Sailing Knots Every Sailor Must Know (With Diagrams)

Skill level

Beginner

Knots covered

5 essential

Practice time

1–2 hours

Most important

Bowline

In this guide

The bowline
Cleat hitch
Round turn & two half hitches
Reef knot
Figure-of-eight stopper knot
Frequently asked questions

The bowline

The bowline (boh-lin) is the single most important knot in sailing — a fixed loop that won't slip or jam under load, and releases easily once tension is off. It's used for attaching sheets to headsail clews, creating a temporary mooring loop, tying fenders, and dozens of other applications. Learn this one first, and learn it until you can tie it in the dark with cold hands.

Bowline — creates a fixed loop in the end of a line

Make a small overhand loop in the standing part (the "rabbit hole")
Pass the working end up through the hole from below (rabbit comes up)
Lead the working end around behind the standing part (rabbit runs around the tree)
Pass the working end back down through the loop (rabbit goes back down the hole)
Pull tight on the standing part while holding the loop

Bowline in three steps — the rabbit hole method

Memory aid: "The rabbit comes up through the hole, runs around the tree, and goes back down the hole." It sounds childish. It works for life.

Cleat hitch

The cleat hitch secures a line to a cleat on the dock or on the boat itself. It's fast to tie, fast to release, and holds under any load. You'll use this every time you leave or arrive at a dock.

Cleat hitch — full turn around base, figure-8 over horns, locking hitch

Take a complete turn around the base of the cleat (not the horns)
Lead the line over the top horn diagonally, then under the far horn
Repeat — you've made a figure-8 over the two horns
Finish with a locking hitch: twist the last pass before placing it over the horn so it locks under itself

Common mistake: Skipping the initial turn around the base and going straight to figure-8s. The base turn takes the load — without it, the horns bear all the stress and the line can jump off under shock loading.

Round turn & two half hitches

The round turn and two half hitches attaches a line to a fixed object — a ring, rail, post, or bollard. It's particularly useful for attaching fenders to a toe rail or securing a dinghy painter to a ring. The round turn (two full passes around the object) takes the load; the half hitches lock it.

Round turn and two half hitches — round turn takes the load, hitches lock it

Pass the working end around the object twice (the "round turn")
Bring the working end over and around the standing part — first half hitch
Repeat in the same direction — second half hitch
Ensure both half hitches lie neatly and pull tight

Reef knot

The reef knot joins two ends of the same line — originally used for tying reef points around a sail when reducing sail area (hence "reef" knot). It lies flat, doesn't bulk up, and unties easily with a sharp pull. It's not a general-purpose joining knot for two separate lines under load — for that, use a sheet bend.

Reef knot — right over left, left over right — flat and symmetrical

Cross right over left and tuck under — first half knot
Cross left over right and tuck under — second half knot
Pull both ends to tighten — the knot should lie flat and symmetrical

How to check it's right: Both bights should lie parallel to each other. If the ends exit from opposite sides (a "granny knot"), it's wrong and will jam under load.

Figure-of-eight stopper knot

The figure-of-eight is tied at the end of a sheet or halyard to prevent it from running through a block or clutch when the line is accidentally released. Every sheet and halyard on a well-rigged boat should have one. Without it, a flogged-out sheet disappears to the top of the mast and someone has to go up the rig to retrieve it.

Figure-of-eight — stopper knot for sheets and halyards

Make a bight (loop) in the working end
Twist the loop once — the working end crosses over the standing part
Pass the working end back through the loop from the front
Pull both ends to tighten into a neat figure-8 shape

Why not a simple overhand knot? An overhand knot jams almost permanently under load and is hard to undo after a hard gybe. The figure-of-eight can always be untied by hand.

Frequently asked questions

What is the most important sailing knot?

The bowline. It creates a secure, fixed loop that won't slip or jam, and has more applications aboard than any other knot. Learn this one first.

How do I remember how to tie a bowline?

Use the rabbit analogy: the rabbit comes up through the hole, runs around the tree, and goes back down the hole. It sounds childish but it's permanent — ask any sailor who learned it that way.

Is the reef knot the same as a square knot?

Yes — the reef knot is also called a square knot in North America. Right over left, then left over right. It's symmetrical when tied correctly.

Can I use a reef knot to join two different lines?

No — the reef knot is only safe for joining two ends of the same line. For joining two different lines, use a sheet bend (same thickness) or a double sheet bend (different thickness).

What's the best way to practice sailing knots?

Buy a short length of rope (8–10mm, 2 metres) and keep it on your desk. Practice each knot until you can tie it confidently without looking. Then practice with your eyes closed. The goal is muscle memory — you may need to tie these in the dark, in rain, with cold hands.