Climbing Rope Length Calculator
Enter the height of the route or rappel to see how much rope you need and a recommended length to buy or bring. A top rope, lower or single rappel uses two strands over the height, so you need twice the height plus margin.
How to size a climbing rope
- Enter the height of the route or rappel in meters.
- Choose top rope or lower for single-pitch climbing, or rappel for a single rappel.
- Read the rope needed and the recommended rope length below.
Examples
30 m route, top rope or lower
routeHeightM 30, mode topRopeOrLower
Rope needed 60 m, recommended 70 m
Frequently asked questions
Why do I need twice the route height of rope?
On a single-pitch top rope or lower, the rope runs from the ground up to the anchor and back down, so two strands span the height. A 30 m route needs about 60 m of rope. This is an educational aid only, so get proper instruction and always check your system before climbing.
Why always knot the end of the rope?
A stopper knot in the free end stops the rope from running through the belay or rappel device if it is too short for the pitch, which is a leading cause of lowering and rappelling accidents. Tie one every time. This is an educational aid only, so get proper instruction and always check your system before climbing.
How much margin should a rope have?
This tool adds a few meters of safety margin then rounds up to a common rope length, so the ends reach the ground with rope to spare. Longer routes still demand care and a knotted end. This is an educational aid only, so get proper instruction and always check your system before climbing.
Does this cover multi-pitch routes?
No. It sizes single-pitch top ropes, lowers and single rappels. Multi-pitch climbs, traverses and double-rope rappels need their own planning and topo. This is an educational aid only, so get proper instruction and always check your system before climbing.
Is a longer rope always safer?
Not by itself. The right length plus knotted ends, a closed system and an attentive belayer matter far more than extra meters coiled at your feet. This is an educational aid only, so get proper instruction and always check your system before climbing.
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