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Convert pressure from Pascals (Pa) to PSI (pounds per square inch) instantly with accurate conversion formulas and reference tables
Pa to PSI: PSI = Pascals ÷ 6894.76
PSI to Pa: Pascals = PSI × 6894.76
| Pascals (Pa) | PSI | Common Use |
|---|---|---|
| 1,000 | 0.145 | Very low pressure (HVAC systems) |
| 5,000 | 0.725 | Low water pressure |
| 10,000 | 1.45 | Low air pressure |
| 20,000 | 2.9 | Bicycle tire (partial) |
| 50,000 | 7.25 | Low hydraulic pressure |
| 100,000 | 14.5 | Near atmospheric pressure |
| 101,325 | 14.696 | Standard atmosphere (sea level) |
| 150,000 | 21.76 | High bicycle tire pressure |
| 200,000 | 29.01 | Low car tire pressure |
| 220,000 | 31.91 | Typical car tire pressure |
| 250,000 | 36.26 | High car tire pressure |
| 300,000 | 43.51 | Light truck tire |
| 500,000 | 72.52 | Industrial air systems |
| 1,000,000 | 145.04 | High-pressure hydraulics |
| 5,000,000 | 725.19 | Industrial hydraulic systems |
| 10,000,000 | 1450.38 | Waterjet cutting systems |
Pascal (Pa) is the SI (International System of Units) unit of pressure, named after French mathematician and physicist Blaise Pascal. One Pascal is defined as one Newton of force applied over one square meter of area (1 Pa = 1 N/m²). It's a relatively small unit, so pressure is often measured in kilopascals (kPa = 1,000 Pa) or megapascals (MPa = 1,000,000 Pa) for practical applications.
PSI (pounds per square inch) is an imperial unit of pressure commonly used in the United States and some other countries. It measures the force in pounds applied over one square inch of area. PSI is widely used in automotive applications (tire pressure), industrial systems, compressed air, and hydraulics because it provides convenient, easy-to-read numbers for everyday use.
The conversion between these units is fixed: 1 PSI = 6,894.76 Pascals. This means that PSI represents much higher pressure values than Pascal when using the same number. For example, a car tire at 32 PSI contains pressure of 220,632 Pascals (or 220.6 kPa).
Both units measure the same physical quantity—pressure—but serve different purposes. Pascals are standard in scientific and international contexts, while PSI remains prevalent in American engineering, automotive, and industrial sectors due to historical usage and the practical scale of the numbers involved.
Alternatively: PSI = Pascals × 0.000145038
Problem: Convert standard atmospheric pressure (101,325 Pa) to PSI.
Problem: A tire pressure gauge shows 220,000 Pa. What is this in PSI?
Problem: A hydraulic system operates at 5,000,000 Pa. Convert to PSI.
To quickly estimate: divide Pa by 7,000 to get approximate PSI. For example, 210,000 Pa ÷ 7,000 ≈ 30 PSI. This gives you a ballpark figure that's accurate to within 2% for quick checks.
| Pascals (Pa) | kPa | PSI |
|---|---|---|
| 10,000 | 10 | 1.45 |
| 20,000 | 20 | 2.9 |
| 30,000 | 30 | 4.35 |
| 50,000 | 50 | 7.25 |
| 75,000 | 75 | 10.88 |
| 100,000 | 100 | 14.5 |
| Pascals (Pa) | kPa | PSI |
|---|---|---|
| 150,000 | 150 | 21.76 |
| 200,000 | 200 | 29.01 |
| 250,000 | 250 | 36.26 |
| 300,000 | 300 | 43.51 |
| 400,000 | 400 | 58.02 |
| 500,000 | 500 | 72.52 |
| Pascals (Pa) | MPa | PSI |
|---|---|---|
| 1,000,000 | 1 | 145.04 |
| 2,000,000 | 2 | 290.08 |
| 5,000,000 | 5 | 725.19 |
| 7,000,000 | 7 | 1015.26 |
| 10,000,000 | 10 | 1450.38 |
Tire pressure specifications vary by region. US vehicles use PSI, while international standards use kPa. Accurate conversion ensures proper tire inflation for safety and fuel efficiency.
