Figure-Eight Knot
stopper knot
Sailors and, later, climbers converged on the figure-eight for the same reason: it does the overhand knot's job - stopping a rope end from running back through a block, cam device, or grommet - while giving up far less of the rope's strength to do it. The difference comes down entirely to geometry. Where an overhand forces the rope into its tightest possible bend, the figure-eight's extra loop opens that bend out, and rope testing consistently shows a gentler bend radius correlates with better retained strength.
Tying it takes one more move than an overhand: form a loop, wrap the working end behind the standing part, then bring it forward through the first loop to complete the second lobe of the '8' shape it's named for. Dressed correctly, the finished knot looks genuinely like the numeral eight lying on its side, which makes a poorly-tied one easy to spot at a glance - a real, practical advantage in a safety check.
On a climbing rope it's the default terminal stopper knot at the end not already tied into a harness, precisely because it holds firmly, resists working loose, and remains easier to untie after a fall than the tighter-jamming overhand would be.
Sailors historically favored it for exactly the same reason climbers do today, just in a different context: a halyard or sheet running out through a block unexpectedly is a real hazard on a moving boat, and a figure-eight tied in the bitter end stops that without weakening the line as much as a plain overhand would, or jamming in the block the way an oversized knot might. The knot's numeral-eight shape also makes a poorly dressed one unusually easy to spot by eye, which is a real practical advantage in any safety check - a crossed or lopsided figure-eight looks visibly wrong even to someone who's only seen the correct shape a few times.
How to tie the Figure-Eight Knot
Form a loop near the rope's end, working end crossing over the standing part.
Strength & security
Approx. strength retained: 75-80%
Its wider bend radius, compared to a plain overhand knot, is precisely why it retains noticeably more of the rope's rated strength while still stopping the rope reliably from running through a block, cam, or grommet.
Cautions: It's bulkier than an overhand knot, which occasionally matters when a rope must pass through a very tight fairlead or pulley, but that bulk is rarely a real problem in practice.
Alternatives
- Overhand Knot
Smaller and marginally faster to tie, but costs the rope more strength thanks to its tighter bend - only worth choosing where bulk is the deciding factor.
FAQ
Is the figure-eight stronger than the overhand knot?
Yes, measurably - its wider bend radius costs the rope less rated strength, which is the main reason it's preferred wherever strength genuinely matters, such as at the tail end of a climbing rope.
Is it hard to untie after being loaded?
It's generally easier to untie than an overhand knot after a load, though not as easy as before loading - dressing it neatly before use helps keep it from over-tightening.
Why is the figure-eight knot easy to inspect visually?
Its distinctive numeral-eight shape makes a poorly tied or crossed version visibly obvious at a glance, even to someone without much knot-tying experience - a real advantage during a safety check.
Can the figure-eight knot be tied one-handed?
It's harder than a plain overhand to tie one-handed because of its extra loop, though experienced sailors and climbers can do it with practice - a genuinely useful skill when the other hand is occupied holding a sail, a rope under tension, or a handhold. Most people learn the two-handed method first and only pick up a one-handed variation later, if at all.
Does the figure-eight knot work equally well in all rope materials?
It performs reliably in nylon, polyester, and most synthetic climbing and sailing rope, though very stiff or very slick specialty cordage - some ultra-high-molecular-weight polyethylene ropes, for instance - can need extra care dressing the knot fully before it's trusted under load.
Is a figure-eight knot ever used as a decorative knot?
Occasionally, in paracord and jewelry work, purely for its distinctive shape, though its primary role everywhere else remains functional - stopping a rope end from running through a block, cam, or grommet.