Maker & Reference
Wire Rope / Cable Sag Calculator
Cable sag matters for clotheslines, zip lines, suspension bridges, and overhead utility runs. More tension = less sag but more load on anchors.
Sag at midspan
—
- Cable length needed
- —
- Anchor tension
- —
- Sag % of span
- —
FAQ
Why sag matters? +
For overhead utility lines, sag changes with temperature (more sag in summer). For zip lines, sag determines speed and clearance. Sag < 5% feels tight.
Reducing sag? +
More tension (smaller sag but bigger anchor load). Lighter cable. Shorter span. Pretensioning above expected service load.