PSI to Bar Calculator - Convert Pounds Per Square Inch to Bar | OmniCalculator.Space
The PSI to bar calculator from OmniCalculator.Space instantly converts pounds per square inch (PSI) to bar and vice versa. Perfect for tire pressure conversions, pneumatic systems, and international equipment specifications, this free pressure converter provides accurate bidirectional conversion using the formula bar = PSI × 0.0689476.
PSI to Bar Converter
Enter a value to convert
Quick Conversions (Tire Pressure)
30 PSI
= 2.07 bar
= 2.07 bar
32 PSI
= 2.21 bar
= 2.21 bar
35 PSI
= 2.41 bar
= 2.41 bar
40 PSI
= 2.76 bar
= 2.76 bar
PSI to Bar Conversion Formula
Converting between PSI and bar is essential for international applications, especially when dealing with European equipment specifications and tire pressure recommendations. The OmniCalculator.Space converter uses precise conversion factors for accurate results.
PSI to Bar Formula
bar = PSI × 0.0689476
Multiply PSI by 0.0689476 to get bar
Bar to PSI Formula
PSI = bar × 14.5038
Multiply bar by 14.5038 to get PSI
Conversion Factor Explanation
Understanding the PSI to bar conversion:
- 1 bar = 100,000 pascals = 100,000 N/m² = 100 kPa
- 1 PSI = 6,894.76 pascals = 0.0689476 bar
- Conversion ratio: 1 PSI = 0.0689476 bar (approximately 1/14.5)
- Inverse ratio: 1 bar = 14.5038 PSI
- Quick approximation: Divide PSI by 14.5 to estimate bar
PSI to Bar Conversion Table
Essential reference table for PSI to bar conversions, especially useful for tire pressure specifications with the OmniCalculator.Space calculator:
| PSI (Pounds per Square Inch) | Bar | Typical Application |
|---|---|---|
| 10 PSI | 0.689 bar | Low pressure systems |
| 15 PSI | 1.034 bar | Atmospheric pressure (~14.7 PSI) |
| 20 PSI | 1.379 bar | Bicycle tire (low) |
| 25 PSI | 1.724 bar | Bicycle tire (moderate) |
| 30 PSI | 2.068 bar | Car tire (minimum) |
| 32 PSI | 2.206 bar | Car tire (standard) |
| 35 PSI | 2.413 bar | Car tire (recommended) |
| 40 PSI | 2.758 bar | Car tire (high/loaded) |
| 50 PSI | 3.447 bar | Light truck tire |
| 100 PSI | 6.895 bar | Hydraulic/pneumatic systems |
How to Convert PSI to Bar
Converting PSI to bar is particularly important when traveling internationally or working with European equipment specifications. Follow these steps with the OmniCalculator.Space calculator:
- Identify your PSI value: Check tire pressure gauges, equipment specifications, or pressure readings in PSI.
- Multiply by 0.0689476: Use the precise conversion factor bar = PSI × 0.0689476 for accuracy.
- Round appropriately: For tire pressure, round to 2 decimal places (e.g., 2.07 bar).
- Quick estimate method: Divide PSI by 14.5 for a fast approximation (30 PSI ÷ 14.5 ≈ 2.07 bar).
- Use the calculator: Enter values directly into the OmniCalculator.Space PSI to bar converter for instant bidirectional conversion.
Conversion Example 1: Car Tire Pressure
Problem: Your car's recommended tire pressure is 32 PSI. Convert to bar for European travel.
Solution:
Using formula: bar = PSI × 0.0689476
bar = 32 × 0.0689476
bar = 2.2063232
Result: 2.21 bar
When inflating tires in Europe, set pressure to 2.2 bar for equivalent to 32 PSI.
Conversion Example 2: Quick Approximation
Problem: Quickly estimate 35 PSI in bar without calculator.
Quick Method:
Divide PSI by 14.5: 35 ÷ 14.5 ≈ 2.41 bar
Exact calculation: 35 × 0.0689476 = 2.413 bar
The quick approximation is accurate within 0.01 bar!
Conversion Example 3: Bar to PSI
Problem: European tire specification shows 2.5 bar. Convert to PSI.
