Hammock Hang Calculator

Adjust the calculator values below

Distance between anchors Measure horizontally between the two attachment points or anchor centerlines. Preferred sit height The source suggests roughly 16–19 in (40–50 cm) as a chair-height starting range. Occupant plus gear weight Include the person and any meaningful load supported by the hammock. Hang angle from horizontal A 30° suspension angle is a common planning target; shallow angles increase tension sharply. Hammock size input Ridgeline length Distance between the hammock ends when set up; it must be shorter than the anchor spacing. Result length unit Result force unit

Compare with a per-side working load limit Suspension working load limit per side Use the published working load limit for one complete suspension side, not breaking strength.

Required anchor attachment height 5.541 ft

Suspension length per side 2.887 ft

Cord or strap tension per side 175 lbf

Horizontal force per anchor 151.554 lbf

Vertical force per anchor 87.5 lbf

Ridgeline length 9 ft

Modeled hammock body length 10.392 ft

Distance between anchors 14 ft

Horizontal gap per side 2.5 ft

Preferred sit height 1.5 ft

Hang angle 30°

Occupant plus gear weight 175 lb

Entered working load limit 200 lbf per side

Working load utilization 87.5%

Working load margin 25 lbf

Rating comparison Within entered working load limit by 25 lbf per side

Setup model Symmetric suspension with equal-height anchors on level ground

5.541 ft

Required anchor attachment height 14 ft spacing, 9 ft ridgeline, 30° angle, and 18 in sit height

Other Calculator

Hammock Hang Calculator

Estimate hammock anchor height, suspension length, ridgeline geometry, and per-side forces using spacing, sit height, load, and hang angle.

Enter one consistent hammock setup

Use the horizontal anchor spacing, desired sit height, combined occupant and gear weight, suspension angle, and either ridgeline length or modeled hammock body length. The previous circular form exposed derived heights, lengths, and tensions as simultaneous inputs; this workflow derives them from one consistent setup.

Calculate symmetric suspension geometry

The model converts all lengths to a common unit. Ridgeline length equals modeled body length times the cosine of the hang angle. Horizontal gap per side is half the difference between anchor spacing and ridgeline length, suspension length divides that gap by cosine of the angle, and anchor height adds the hammock sag and suspension rise to sit height.

Keep mass and force units distinct

At rest, vertical force per anchor is half the supported weight force. Cord or strap tension per side equals weight force divided by twice the sine of the hang angle, while horizontal force equals weight force divided by twice the tangent. Results are available in pound-force, newtons, or kilogram-force; kilograms and pounds in the load field are converted to weight force using standard gravity.

Treat the rating comparison as only one safety check

The optional comparison uses the entered per-side working load limit, not breaking strength. It does not certify trees, posts, walls, fasteners, straps, knots, hardware, fabric, stitching, ground conditions, installation, dynamic loading, wear, or manufacturer compatibility. Follow every component's instructions, inspect the complete system, protect trees, keep the hammock low, and use qualified advice for structural anchors.

Understand the geometry approximation

The calculator assumes equal-height anchors, level ground, symmetric loading, a static occupant, straight suspension segments, and a simplified V-shaped hammock body. Real fabric follows a curved sag, occupants move, mounting wraps add length, and elastic stretch changes geometry. Confirm the setup gradually at low height before use.

Frequently asked questions

Common questions about hammock hang angle, anchor height, suspension geometry, force units, per-side working load limits, and setup safety.

What hang angle should I use for a hammock?

A 30-degree suspension angle from horizontal is a common planning target. Comfort and the real setup can vary, but very shallow angles increase suspension and anchor forces sharply.

How is required anchor height calculated?

For the symmetric model, anchor height adds the hammock body's modeled sag and the suspension segment's vertical rise to the preferred sit height. The calculation assumes equal-height anchors and level ground.

How is suspension tension calculated?

Static tension in each side equals total supported weight force divided by twice the sine of the hang angle. Vertical force is half the supported weight, and horizontal force equals weight force divided by twice the tangent of the angle.

Why are tension results not shown in kilograms?

Kilograms measure mass, while tension is force. The calculator accepts load in kilograms or pounds, converts it to weight force using standard gravity, and reports forces in newtons, pound-force, or kilogram-force.

What working load limit should I enter?

Enter the manufacturer's published working load limit for one complete suspension side in the selected unit. Do not substitute breaking strength, and remember that the lowest-rated component or connection can govern the system.

Does a passing rating comparison prove the hammock is safe?

No. The comparison covers only the entered per-side limit under a static simplified model. Anchors, trees, fasteners, straps, knots, hardware, fabric, stitching, wear, dynamic loading, installation, and manufacturer instructions still require separate checks.