Convert tensile strength between MPa, ksi, N/mm² and kgf/mm². 1 ksi = 6.895 N/mm². Use it to compare material specs written to ASTM, ISO, EN and JIS standards on the same footing.
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Request a Proposal →Tensile strength (ultimate tensile strength, UTS) is the maximum stress a material can withstand while being stretched before necking. Different standards use different units -- MPa (ISO), ksi (ASTM), N/mm2 (EN), kgf/mm2 (JIS).
| Input | Converted value |
|---|---|
| 30 ksi | 206.8 N/mm2 (MPa) |
| 60 ksi | 413.7 N/mm2 (MPa) |
| 80 ksi | 551.6 N/mm2 (MPa) |
| 100 ksi | 689.5 N/mm2 (MPa) |
| 120 ksi | 827.4 N/mm2 (MPa) |
| 150 ksi | 1034.2 N/mm2 (MPa) |
| 180 ksi | 1241.1 N/mm2 (MPa) |
| 200 ksi | 1379.0 N/mm2 (MPa) |
| 300 N/mm2 | 43.51 ksi |
| 400 N/mm2 | 58.02 ksi |
| 500 N/mm2 | 72.52 ksi |
| 600 N/mm2 | 87.02 ksi |
| 700 N/mm2 | 101.53 ksi |
| 800 N/mm2 | 116.03 ksi |
| 900 N/mm2 | 130.53 ksi |
| 1000 N/mm2 | 145.04 ksi |
| 1200 N/mm2 | 174.05 ksi |
Mild steel (1018): 440 MPa / 64 ksi. Medium carbon (1045): 565-670 MPa / 82-97 ksi. Alloy steel (4140 Q&T): 900-1100 MPa / 130-160 ksi. Tool steel (D2 hardened): up to 2000 MPa / 290 ksi. Inconel 718: 1275 MPa / 185 ksi. Titanium Grade 5: 950 MPa / 138 ksi.
Tensile strength (UTS) is the stress at which the material breaks. Yield strength is the stress at which permanent deformation begins (typically 0.2% offset). Most designs use yield strength with a safety factor. The UTS/yield ratio indicates ductility -- brittle materials have UTS close to yield.
ksi = kips per square inch. 1 kip = 1000 pounds-force. 1 ksi = 1000 psi. This is the standard unit for tensile strength in ASTM and North American specifications. Steel at 100 ksi UTS is roughly equivalent to 690 MPa.
Enter a value in any of the supported units. The converter shows equivalents in MPa, ksi, N/mm2, and kgf/mm2. Use this to compare material certificates and specifications across different standards and convert tooling catalog values to your preferred unit system.
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