Convert Pounds per Square Inch to Bar
Instantly convert Pounds per Square Inch (psi) to Bar (bar) with our free online calculator.
Formula: psi to bar — multiply by 0.0689476
Reference Table
| Pounds per Square Inch (psi) | Bar (bar) |
|---|---|
| 1 | 0.0689476 |
| 5 | 0.344738 |
| 10 | 0.689476 |
| 25 | 1.72369 |
| 50 | 3.44738 |
| 100 | 6.89476 |
How to Convert Pounds per Square Inch to Bar
Formula
To convert Pounds per Square Inch (psi) to Bar (bar): multiply by 0.0689476
Step-by-Step
- Start with your value in Pounds per Square Inch (psi).
- Multiply by 0.0689476 to perform the conversion.
- The result is your value expressed in Bar (bar).
Conversion Factor
1 psi = 0.0689476 bar
Reverse Factor
1 bar = 14.5038 psi
Worked Example
Convert 25 Pounds per Square Inch to Bar: 25 psi = 1.72369 bar
About Pound per Square Inch (psi)
An imperial unit of pressure equal to one pound-force applied over one square inch (exactly 6,894.757 Pa per NIST SP 811). PSI is the dominant US pressure unit and remains the working unit in most US-built industrial, automotive, and consumer equipment: passenger-car tire inflation (32-35 psi cold), compressed air shop systems (typically 100-150 psi), hydraulic equipment (1,500-3,000 psi mobile, up to 10,000 psi on press brakes), ammunition chamber pressures (SAAMI specs in psi), municipal potable water supply (~40-80 psi at the meter), and natural gas distribution pressures. US engineering textbooks and the ASME B31 pipe codes, API piping specifications, and AWWA waterworks standards quote allowable pressures in psi. Engineers should distinguish gauge psi (psig — pressure above atmospheric) from absolute psi (psia — pressure above perfect vacuum); 0 psig = 14.696 psia at sea level. 1 psi = 6.895 kPa = 0.0689 bar = 51.715 mmHg.
About Bar (bar)
A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1.01325 bar). Defined by IUPAC and accepted for use with the SI by the BIPM, the bar is not itself an SI-proper unit but is universally recognized in engineering. Bars are the default unit in European industry for compressed gas systems (compressed air at 6-10 bar shop pressure), hydraulics (mobile equipment at 200-400 bar working pressure), and chemical process plants. Car tire pressures in much of the world outside the US are specified in bar (a typical passenger car runs ~2.2 bar / 32 psi cold). Gauges on scuba cylinders (200 bar fill / ~2900 psi), brewery CO₂ tanks, fire suppression systems, and espresso machines (9 bar extraction pressure) all read in bar. 1 bar = 14.504 psi = 100 kPa = 0.9869 atm.
Quick Facts
- 1 Pound per Square Inch equals 0.0689476 Bar
- 1 Bar equals 14.5038 Pounds per Square Inch
- Pound per Square Inch is a unit of pressure
- Bar is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
- The Pound per Square Inch belongs to the imperial system
- The Bar belongs to the metric system
Common Pound per Square Inch to Bar Conversions
| Pounds per Square Inch (psi) | Bar (bar) |
|---|---|
| 0.1 | 0.00689476 |
| 0.5 | 0.0344738 |
| 1 | 0.0689476 |
| 2 | 0.137895 |
| 5 | 0.344738 |
| 10 | 0.689476 |
| 14.696 | 1.01325 |
| 15 | 1.03421 |
| 20 | 1.37895 |
| 25 | 1.72369 |
| 50 | 3.44738 |
| 100 | 6.89476 |
| 150 | 10.3421 |
| 200 | 13.7895 |
| 500 | 34.4738 |
| 1000 | 68.9476 |
Understanding Pounds per Square Inch
The Pound per Square Inch (symbol: psi) is a unit of pressure. An imperial unit of pressure equal to one pound-force applied over one square inch (exactly 6,894.757 Pa per NIST SP 811). PSI is the dominant US pressure unit and remains the working unit in most US-built industrial, automotive, and consumer equipment: passenger-car tire inflation (32-35 psi cold), compressed air shop systems (typically 100-150 psi), hydraulic equipment (1,500-3,000 psi mobile, up to 10,000 psi on press brakes), ammunition chamber pressures (SAAMI specs in psi), municipal potable water supply (~40-80 psi at the meter), and natural gas distribution pressures. US engineering textbooks and the ASME B31 pipe codes, API piping specifications, and AWWA waterworks standards quote allowable pressures in psi. Engineers should distinguish gauge psi (psig — pressure above atmospheric) from absolute psi (psia — pressure above perfect vacuum); 0 psig = 14.696 psia at sea level. 1 psi = 6.895 kPa = 0.0689 bar = 51.715 mmHg.
It belongs to the imperial measurement system.
Pounds per Square Inch are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Understanding Bar
The Bar (symbol: bar) is a unit of pressure. A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1.01325 bar). Defined by IUPAC and accepted for use with the SI by the BIPM, the bar is not itself an SI-proper unit but is universally recognized in engineering. Bars are the default unit in European industry for compressed gas systems (compressed air at 6-10 bar shop pressure), hydraulics (mobile equipment at 200-400 bar working pressure), and chemical process plants. Car tire pressures in much of the world outside the US are specified in bar (a typical passenger car runs ~2.2 bar / 32 psi cold). Gauges on scuba cylinders (200 bar fill / ~2900 psi), brewery CO₂ tanks, fire suppression systems, and espresso machines (9 bar extraction pressure) all read in bar. 1 bar = 14.504 psi = 100 kPa = 0.9869 atm.
It belongs to the metric measurement system.
Bar are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Why Convert Pounds per Square Inch to Bar?
Engineers, mechanics, and scientists frequently need to convert pressure between Pounds per Square Inch and Bar when working with different measurement standards. Tire pressure, blood pressure readings, weather barometric measurements, and industrial process specifications may all use different pressure units depending on the region or discipline. Reliable conversion prevents equipment misuse and ensures safety.
Frequently Asked Questions
How do I convert Pounds per Square Inch to Bar?
An imperial unit of pressure equal to one pound-force applied over one square inch (exactly 6,894. To convert Pounds per Square Inch to Bar, multiply by 0.0689476. For example, 25 psi equals 1.72369 bar.
How many Bar are in 1 Pound per Square Inch?
There are 0.0689476 Bar in 1 Pound per Square Inch.
How many Pounds per Square Inch are in 1 Bar?
There are 14.5038 Pounds per Square Inch in 1 Bar.
What is the formula for Pound per Square Inch to Bar conversion?
The formula is: multiply by 0.0689476. This means 1 psi = 0.0689476 bar.
Is a Pound per Square Inch bigger than a Bar?
Yes. One Pound per Square Inch is larger than one Bar because 1 psi equals 0.0689476 bar, which is less than 1.
When do you need to convert between Pounds per Square Inch and Bar?
A metric unit of pressure equal to exactly 100,000 pascals (100 kPa), approximately the average sea-level atmospheric pressure on Earth (1 atm = 1. Pound per Square Inch and Bar are both pressure units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.