).
- Using approximate constants: For technical work, use full constants instead of rough estimates.
Final Note
This psi bar calculator is designed for speed and clarity. It is ideal for everyday conversions and many technical tasks. For safety-critical systems, always verify values against your equipment manual, local regulations, and calibrated instruments.