Material strengths in U.S. specifications are given in ksi (thousands of psi); international standards use MPa. ASTM A36 steel’s 36 ksi yield strength is about 248 MPa.
How to use the ksi to MPa Converter
- Type the number of ksi into the Ksi field. Decimals such as 18 are fine.
- Read the answer in Megapascals – it updates as you type, with no button to press.
- To convert the other way, type into Megapascals and the ksi are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only ksi ⇄ MPa. Need a different unit? Use the general pressure converter, where you can choose any “from” and “to” unit.
How it works
Both units measure pressure, so they are always in the same ratio: one kilopound per square inch equals 6.8947573 megapascals. The calculator multiplies the number of ksi you type by 6.8947573 to give megapascals, and when you type into the megapascals field it divides by the same factor to give ksi. Because the ratio never changes, doubling the ksi always doubles the megapascals. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert ksi to megapascals
- Write down the value in ksi, for example 36 ksi.
- Multiply by the conversion factor 6.8947573 (because 1 kilopound per square inch = 6.8947573 MPa).
- 36 × 6.8947573 = 248.21126 MPa.
- To go back from megapascals to ksi, divide by 6.8947573 – or multiply by 0.14503774.
ksi to MPa conversion table
| Ksi | Megapascals | Megapascals | Ksi |
|---|---|---|---|
| 1 ksi | 6.8947573 MPa | 1 MPa | 0.14503774 ksi |
| 10 ksi | 68.947573 MPa | 2 MPa | 0.29007548 ksi |
| 30 ksi | 206.84272 MPa | 5 MPa | 0.72518869 ksi |
| 36 ksi | 248.21126 MPa | 10 MPa | 1.4503774 ksi |
| 50 ksi | 344.73786 MPa | 20 MPa | 2.9007548 ksi |
| 60 ksi | 413.68544 MPa | 50 MPa | 7.2518869 ksi |
| 65 ksi | 448.15922 MPa | 100 MPa | 14.503774 ksi |
| 100 ksi | 689.47573 MPa | 1,000 MPa | 145.03774 ksi |
| 150 ksi | 1,034.2136 MPa |
What is a kilopound per square inch?
A ksi is 1,000 psi. U.S. engineers use it for material strengths, such as 36 ksi structural steel or 4 ksi concrete.
What is a megapascal?
A megapascal is one million pascals, the same as one newton per square millimetre. Material strengths and hydraulic pressures are given in MPa.
Quick mental conversion
For a fast estimate, multiply ksi by about 6.9 to get megapascals; the error is about 0.1%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Mixing gauge pressure (psig, barg) with absolute pressure (psia, bara), treating bar and atm as identical, and confusing kgf/cm² with bar.
Formula
1 ksi = 6.8947573 MPa1 MPa = 0.14503774 ksiMPa = ksi × 6.8947573Worked example
Inputs — Ksi: 36 ksi.
Results — Megapascals = 248.21126255 MPa.
Frequently asked questions
How many MPa is 1 ksi?
About 6.895 MPa.
How many ksi is 250 MPa?
About 36.3 ksi.
How do I convert ksi to megapascals?
Multiply the number of ksi by 6.8947573. For example, 36 ksi × 6.8947573 = 248.21126 MPa.
How do I convert megapascals back to ksi?
Divide by 6.8947573 (or multiply by 0.14503774), or simply type the value into the megapascals field above.
What is 10 ksi in megapascals?
10 ksi = 68.947573 MPa.
What is 100 ksi in megapascals?
100 ksi = 689.47573 MPa.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between ksi and megapascals. To pick any pressure unit, use the general pressure converter linked under Related calculators.
What formula does the ksi to MPa Converter use?
1 ksi = 6.8947573 MPa.