Ksi to Mpa

Structural Mechanics & ASTM / AISC Standards

The unit ksi represents kips per square inch. In the SI metric system, stress is measured in Megapascals (MPa), which is mathematically identical to Newtons per square millimeter.

Primary Structural Engineering Material Yield Strengths

• ASTM A36 Carbon Steel: 36 ksi = 248.21 MPa = 36,000 psi

• Grade 50 Structural Steel: 50 ksi = 344.74 MPa = 50,000 psi

• Grade 60 Concrete Rebar: 60 ksi = 413.69 MPa = 60,000 psi

• 6061-T6 Aluminum: 40 ksi = 275.79 MPa = 40,000 psi

• Grade 5 Titanium (Ti-6Al-4V): 120 ksi = 827.37 MPa

• 4,000 psi Structural Concrete: 4 ksi = 27.58 MPa

Equations

• MPa = ksi × 6.894757293

• ksi = MPa × 0.145037738

How to Use This Calculator

Enter your Stress / Yield Strength Value (e.g. 50.0), Material Benchmark Preset — choose from Custom Stress Value, ASTM A36 Carbon Steel (36 ksi / 248.2 MPa), Grade 50 Structural Steel (50 ksi / 344.7 MPa), and Conversion Direction — choose from ksi to MPa (ksi → MPa / multiply by 6.895), MPa to ksi (MPa → ksi / divide by 6.895). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Conversion factors used in this calculator:

1 ksi = 1,000 psi

Worked Example

A standard structural wide-flange I-beam specified with ASTM A992 / Grade 50 steel has a nominal yield strength of 50 ksi, equivalent to 344.74 MPa in European Eurocode structural design.

Understanding Your Result

Unit conversion precision: round to the same number of significant figures as your original measurement. Converting 6 feet to meters gives 1.8288 m — but if your measurement was approximate (±1 inch), expressing more than 2 decimal places is false precision. For international trade and technical specifications, SI units (meters, kilograms, liters) are the standard. US customary units (feet, pounds, gallons) differ from Imperial UK units: 1 US gallon = 3.785 L vs. 1 UK gallon = 4.546 L.