Wire Sag and Tension Calculator

Click on the Calculate button in the table below, and a graph will appear for 3 cable examples.  Click the buttons to increase or decrease the Catenary Coefficient, C.

Use any consistent units for length and weight,  e.g.  feet and pounds to enter cable parameters, span, height, etc, and update the graph with the Calculate button.

The Wolfram Formula Repository has good calculator pages for spot checking the numbers.  See the page for Level Span Catenary Sag here and the page for Inclined Span Catenary Sag here .