Sources and scope for this page: Industry convention — no single governing standard (conventional usage, definitions vary between sources), covering the definition of ksi / ksc. No independent source check is recorded for this page: the content rests on the sources listed and on the working shown on the page. How sources, methods and updates are recorded.
Definition
ksi is 1,000 psi, not a different unit. Steel yield strengths in ksi are common because the numbers are manageable — 36 ksi rather than 36,000 psi.
Convert to MPa by multiplying by 6.894757. The reverse, MPa to ksi, is 0.1450377.
Common misuse
Confusing ksi with kip per square inch or with kg/cm². All three are pressure units with different magnitudes.