Kilopascal to PSI Converter
Our free force pressure & torque converter handles kilo pascal psiconverter conversions. See tables, ratios, and examples for quick reference.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Kilopascal to PSI Converter
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Formula: PSI = kPa x 0.145038
Worked example โ 240 kPa = 34.8091 PSI = 2.40 bar
Formula
PSI = kPa x 0.145038
Multiply kilopascals by 0.145038 to get PSI. To convert PSI to kPa, multiply by 6.89476. For bar, divide kPa by 100. For atmospheres, divide kPa by 101.325. For mmHg, multiply kPa by 7.50062.
Worked Examples
Example 1: Converting Tire Pressure
Problem:A tire placard says 240 kPa. What is that in PSI?
Solution:PSI = kPa x 0.145038 PSI = 240 x 0.145038 = 34.8091 PSI bar = 240 / 100 = 2.4000 bar atm = 240 / 101.325 = 2.3686 atm
Result:240 kPa = 34.8091 PSI = 2.40 bar
Example 2: Converting Water Pressure
Problem:A pressure gauge reads 55 PSI. Convert to kilopascals.
Solution:kPa = PSI x 6.89476 kPa = 55 x 6.89476 = 379.2118 kPa bar = 379.2118 / 100 = 3.7921 bar atm = 379.2118 / 101.325 = 3.7425 atm
Result:55 PSI = 379.2118 kPa = 3.79 bar
Frequently Asked Questions
What is the conversion factor from kilopascals to PSI?
One kilopascal equals 0.145038 pounds per square inch (PSI). Conversely, one PSI equals 6.89476 kilopascals. The pascal is the SI unit of pressure defined as one newton per square meter, so a kilopascal is 1,000 pascals. PSI is defined as one pound-force applied over one square inch of area. These conversion factors are exact to six significant figures and are used internationally in engineering, automotive, and industrial applications.
Why do some countries use kPa and others use PSI?
Countries that adopted the metric system use kilopascals as their standard pressure unit because the pascal is the SI unit of pressure. The United States, along with a few other countries still using imperial measurements, primarily uses PSI. In the automotive industry, tire pressure is listed in kPa in most of the world but in PSI in North America. Many pressure gauges are dual-labeled with both units to accommodate international standards and make it easier for users across different regions.
What are common pressure values in kPa and PSI?
Standard atmospheric pressure at sea level is 101.325 kPa or 14.696 PSI. A typical car tire pressure of 32 PSI equals about 220.6 kPa. A bicycle road tire at 100 PSI is approximately 689.5 kPa. Household water pressure usually runs between 275-550 kPa (40-80 PSI). Scuba tanks are filled to about 20,684 kPa (3,000 PSI). These reference values are helpful for quickly checking whether a conversion result is in the right ballpark.
How does kPa relate to other metric pressure units like bar and atmosphere?
One bar equals exactly 100 kPa, making that conversion very simple. One standard atmosphere (atm) equals 101.325 kPa. One megapascal (MPa) equals 1,000 kPa. The hectopascal (hPa), used in meteorology, equals 0.1 kPa. In medical applications, millimeters of mercury (mmHg) are common where 1 kPa equals 7.50062 mmHg. Understanding these relationships helps when working across different fields that prefer different pressure units.
Is gauge pressure different from absolute pressure?
Yes, and this distinction is critical for accurate conversions. Gauge pressure (psig or kPa gauge) measures pressure relative to atmospheric pressure, meaning a reading of zero indicates atmospheric pressure. Absolute pressure (psia or kPa absolute) measures from a perfect vacuum, so atmospheric pressure reads as 101.325 kPa or 14.696 psi. When converting between kPa and PSI, ensure both values use the same reference point. Tire pressure gauges, for example, always show gauge pressure.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator ยท Editorial policy
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