Why does anchor angle matter?

As the angle between anchor legs increases, the force on each anchor point increases dramatically. At 0 degrees (legs parallel), each anchor shares the load equally. At 120 degrees, each anchor bears the full load. Above 120 degrees, forces exceed the original load, making the system dangerous.

What is the ideal anchor angle?

The ideal angle between anchor legs is 60 degrees or less. At 60 degrees, each anchor bears 58% of the load. Most climbing instruction recommends keeping the angle under 90 degrees. Never exceed 120 degrees as the forces multiply dangerously.

How many anchor points should I use?

For climbing anchors, a minimum of two independent anchor points is standard, with three being preferred for trad anchors. Each point should be independently strong enough to hold the load on its own. Use the SERENE or ERNEST acronyms: Solid, Equalized, Redundant, No Extension, Efficient.

CampCalcs

Anchor Calculator

Calculate load distribution across multiple anchor points at different angles. See how angle affects the force on each anchor.

Number of Anchor Points

Angle Between Legs

Angle between the two anchor legs

Total Load

Expected force on the anchor system

Anchor Type

How We Calculate This

This calculator uses vector force analysis to determine the load on each anchor point based on the angle between anchor legs.

Load distribution formula

Load per anchor = Total load / (2 x cos(angle/2))

Angle effects

0 degrees: Each anchor bears 50% of load
60 degrees: Each anchor bears 58% of load
90 degrees: Each anchor bears 71% of load
120 degrees: Each anchor bears 100% of load
>120 degrees: Forces exceed the load (dangerous!)

Frequently Asked Questions

Related Calculators

Rope Length Calculator

Calculate the minimum rope length needed for your climb and rappel.

Belay Calculator

Calculate belay forces, friction and holding power for different belay devices.

Knot Strength Calculator

Compare knot types and calculate retained rope strength after tying.

Fall Factor Calculator

Calculate fall factor, impact force and energy from fall distance and rope out.

Rack Calculator

Build a climbing rack list based on route grade, length and crack sizes.

Last updated: February 2026

All calculations are estimates. Always verify conditions and use proper safety equipment outdoors.