How to Use Hammock Hang Calculator
The Hammock Hang Calculator turns five simple numbers into a safe, comfortable hammock setup. Enter the distance between your anchors, the length of your hammock, the seat height you want, the hang angle and your weight. The Hammock Hang Calculator returns the recommended anchor height for each side, how much the hammock will sag once loaded, the strap length needed per side, and the pull each anchor must resist.
- Choose units — Work in centimetres or inches, kilograms or pounds.
- Enter anchor distance and hammock length — The Hammock Hang Calculator checks that the hammock is longer than the gap.
- Pick a sit height — A common seated height is 45 cm or 18 in.
- Set the hang angle — 30° is recommended; the calculator allows 5°–60° for advanced users.
- Add your weight — Use the heaviest expected occupant for safety.
Formula & Theory - Hammock Hang Calculator
The Hammock Hang Calculator combines simple trigonometry with the standard hammock geometry:
Half Distance = Distance / 2
Sag = Half Distance × tan(angle)
Anchor Height = Sit Height + Sag
Strap per Side = max(0, (Hammock Length - Distance) / 2)
Anchor Tension = Weight / (2 × sin(angle))| Symbol | Meaning |
|---|---|
| Distance | Between the two anchors |
| Hammock Length | End-to-end length of the hammock |
| Sit Height | Where the seat lands once loaded |
| Angle | Angle of the hammock from horizontal at each end |
| Weight | Occupant weight in the chosen unit |
Why 30° is the sweet spot
At 30°, the Hammock Hang Calculator shows tension equal to the occupant weight at each anchor — comfortable and predictable. At 10° tension is almost three times the body weight, and at 5° nearly six times. Most consumer straps are rated for several hundred kilograms, but margins shrink fast at low angles.
Assumptions and Limits
The Hammock Hang Calculator assumes a symmetric hang and ignores strap stretch. Real-world straps stretch a few centimetres under load. Always test a new setup at a low sit height first.
Use Cases for Hammock Hang Calculator
The Hammock Hang Calculator is useful for everyone from backyard loungers to ultralight backpackers:
- Backyard hammocks — Choose tree spacing and strap length before drilling or wrapping.
- Camping and bushcraft — Plan ridgeline and tarp height in tandem with the hammock.
- Indoor setups — Calculate the tension wall anchors must support.
- Yoga and aerial silks rigging — Get a feel for tension scaling with rigging angle.
- Teaching physics — Demonstrate how sine relates rigging angle to load.
By making the geometry visible up front, the Hammock Hang Calculator turns hammock hanging into a relaxing, predictable activity instead of trial-and-error.