LoopBeginnerEssential
Bowline knot
Get to know Bowline: what it does, when to use it, what to check and the mistakes to avoid.
Bowline knot
1The knot in plain words
In one sentence…
The bowline makes a fixed loop at the end of a rope that won't slip or tighten under a steady load.
What does it do?
It ties a loop at the end of a line that stays the same size. Pull on the rope and the loop doesn't close around what it holds.
When do I use it?
To drop a loop over a post or bollard, tie a line to a ring, or attach a sheet to the clew of a sail.
Why do sailors love it?
After a heavy load it can still be untied: push the collar forward to break the back of the knot.
When not?
Not when the load keeps coming and going on a slack line, and never as a life-safety knot: there it can shake loose.
2Knot ID card
- Knot family
- Fixed loop
- Difficulty
- Beginner
- Holds a steady load
- Yes, the loop keeps its size
- Unties after load
- Yes, easily
- Weak point
- Shakes loose when slack
- Also called
- King of knots
3How to check it
Step-by-step tying is being checked on real rope before we publish it. Until then, use the illustration and the checks below.
The collar wraps the standing part, not the eye.
The tail ends inside the eye and is clearly long enough.
There is one eye only, and it holds its size when you pull.
The strands lie neatly with no loose turn.
4Key points
- 1.
Bowline = a loop that does not slip.
- 2.
The end goes up, around, back down through the same small loop.
- 3.
Tighten by pulling the standing part while holding the end and the eye.
- 4.
Check it again whenever the line has been slack or flogging.
5Frequent mistakes
Mistake: Leaving a very short tail because the knot "looks tight".
Correct: Leave a clear tail beyond the knot and tighten the collar properly.
Mistake: Taking the end around the eye instead of around the standing part.
Correct: The collar must go around the standing part; otherwise the knot collapses.
Mistake: Trusting it on a line that flaps slack and then snaps tight again.
Correct: Inspect it often, or follow the boat's backup practice for that line.
6Don't mix it up
- Figure-eight loopThe figure-eight loop is harder to shake loose but can jam after a heavy load. The bowline unties more easily.Study it →
- Bowline on a bightNeed a loop in the middle of a rope, or two loops? Tie the bowline on a bight instead.Study it →
- Running bowlineWant the loop to slide and close around an object? That's the running bowline.Study it →
7Questions sailors ask
What is a bowline knot used for?
To make a fixed loop at the end of a line: dropping it over a post, tying to a ring or attaching a sheet to a sail.
Why is the bowline called the king of knots?
Because it holds a fixed loop under load and still unties easily afterwards, which few loops do.
Can a bowline come undone?
Yes. When the line goes slack and is loaded again and again, the bowline can work loose. Check it and leave a good tail.
Is a bowline or a figure-eight loop better?
The bowline unties easily after loading; the figure-eight loop is more secure but can jam. Choose by the job.
8Test yourself
What does a bowline give you?
Screen study teaches what the knot is for and how to check it. It doesn't prove you can tie it: practise with real rope, and never use these knots for climbing, rescue or anything that holds a person.
Sources
- NOAA Ocean Service — Tied Up in Knots
- United States Coast Guard Auxiliary — Auxiliary Boat Crew Qualification Guide, Volume I
- United States Coast Guard Auxiliary — Boat Crew Handbook — Seamanship Fundamentals
- National Association of State Boating Law Administrators — National Boating Education Standards: Plus Sailing Technical Report
- North Carolina Department of Insurance, Office of State Fire Marshal — Quick Drill: The Bowline Knot
- Armada Española — Nudos marineros
Content reviewed on September 21, 2026