How To Convert Bar to Pounds per Square Inch
Formula: 1 bar = 14.5037738 psi.
Example: Convert 3.2 bar to psi.
3.2 × 14.5037738 = 46.4120762 psi.
To convert by hand, you multiply the pressure value in bar by 14.5037738. This works because bar and psi are just two different ways to measure the same thing, pressure. If you have a calculator, it takes a few seconds. If you need a quick estimate, you can also round the factor to 14.5 for mental math, but the exact factor is best for precise work.
Quick Answer
1 bar = 14.5037738 psi
- 0.5 bar = 7.2518869 psi
- 2 bar = 29.0075476 psi
- 10 bar = 145.037738 psi
Conversion Formula
psi = bar × 14.5037738
This means you take your value in bar, then multiply it by 14.5037738 to get the same pressure in psi. The number 14.5037738 is the fixed conversion factor between these two units, based on their standard definitions.
- Write down the pressure in bar.
- Multiply it by 14.5037738.
- The result is the pressure in psi.
Bar
A bar is a metric unit of pressure equal to 100,000 pascals (Pa). Its symbol is bar.
The bar became common in engineering and weather-related work because it is close to typical atmospheric pressure. It is widely used in Europe and in many technical fields, even though the SI unit of pressure is the pascal.
- Tire pressure on some gauges (especially outside the US)
- Air compressors and pneumatic tools
- Scuba diving tank and regulator pressure
- Industrial hydraulics and pumps
- Weather and atmospheric pressure reporting (often in related units like millibar)
Pound per square inch
A pound per square inch is a pressure unit that measures pounds of force on one square inch of area. Its symbol is psi.
PSI developed from Imperial and US customary measurement systems and became standard in many American industries. You will see it often on equipment, vehicles, and pressure gauges in the United States.
- Car and bike tire pressure labels and gauges
- Household water pressure readings
- Air tools and shop compressor regulators
- HVAC system pressure checks
- Industrial pressure gauges and safety limits
Is this Conversion of Bar To Pounds per Square Inch Accurate?
Yes. This conversion is based on fixed, published definitions of the units. A bar is defined as exactly 100,000 pascals. A psi is defined from the standard relationship between pounds-force and square inches, which equals 6,894.757293168 pascals per psi. Using these definitions gives a stable factor of 1 bar = 14.5037738 psi, which is consistent with engineering references and technical documentation. For more details about how we treat rounding and standards, see our accuracy standards.
Real Life Examples
Here are practical pressure values you may actually see, converted from bar to psi using the same factor.
- Car tire check: A tire gauge shows 2.2 bar. That is 2.2 × 14.5037738 = 31.9083024 psi, close to many passenger-car recommendations.
- Bike tire setup: A road bike pump is set to 6 bar. That equals 87.0226428 psi, a common range for narrower tires.
- Workshop air compressor: A regulator is set to 8 bar. That is 116.0301904 psi, often used for air tools.
- Scuba cylinder reading: A tank shows 200 bar. That equals 2900.75476 psi, useful when comparing to psi-rated gauges.
- Pressure washer spec: A spec lists 150 bar. That equals 2175.56607 psi, helpful when shopping in a psi-based market.
- Hydraulic system: A circuit runs at 250 bar. That equals 3625.94345 psi, common in heavy equipment.
- Low pressure testing: A leak test uses 0.3 bar. That equals 4.35113214 psi, useful for sensitive systems.
Quick Tips
- For exact results, always multiply by 14.5037738.
- For a fast estimate, use 1 bar ≈ 14.5 psi, then refine if needed.
- To check your math, remember 2 bar should be just double 1 bar.
- If your answer seems too small, you may have divided instead of multiplied.
- Keep the same number of decimal places across a report for clean comparisons.
- When reading gauges, note if they show gauge pressure (relative) or absolute pressure, the unit conversion is the same, but the reference point differs.