Hammock Ridgeline Length Calculator
Calculate the structural ridgeline length for a camping hammock to set a repeatable, comfortable sag.
How it works
ridgeline = hammock length × ratio (≈ 83%)
A structural ridgeline is a fixed line between the two gathered ends that forces the same sag every time regardless of how the hammock is hung. The line is cut shorter than the hammock — about 83% of its length is the classic starting point — which produces the roughly 30° hang angle that gives a comfortable, flat diagonal lay. Shortening the ratio deepens the sag; lengthening it flattens the lay but makes the hammock feel tighter.
Worked example
For a 132-inch hammock at the standard 83% ratio: 132 × 0.83 = 109.6 in ≈ 9.13 ft of ridgeline. Dropping to 80% (105.6 in) gives a deeper, more cocooned sag.
Frequently asked questions
What does a ridgeline do?
It fixes the distance between the hammock’s ends, so you get the same sag and lay angle no matter how far apart or how high your anchor points are. It also gives you a place to hang gear.
Why 83%?
That ratio reproduces the ~30° hang angle most people find comfortable, letting you lie on a flat diagonal. It is a starting point — adjust a few percent to taste.
Structural vs continuous ridgeline?
A structural ridgeline is load-bearing and sets the sag. A continuous ridgeline is a separate line for hanging a tarp and does not affect the hammock’s lay.
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This calculator is for educational purposes. Double-check important results before acting on them.