PSI to ksi Converter
Enter the pressure in psi below to convert it to ksi.
Convert PSI to ksi
Enter a value in psi (psi) to convert to ksi (ksi).
Pounds per Square Inch to Kilopounds per Square Inch Conversion Table
Table showing various pounds per square inch measurements converted to ksi. Click any preset value or arrow to load it into the converter.
How to Convert PSI to ksi
To convert psi to ksi, multiply the pressure by the following conversion ratio: 0.001 ksi/pounds per square inch.
Since one pounds per square inch is equal to 0.001 ksi, you can use this simple formula to convert:
The pressure in ksi is equal to the pressure in psi multiplied by 0.001.
For example, here's how to convert 5 psi to ksi using the formula above.
How Many ksi Are in a Pounds per Square Inch?
There are 0.001 ksi in a pounds per square inch, which is why we use this value in the formula above.
Our pounds per square inch to kilopounds per square inch calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
PSI and ksi are both units used to measure pressure. Keep reading to learn more about each unit.
What Is a Pounds per Square Inch?
A pounds per square inch is a unit of pressure equal to 6,894.7572932 pascals (Pa), the base unit for pressure. Imperial & US pressure unit equal to 1 pound-force per square inch (6.89476 kPa). [1]
The pounds per square inch is classified as a US customary and imperial unit of pressure. PSI can be abbreviated as psi; for example, 1 pounds per square inch can be written as 1 psi.
When working with psi (psi) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, psi (psi) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Kilopounds per Square Inch?
A kilopounds per square inch is a unit of pressure equal to 6,894,757.293168 pascals (Pa), the base unit for pressure. Materials engineering yield strength unit equal to 1,000 PSI (6.89476 MPa). [2]
The kilopounds per square inch is classified as a US customary unit of pressure. ksi can be abbreviated as ksi; for example, 1 kilopounds per square inch can be written as 1 ksi.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilopounds per square inch (ksi) a convenient decimal multiple of the pascal (Pa).
In practice, ksi (ksi) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within US customary workflows, engineering documentation, and technical data sheets.
When converting pressure between psi (psi) and ksi (ksi), keep full floating-point precision (1 psi = 0.001 ksi; 1 ksi = 1,000 psi) during intermediate calculations and round only the final kilopounds per square inch figure to match your instrument tolerance.
More Pounds per Square Inch & Kilopounds per Square Inch Conversions
Need to calculate in the opposite direction? Use our ksi to psi converter (ksi to psi) to switch your starting unit immediately. You can also explore related tools such as converting megapascals to ksi, converting psi to bars, or converting psi to kilopascals.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — PSI (psi) to ksi (ksi)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Pounds per Square Inch (psi) & Kilopounds per Square Inch (ksi) (ksi)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (psi to ksi)