KSI to MPa Converter
Convert kip per square inch (ksi) to megapascals (MPa) instantly — the exact stress conversion engineers need.
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How to convert KSI to MPa
KSI (kip per square inch, i.e. 1000 psi) is common in US structural and mechanical engineering for yield and tensile strength; MPa (megapascals) is the SI equivalent used almost everywhere else. To convert, multiply the value in ksi by 6.894757293168 — derived from the pound-force (4.4482216152605 N) divided by one square inch (0.00064516 m²), carried to full precision.
Worked example: checking a steel section against two codes
A US design spec calls for A992 structural steel with a minimum yield strength of 50 ksi. A project's governing code is written in Eurocode terms, which specifies steel grades by MPa. Entering 50 into the calculator above gives 344.74 MPa — close to, and typically cross-referenced with, S355 grade steel (355 MPa nominal yield) in European practice, though the two aren't a direct drop-in substitute since grade boundaries don't align exactly across standards.
Common mistake: confusing ksi with kPa
The abbreviations look similar but represent vastly different magnitudes — 1 ksi ≈ 6,895,000 Pa, while 1 kPa = 1,000 Pa, a factor of nearly 7,000 apart. Misreading a spec sheet's "ksi" as "kPa" (or vice versa) is a documented source of real design errors; always check the unit symbol carefully, especially on scanned or OCR'd older drawings where formatting can be lost.
Quick reference — common material strengths
| KSI | MPa |
|---|---|
| 1 ksi | 6.895 MPa |
| 36 ksi (mild steel yield, A36) | 248.2 MPa |
| 50 ksi (A992 steel yield) | 344.7 MPa |
| 60 ksi (rebar Grade 60) | 413.7 MPa |
| 100 ksi | 689.5 MPa |
Need MPa to psi, GPa, bar or atm instead? Select "Pressure / Stress" above — all engineering pressure units are in one dropdown.
How to use the converter
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Frequently asked questions
What is 1 ksi in MPa?
1 ksi equals exactly 6.894757293168 MPa.
What is KSI used for?
KSI (kip per square inch) is widely used in US engineering codes to express tensile, yield and compressive strength of materials such as steel and concrete reinforcement.
Is ksi the same as psi?
No — 1 ksi = 1,000 psi. Both are Imperial pressure/stress units; ksi is simply a more convenient scale for the high stresses seen in structural steel.
Why do US codes use ksi instead of psi for steel design?
Structural steel stresses typically run from the tens of thousands to low hundreds of thousands of psi, so expressing them in ksi keeps the numbers in a more readable range (tens to low hundreds) — similar to why pressures are given in kPa or MPa rather than plain pascals.
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