Hammock Hang Calculator
Find the right hanging height and distance for a comfortable 30-degree hammock hang.
Last updated · View algorithm, constants and default inputs (JSON)
Anchor height for this distance (ft)
Dots show recalculated samples. Other inputs stay fixed.
About this calculator
A 30° hang angle and a ridgeline near 83% of hammock length are common rules of thumb, not universal comfort or safety standards. Actual setup depends on hammock design, suspension, anchor spacing, and load. Follow manufacturer instructions and use properly rated anchors.
Worked example
calculated with the default values below
Hammock length 10 ft · Desired hang angle 30 ° · Desired seat height 18 in · Distance between anchor points 14 ft Anchor height for this distance 5.54 ft · Suggested structural ridgeline 8.30 ft · Sag below the anchor line 48.5 in · Hang check Angle is in the comfortable 25-35° range
General background references
Disclaimer
These calculators provide planning estimates only. Building codes, wiring regulations and safety requirements differ by country and change over time, and nothing here replaces a licensed professional or a permit. For structural, electrical or gas work, follow local code and have the installation inspected.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
H = (D ÷ 2) × tan θ + S ÷ 12
- D
- Distance between anchors, ft
- θ
- Hang angle from horizontal, degrees
- S
- Seat height above ground, in
- H
- Approximate anchor height, ft
The model assumes level ground and equal anchor heights; sag at each end is (D ÷ 2) × tan θ. Comfortable hang angle is commonly around 25–35°; ridgeline ≈ 0.83 × hammock length.
Frequently asked questions
Why does the suggested ridgeline stay at 83 percent of the hammock length?
The 83% ridgeline ratio is a common rule of thumb for some gathered-end hammocks, not a universal comfort or safety standard. Follow your hammock maker’s guidance; the calculator does not verify anchors or suspension for your load.
Why is the anchor height based on half the anchor distance?
The hammock midpoint is below both end points. With level anchors, the vertical rise at each end is approximately half the anchor spacing multiplied by tan(angle from horizontal), plus your chosen sitting height. This is a planning estimate; follow the hammock maker’s setup guidance and use anchors rated for the load.