Convert between ksi (kilopounds per square inch) and psi in either direction — common in materials-engineering strength specifications.
How it works
“Kilo” means exactly 1,000, so 1 ksi = 1,000 psi. Enter a value in either field and the other updates instantly.
What this does not include
This is a plain unit conversion. It doesn’t evaluate whether a given stress value is safe for a specific material or application, which depends on that material’s actual strength ratings.
How to use this calculator
- Enter a value in ksi or psi.
- The other field updates automatically.
Why use ksi instead of psi for material strength?
Tensile and yield strength values for metals are often in the tens of thousands of psi, so ksi keeps the numbers smaller and easier to work with — structural steel, for example, is commonly rated around 36 to 50 ksi yield strength.
Is ksi used outside the US?
Rarely — it’s primarily a US customary unit; most other countries use megapascals (MPa) for the same kind of material strength specification.
How does ksi relate to MPa?
1 ksi is about 6.895 MPa, following from the same psi-to-pascal relationship this site’s MPa-to-PSI calculator uses, scaled by the factor of 1,000 between ksi and psi.
