Hammock Hang Calculator
Achieve the legendary 30-degree hang with comfortable sag by measuring your setup and letting the math do the rest.
Typically 18″ (chair height) so your feet touch the ground.
30° is the sweet spot—adjust for preference or shorter spans.
Hang Specs
Anchor height
5.25 ft
Hang straps around this height on each tree.
Suspension length
7.51 ft
Distance from tree to hammock end per side.
Sag / ridgeline
Sag 21.4 in • RL 8.72 ft
Maintain comfort with 83% ridgeline ratio.
How to Use This Calculator
Measure anchor distance
Pace or tape-measure the distance between trees or posts. Aim for 12–18 ft for gathered-end hammocks.
Enter hammock length
Measure from end to end when laid flat (including loops). Gathered-end lengths vary from 9–11 ft.
Set preferred seat height
18″ mimics a chair. Lower heights feel more lounge-like; higher requires longer straps or stands.
Formula
Anchor Height ≈ Seat Height/12 + tan(Angle) × (Distance/2)
Suspension Length ≈ √[(Distance/2)² + (tan(Angle) × Distance/2)²]
Ridgeline = Hammock Length × 0.83
Example: Trees 13 ft apart, hammock 10.5 ft, seat 18″, angle 30° → Anchor ≈ 5.5 ft, suspension ≈ 6.5 ft per side, ridgeline ≈ 8.7 ft.
Hammock Hang Tips
A comfortable hang balances sag, height, and angle. Use straps (not rope) to protect trees and always check for widowmakers overhead.
- Use 30° hang angle to minimize shoulder squeeze and keep pressure off the trees.
- Diagonal lay increases comfort—hang ridgeline taut but not guitar-string tight.
- Carry extra strap length for wider trees or in case anchor height isn’t adjustable.
- In cold weather, add underquilts or insulation since airflow under the hammock cools you quickly.
Frequently Asked Questions
What if trees are too far apart?
Increase strap length and climb higher on the tree to maintain the seat height. Watch for steep strap angles that stress gear.
Can I use stands or indoors?
Yes—measure anchor distance the same way. Ensure stands are rated for your weight and the hang angle.
Does weight affect the math?
Heavier hangers may experience more sag; adjust by tightening suspension slightly or raising anchor points.
What is ridgeline length for?
A ridgeline maintains consistent sag regardless of tree distance. 83% of hammock length is the standard starting point.