Solution:
Using formula: PSI = bar × 14.5038
PSI = 2.5 × 14.5038
PSI = 36.2595
Result: 36.3 PSI
PSI vs Bar: Understanding the Difference
Both PSI and bar measure pressure but have different origins and common usage regions:
| Characteristic | PSI (Pounds per Square Inch) | Bar |
|---|---|---|
| System | Imperial (US Customary) | Metric (close to SI) |
| Definition | Force per square inch (lbf/in²) | 100,000 pascals (100 kPa) |
| Magnitude | Smaller unit | Larger unit (1 bar ≈ 14.5 PSI) |
| Common Use | United States, some UK applications | Europe, Asia, most of world |
| Tire Pressure | 30-35 PSI typical | 2.0-2.5 bar typical |
| Atmospheric | 14.7 PSI at sea level | 1.013 bar at sea level |
Applications of PSI to Bar Conversion
The OmniCalculator.Space PSI to bar converter is essential for numerous practical applications:
- Automotive: Converting tire pressure between American (PSI) and European (bar) specifications for international travel
- Bicycle Tires: Translating recommended pressures for imported bikes and international touring
- Pneumatic Tools: Setting air compressor pressures when using imported equipment
- HVAC Systems: Converting refrigeration and air conditioning pressures for international equipment
- Scuba Diving: Converting tank pressures between imperial and metric systems
- Manufacturing: Interpreting pressure specifications in international technical documentation
- Weather Instruments: Converting barometric pressure readings between units
- Industrial Pneumatics: Setting operating pressures for international machinery
Common PSI to Bar Conversions
Tire Pressure Conversions
Passenger Car Tires:
- 28 PSI = 1.93 bar (minimum cold pressure)
- 30 PSI = 2.07 bar (standard minimum)
- 32 PSI = 2.21 bar (most common recommendation)
- 33 PSI = 2.28 bar (European standard)
- 35 PSI = 2.41 bar (high performance/loaded)
- 40 PSI = 2.76 bar (maximum for some vehicles)
Bicycle Tires:
- 30 PSI = 2.07 bar (mountain bike low)
- 50 PSI = 3.45 bar (hybrid bike)
- 80 PSI = 5.52 bar (road bike moderate)
- 100 PSI = 6.89 bar (road bike high)
Atmospheric and System Pressures
Standard Pressures:
- 14.7 PSI = 1.013 bar (standard atmospheric pressure at sea level)
- 15 PSI = 1.034 bar (approximate atmospheric)
Pneumatic Systems:
- 60 PSI = 4.14 bar (typical shop air pressure)
- 90 PSI = 6.21 bar (industrial air tools)
- 120 PSI = 8.27 bar (high-pressure pneumatics)
Tips for Accurate PSI to Bar Conversion
Best Practices:
- Use precise factor: Always use 0.0689476 (not 0.069 or 0.07) for accuracy in tire pressure
- Check when cold: Tire pressure should be measured when tires are cold for accurate readings
- Round appropriately: For tires, round to 0.01 bar (2 decimal places)
- Quick mental math: Divide PSI by 14.5 for fast approximation (e.g., 30 PSI ÷ 14.5 ≈ 2.1 bar)
- Use OmniCalculator.Space: For guaranteed accuracy, use our calculator instead of manual conversion
- Verify gauge units: Ensure your pressure gauge displays the correct unit before inflating
- Account for altitude: Tire pressure can appear higher at altitude due to lower atmospheric pressure
- Temperature effects: Tire pressure increases approximately 1 PSI (0.07 bar) per 10°F temperature rise
Frequently Asked Questions
How do you convert PSI to bar?
To convert PSI to bar, multiply the PSI value by 0.0689476. The formula is: bar = PSI × 0.0689476. For example, to convert 32 PSI to bar: 32 × 0.0689476 = 2.21 bar. The OmniCalculator.Space PSI to bar calculator performs this conversion instantly with full precision. For quick mental estimates, divide PSI by 14.5 (e.g., 30 PSI ÷ 14.5 ≈ 2.07 bar), which gives results accurate within 0.01 bar for most applications.
What is the formula for converting PSI to bar?
The conversion formula is bar = PSI × 0.0689476, where 0.0689476 is the exact conversion factor. This factor comes from the relationship that 1 pound per square inch equals 0.0689476 bar. For the reverse conversion from bar to PSI, use: PSI = bar × 14.5038. These conversion factors are mathematical inverses (0.0689476 × 14.5038 ≈ 1), ensuring bidirectional accuracy in the OmniCalculator.Space converter for tire pressure and pneumatic applications.
