KSI to MPa Converter
Convert kilopounds per square inch (ksi) to megapascals (MPa) with precision. This converter handles stress and pressure conversions commonly used in structural engineering, materials testing, and construction projects across the UK.
Quick Conversions
KSI to MPa Conversion Table
Common ksi values and their megapascal equivalents for engineering specifications and material properties.
| Kilopounds per Square Inch (ksi) | Megapascals (MPa) |
|---|---|
| 0.5 ksi | 3.447 MPa |
| 1 ksi | 6.895 MPa |
| 2 ksi | 13.790 MPa |
| 5 ksi | 34.474 MPa |
| 10 ksi | 68.948 MPa |
| 15 ksi | 103.421 MPa |
| 20 ksi | 137.895 MPa |
| 25 ksi | 172.369 MPa |
| 30 ksi | 206.843 MPa |
| 40 ksi | 275.790 MPa |
| 50 ksi | 344.738 MPa |
| 60 ksi | 413.686 MPa |
| 75 ksi | 517.107 MPa |
| 100 ksi | 689.476 MPa |
| 150 ksi | 1034.214 MPa |
| 200 ksi | 1378.951 MPa |
Conversion Formula and Steps
The relationship between ksi and MPa follows a direct multiplication. Each kilopound per square inch equals 6.894757 megapascals.
How to Convert KSI to MPa
- Take your pressure or stress value in kilopounds per square inch.
- Multiply the ksi value by 6.894757.
- The result gives you the equivalent pressure in megapascals.
- Round to the appropriate decimal places for your application.
Example: Converting 36 ksi to MPa
36 ksi × 6.894757 = 248.211 MPa
This means steel rated at 36 ksi yield strength has a yield strength of approximately 248 MPa.
How to Convert MPa to KSI
- Start with your pressure value in megapascals.
- Divide the MPa value by 6.894757.
- You now have the equivalent in kilopounds per square inch.
- Round as needed for your engineering specifications.
Example: Converting 400 MPa to ksi
400 MPa ÷ 6.894757 = 58.015 ksi
About These Pressure Units
What is KSI?
KSI stands for kilopounds per square inch. One kip equals 1,000 pounds-force, making ksi particularly useful for expressing high stress values in American engineering practice. You’ll find ksi specifications throughout structural steel documentation, concrete testing reports, and material data sheets for metals.
British engineers working with US standards encounter ksi in bridge specifications, building codes, and imported steel certifications. It’s the standard unit in ASTM testing procedures and American welding specifications.
What is MPa?
The megapascal represents one million pascals and serves as the SI unit for pressure and stress. UK engineering firms use MPa in Eurocodes, material testing, and most modern construction projects. One MPa equals one newton per square millimetre (N/mm²).
MPa appears in British Standards, concrete cube test results, steel specifications, and geotechnical reports. It’s the preferred unit for international projects and scientific publications.
Where You’ll Use These Conversions
British engineers need ksi to MPa conversions when reviewing American steel grades or working with international suppliers. A36 steel (36 ksi yield) converts to 248 MPa, whilst Grade 50 steel (50 ksi) equals 345 MPa.
Concrete testing in the UK uses MPa for cube strength, but some older specifications reference psi. High-strength concrete at 60 MPa equals roughly 8.7 ksi. Structural engineers converting between British and American codes need these conversions daily.
Typical Values:
- Mild steel: 36 ksi (248 MPa) yield strength
- High-strength structural steel: 50-60 ksi (345-414 MPa)
- Construction concrete: 4-6 ksi (28-41 MPa) compressive strength
- Aluminium alloys: 10-80 ksi (69-552 MPa) depending on grade
Units of Pressure Conversions
Pressure and stress measurements use various units across different industries and regions. Here are the most common conversions you might need alongside ksi and MPa.
| From | To | Multiply By |
|---|---|---|
| ksi | MPa | 6.894757 |
| ksi | psi | 1,000 |
| ksi | bar | 68.94757 |
| MPa | ksi | 0.145038 |
| MPa | psi | 145.038 |
| MPa | bar | 10 |
| MPa | N/mm² | 1 |
| psi | kPa | 6.894757 |
| bar | MPa | 0.1 |
| bar | psi | 14.5038 |
FAQs
1 ksi equals 6.894757 MPa. This conversion factor comes from the relationship between pounds-force, square inches, newtons, and square metres in their respective measurement systems.
Historical measurement systems created this divide. The United States continues using imperial units including pounds and inches, whilst the UK adopted SI units like pascals decades ago. International engineering projects require conversions between both systems.
KSI measures pressure in kilopounds per square inch, whilst psi uses pounds per square inch. One ksi equals exactly 1,000 psi. Engineers use ksi for high-stress applications where psi values would become unwieldy large numbers.
Yes, the conversion factor remains constant regardless of whether you’re converting tensile stress, compressive stress, shear stress, or pressure. 6.894757 applies to all ksi to MPa conversions because it’s purely a unit conversion.
Yes, one megapascal equals one newton per square millimetre. Both units appear in engineering documentation, but MPa is more common in British specifications whilst N/mm² appears frequently in European standards.
Engineering specifications typically use 2-3 decimal places for MPa values. Material testing reports might show more precision, but practical applications rarely need more than one decimal place. Always follow the precision requirements in your specific design codes.
Common structural steel grades include A36 (36 ksi or 248 MPa minimum yield) and A572 Grade 50 (50 ksi or 345 MPa). Your structural engineer selects the appropriate grade based on load requirements, span lengths, and British or American design codes.
Yes, ksi and MPa measure pressure regardless of the substance. Whether you’re measuring hydraulic pressure in oil, pneumatic pressure in compressed air, or stress in solid materials, the conversion factor stays at 6.894757.