ksi to MPa Converter
Convert kilopounds per square inch (ksi) to megapascals (MPa) and back, live. Also converts psi, kPa, GPa and Pa. Built for engineers converting steel and aluminum strength values.
ksi to MPa Calculator
ksi to MPa Conversion Chart
This ksi to MPa chart lists common ksi values converted to MPa (exact factor 6.894757293168). Click any row to load it into the calculator.
| ksi | MPa | Common use |
|---|
ksi to MPa in Material Strength
The number one reason people convert ksi to MPa is material strength. US datasheets list yield and tensile strength in ksi; metric datasheets use MPa. Same property, different unit.
Typical Material Strengths: ksi and MPa
Typical values for comparison. Actual properties vary by heat, temper and specification; always use the certified datasheet for design.
| Material | Yield (ksi) | Yield (MPa) | Tensile (ksi) | Tensile (MPa) |
|---|---|---|---|---|
| A36 structural steel | 36 | 248.21 | 58-80 | 399.90-551.58 |
| A572 Grade 50 steel | 50 | 344.74 | 65 | 448.16 |
| 6061-T6 aluminum | 35 | 241.32 | 45 | 310.26 |
| 7075-T6 aluminum | 73 | 503.32 | 83 | 572.26 |
| Ti-6Al-4V titanium | 128 | 882.53 | 138 | 951.48 |
| 304 stainless steel | 30 | 206.84 | 75 | 517.11 |
Worked Examples
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Frequently Asked Questions
What is the ksi to MPa conversion factor?
The exact ksi to MPa conversion factor is 6.894757293168. One ksi equals 1000 psi, and one psi equals exactly 6.894757293168 kPa, so one ksi equals exactly 6.894757293168 MPa. For most engineering work, multiplying by 6.89476 gives all the precision you need.
What is the formula to convert ksi to MPa?
The ksi to MPa formula is: MPa = ksi x 6.894757293168. To go the other direction, use: ksi = MPa / 6.894757293168 (equivalently, ksi = MPa x 0.1450377377). Example: 36 ksi x 6.894757293168 = 248.2113 MPa.
How do I convert MPa to ksi?
To convert MPa to ksi, divide the MPa value by 6.894757293168, or multiply it by 0.1450377377. Example: 690 MPa / 6.894757293168 = 100.076 ksi. The converter above does this automatically when you type in the MPa field.
What is 1 ksi in MPa?
1 ksi equals exactly 6.894757293168 MPa, usually rounded to 6.895 MPa. Since 1 ksi is 1000 psi and 1 psi is 6.894757293168 kPa, the result follows directly from those two definitions.
What is 10 ksi in MPa?
10 ksi equals 68.94757293168 MPa, usually rounded to 68.95 MPa. Multiply: 10 x 6.894757293168 = 68.94757293168 MPa.
What is 50 ksi in MPa?
50 ksi equals 344.7378646584 MPa, usually rounded to 344.74 MPa. This is a common number in structural steel: A572 Grade 50 steel has a minimum yield strength of 50 ksi (344.74 MPa).
What is 100 ksi in MPa?
100 ksi equals 689.4757293168 MPa, usually rounded to 689.48 MPa. Multiply: 100 x 6.894757293168 = 689.4757293168 MPa.
Why is ksi used for steel strength in the US?
US steel specifications (ASTM, AISC) traditionally report yield and tensile strength in ksi because the numbers are convenient: structural steels yield at 36 to 100 ksi, easy two-digit values. Metric specifications use MPa, where the same steels are 248 to 690 MPa. Both describe the same physical quantity, so this converter translates between the two conventions.
What does ksi stand for?
ksi stands for kilopound per square inch. It is a US customary unit of pressure and stress equal to 1000 pounds-force per square inch (1000 psi). It is used mainly for material strengths, such as the yield strength of steel.
How many psi is 1 ksi?
1 ksi equals exactly 1000 psi. The 'k' in ksi is the metric-style prefix kilo, so one kilopound per square inch is one thousand pounds per square inch. In MPa, 1000 psi is 6.894757293168 MPa.
What is 36 ksi in MPa?
36 ksi equals 248.211262554048 MPa, usually rounded to 248.21 MPa or 248 MPa. This is the minimum specified yield strength of A36 structural steel, one of the most common conversions in structural engineering: 36 x 6.894757293168 = 248.211262554048 MPa.
How do I convert tensile strength from ksi to MPa?
Tensile strength converts exactly like any other pressure or stress value: multiply the ksi value by 6.894757293168. For example, 6061-T6 aluminum has an ultimate tensile strength of about 45 ksi, which is 45 x 6.894757293168 = 310.26 MPa. Yield strength uses the same factor.
Is yield strength reported in ksi or MPa?
Both. US specifications such as ASTM A36 list yield strength in ksi (36 ksi), while metric and international specifications list it in MPa (248 MPa). They are the same quantity in different units, related by the exact factor 6.894757293168. Always check which unit a datasheet uses before comparing materials.
Is 1 MPa equal to 1 N per mm2?
Yes. 1 MPa equals exactly 1 newton per square millimeter (1 N/mm2). This is a useful cross-check: 36 ksi = 248.21 MPa = 248.21 N/mm2. So 1 ksi = 6.894757293168 N/mm2 as well.
How many decimal places should I use for ksi to MPa?
The conversion factor 6.894757293168 carries 13 significant digits, far more than material data supports. For engineering calculations, 4 to 6 significant digits (for example 6.8948 or 6.89476) are plenty, since reported strengths are typically given to 2 or 3 significant digits. This converter lets you set 0 to 10 decimals to match your datasheet.
Can I convert GPa to ksi?
Yes. 1 GPa equals 1000 MPa, so 1 GPa = 1000 / 6.894757293168 = 145.0377377 ksi. This is handy for elastic modulus: structural steel has a modulus of about 200 GPa, which is 200 x 145.0377377 = 29007.5 ksi (commonly quoted as 29000 ksi).
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