Instant psig to bar Converter
Enter pressure in psig (pounds per square inch gauge) to convert it to bar.
Formula: bar = psig × 0.0689475729
Tip: You can press Enter inside the input box to convert quickly.
If you work with compressors, hydraulics, pumps, process lines, or lab instruments, you will often need a quick and accurate way to convert psig to bar. This calculator is built for that exact purpose. Enter your value once, and get the converted pressure instantly.
What does psig mean?
psig stands for pounds per square inch gauge. It measures pressure relative to atmospheric pressure. In other words, psig tells you how much pressure is above (or below) the surrounding air pressure.
- 0 psig means pressure equal to atmospheric pressure.
- Positive psig means pressure above atmospheric pressure.
- Negative psig means pressure below atmospheric pressure (vacuum conditions).
What is bar?
Bar is a metric pressure unit commonly used worldwide in engineering and industry. One bar is close to atmospheric pressure at sea level, which makes it intuitive for many practical applications.
Therefore, converting psig to bar (gauge) is a direct multiplication.
psig to bar conversion formula
Gauge pressure conversion
Use this formula for normal gauge-to-gauge conversion:
bar(g) = psig × 0.0689475729
Absolute pressure conversion (optional)
If you need bara (absolute bar), add atmospheric pressure first in psi:
bara = (psig + 14.6959) × 0.0689475729
This matters in thermodynamics, gas laws, and vacuum-sensitive calculations.
Quick reference table
| psig | bar(g) | Approximate use case |
|---|---|---|
| 10 | 0.689 | Low-pressure pneumatic systems |
| 30 | 2.068 | General shop air tools |
| 50 | 3.447 | Spray systems / medium pneumatics |
| 100 | 6.895 | Compressed air distribution |
| 150 | 10.342 | Industrial process equipment |
| 300 | 20.684 | High-pressure service lines |
How to use this calculator correctly
- Enter your pressure value in psig.
- Select your preferred decimal precision.
- Click Convert.
- Optionally check the box to also display bara.
Always verify whether your source reading is gauge or absolute. Mixing those units is a common source of engineering errors.
Common mistakes to avoid
- Confusing psig with psia.
- Assuming bar is always absolute (it can be gauge or absolute).
- Rounding too early in multi-step calculations.
- Using sea-level atmospheric assumptions at high altitude without correction.
When precision matters most
For general maintenance, two or three decimals are often enough. For design calculations, instrumentation calibration, and validation reports, keep more significant digits until the final step. This calculator lets you choose precision so you can match your workflow.
Typical engineering contexts
- Pneumatics: regulator setpoints and line pressure checks
- Hydraulics: pressure drop comparisons across components
- HVAC/Refrigeration: compressor and manifold gauge interpretations
- Laboratory work: controlled gas pressure experiments
Final takeaway
The psig to bar conversion is simple mathematically, but accuracy depends on unit clarity. Use the calculator above whenever you need quick, consistent pressure conversions and enable absolute pressure output when your application requires bara.