Get Free Stiffness PDF for Download today. Examples are included after each Formula with a link to a live Calculator! All the Formulas and Calculators support Unit Conversion as well. This PDF features 10 calculators from Strength of Materials. Inside, you'll discover a list of formulas such as Stiffness of Spring, Diameter of Spring Wire or Coil given Stiffness of Spring and 10 more formulas!. The Variables, Functions and Constants are summarized at the end. Explore and share Stiffness PDFs!