Hydraulic systems, compressed air, and industrial equipment use both metric and imperial units. Engineers must convert accurately to ensure system compatibility and safety.
Quality control and material testing require precise pressure measurements. Converting between Pa and PSI ensures specifications meet international standards and regulations.
Heating, ventilation, and air conditioning systems operate at specific pressures. Converting units helps technicians diagnose problems and ensure efficient operation across different equipment.
Many digital gauges can display in multiple units. Double-check whether you're reading Pa, kPa, bar, or PSI before converting. Some gauges show both units simultaneously, which can prevent confusion.
Standard atmospheric pressure (101,325 Pa = 14.696 PSI) is a useful benchmark. If your converted value seems drastically different from this reference, double-check your calculation.
This is the most common error. 1 kPa = 1,000 Pa. If you see 220 kPa and convert it as 220 Pa, your PSI result will be off by a factor of 1,000. Always check the prefix (kilo = 1,000, Mega = 1,000,000).
For most applications, 2-3 decimal places provide sufficient accuracy. Tire pressure can be rounded to 0.1 PSI, while hydraulic systems may need 0.01 PSI precision. Match your precision to your application.
PSI can be gauge pressure (psig, relative to atmosphere) or absolute pressure (psia, relative to perfect vacuum). Most tire and hydraulic pressures are gauge pressures. Always clarify which type you're working with.
Pressure changes with temperature. For precision work, measure and convert at the operating temperature. Tire pressure, for example, increases as tires warm up during driving.
One Pascal (Pa) equals 0.000145038 PSI. Since a Pascal is a very small unit of pressure, it takes approximately 6,894.76 Pascals to equal 1 PSI. This conversion factor is commonly used in engineering and scientific applications where precise pressure measurements are required.
One standard atmosphere (atm) equals exactly 101,325 Pascals or 14.696 PSI. This is the average atmospheric pressure at sea level and is commonly used as a reference point for pressure measurements in weather forecasting, aviation, and scientific experiments.
To convert Pascals to PSI, divide the Pascal value by 6,894.76. For example, 100,000 Pa ÷ 6,894.76 = 14.504 PSI. This formula works because 1 PSI is defined as exactly 6,894.76 Pascals in the International System of Units.
kPa (kilopascal) is a metric unit equal to 1,000 Pascals, while PSI (pounds per square inch) is an imperial unit. One kPa equals 0.145038 PSI. kPa is commonly used in tire pressure specifications outside the US, while PSI is standard in American automotive and industrial applications.
PSI remains popular in the United States and some industries because of historical precedent and familiarity. Many tools, gauges, and specifications were designed using PSI. Additionally, PSI provides convenient numbers for common applications—tire pressure is typically 30-35 PSI, which is easier to work with than 206,843-241,317 Pascals.
Typical car tire pressure of 32 PSI equals approximately 220,632 Pascals or 220.6 kPa. This is why tire pressure is often listed in both PSI and kPa on modern vehicles. For example, you might see a recommendation of "32 PSI (220 kPa)" on your vehicle's door jamb sticker.
Pascal is a relatively small unit of pressure. One Pascal is the pressure exerted by one Newton of force over one square meter, which is about the pressure of a dollar bill resting on a table. For practical applications, kilopascals (kPa) or megapascals (MPa) are more commonly used to avoid dealing with very large numbers.
Yes, this converter works for both positive and negative (vacuum) pressures. Vacuum is typically measured as pressure below atmospheric. For example, -14.7 PSI represents a perfect vacuum (0 absolute pressure), which equals -101,325 Pascals. However, vacuum is often expressed in positive numbers relative to perfect vacuum.