Cable Length Calculator

Use this calculator to accurately calculate the length of a cable or conductor.

This online calculator assists in determining the length of a cable or conductor, taking into account the sag that naturally occurs in cables. When a cable is suspended between two points, it typically forms a parabolic shape due to its flexibility. As a result, the cable length between the two points will be greater than the original distance. This calculator uses the cable span and sag to calculate the cable or conductor length.

Cable Span
Cable Sag
Result unit
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    5 Number of calculations
    L = S + \frac{8d^2}{3S}


    • L = Cable Length
    • S = Cable Span
    • d = Cable Sag