How many bar is 30 PSI?
30 PSI equals 2.068 bar, typically rounded to 2.07 bar. To calculate: 30 × 0.0689476 = 2.068428 bar. This is a common minimum tire pressure for passenger vehicles. Many European car manufacturers recommend tire pressures in this range (2.0-2.2 bar or 29-32 PSI). The OmniCalculator.Space calculator shows that 30 PSI = 2.07 bar, which is the standard conversion used on tire pressure stickers and in vehicle manuals for international markets.
Is 32 PSI equal to 2.2 bar?
Yes, 32 PSI equals approximately 2.21 bar. The exact calculation is: 32 × 0.0689476 = 2.206 bar, which rounds to 2.2 or 2.21 bar. This is one of the most common tire pressure recommendations worldwide—32 PSI in American specifications corresponds to 2.2 bar in European specifications. Many vehicles have dual-unit tire pressure labels showing both values. The OmniCalculator.Space calculator confirms this commonly cited conversion with precision.
What is 35 PSI in bar?
35 PSI equals 2.413 bar, commonly rounded to 2.4 bar. To calculate: 35 × 0.0689476 = 2.413166 bar. This is a typical recommended tire pressure for many passenger vehicles, especially when carrying loads or for highway driving. It represents a good balance between fuel efficiency, tire wear, and ride comfort. European specifications often show this as 2.4 bar or sometimes 2.5 bar depending on rounding. Use the OmniCalculator.Space calculator for exact conversions.
How do you convert bar to PSI?
To convert bar to PSI, multiply the bar value by 14.5038. The formula is: PSI = bar × 14.5038. For example, to convert 2.5 bar to PSI: 2.5 × 14.5038 = 36.26 PSI. This is the inverse operation of PSI to bar conversion. The OmniCalculator.Space converter handles both directions automatically—simply enter your value in either field and the opposite field updates instantly with the correct conversion, making it easy to work with international tire pressure specifications.
Why do European countries use bar instead of PSI?
European countries use bar because it's part of the metric system, which is the standard measurement system in most of the world. Bar is more convenient for metric calculations and integrates seamlessly with other SI units (kilopascals, pascals). One bar is approximately equal to atmospheric pressure (1.013 bar at sea level), making it intuitive. The United States primarily uses PSI as part of the imperial system. The OmniCalculator.Space converter bridges this gap for international travelers and equipment users who need to work with both systems.
What is a good tire pressure in bar?
Good tire pressure for passenger cars typically ranges from 2.0-2.5 bar (29-36 PSI). Standard recommendations are usually around 2.2-2.3 bar (32-33 PSI) for front tires and slightly higher for rear tires when loaded. Exact recommendations vary by vehicle—always check the manufacturer's specification on your driver's door jamb. Underinflation (below 2.0 bar) reduces fuel efficiency and tire life, while overinflation (above 2.8 bar or 40 PSI) can cause harsh ride and uneven wear. Use the OmniCalculator.Space converter to translate PSI recommendations to bar.
How many PSI is 1 bar?
1 bar equals 14.5038 PSI, commonly rounded to 14.5 PSI. To calculate: 1 × 14.5038 = 14.5038 PSI. This is slightly less than standard atmospheric pressure at sea level (14.7 PSI or 1.013 bar). The 1 bar = 14.5 PSI conversion is useful as a reference point for quick estimates. Knowing this relationship helps you quickly determine that 2 bar ≈ 29 PSI, 3 bar ≈ 43.5 PSI, and so on. The OmniCalculator.Space calculator provides exact conversions for any bar or PSI value.
Is bar pressure the same as PSI?
No, bar and PSI are different units measuring the same physical quantity (pressure). One bar is much larger than one PSI—specifically, 1 bar = 14.5038 PSI. Bar is a metric unit (100,000 pascals) used internationally, while PSI is an imperial unit used primarily in the United States. For the same pressure, the bar number is smaller than the PSI number. For example, a car tire at 32 PSI equals 2.2 bar. The OmniCalculator.Space converter makes it easy to translate between these two common pressure units for any application.