// multi-utility computation suite · offline · instant · precise
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eng.cable-sag Calculator
Calculates catenary cable sag, tension, and horizontal force from span length, cable weight per unit length, and allowable tension. Suspension cable sag is approximately parabolic for evenly distributed loads — the sag-to-span ratio affects both aesthetics and structural forces.
Inputs
Span
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Load
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Tension
Reference formula or conversion factor shown for context.
Weight
Body or object weight. For health calculators, usually in kg or lbs.
Results
midpoint sag (m)
Sample size or count used in the calculation.
max tension (kN)
The tensile force or stress — the pulling force that stretches the material. Must stay below the material's tensile strength.
horizontal tension (kN)
The tensile force or stress — the pulling force that stretches the material. Must stay below the material's tensile strength.
cable length (m)
The computed linear length.
sag/span ratio
The proportional relationship between two quantities.