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Marine Rope & Dock Lines

Dock lines, mooring lines, anchor rode, and sailboat rigging from the brands boaters trust. Shock-absorbing nylon for docking and anchoring, low-stretch polyester for halyards and sheets, and high-performance blends - sold by the foot and cut to the length your boat actually needs.

Dock Line Finder

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1/2" Double Braid Dock Line
Nylon double braid · Recommended for 25 to 35 ft vessels
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Marine Rope

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Choosing the Right Marine Rope

The rope on your boat takes constant strain from saltwater, sun, abrasion, and load cycles. We stock marine rope for exactly that: dock lines, mooring lines, anchor rode, sailboat rigging lines, and marine accessories from manufacturers who build specifically for the water.

ROPE.com sells marine rope by the foot and in pre-cut lengths. No minimum orders. Pick the diameter, pick the length, and we cut it to order.


Dock Lines and Mooring

Dock lines take constant strain from tides, wind, and wakes. Nylon is the standard material because it stretches under load, which absorbs shock and protects your cleats and hardware. Double braid nylon is the most common construction for dock lines. 3-strand twisted nylon is a cost-effective alternative that is easy to splice and handles well.

Mooring lines face the same demands but often run longer and heavier. Diameter depends on boat length and displacement. As a general rule, use 1/2″ for boats up to 30 feet, 5/8″ for 30 to 45 feet, and 3/4″ or larger for anything above that.


Anchor Rode

Anchor rode connects your boat to the anchor. A nylon anchor line absorbs shock from waves and wind gusts. Most setups use a combination of chain at the anchor end and nylon line running up to the boat. 3-strand twisted nylon is the standard because it stretches well and is easy to splice to chain.


Sailboat Rigging and Running Lines

Sailboat rigging lines need low stretch for control and consistent handling under load. Polyester double braid is the standard for halyards, sheets, and control lines. High-performance blends with Dyneema or Spectra reduce weight and stretch further for racing applications. Yacht ropes from Marlow and New England Ropes cover everything from cruising to competitive sailing.


Material Guide

Nylon stretches under load and absorbs shock. The standard for dock lines, mooring, and anchor rode.

Polyester has minimal stretch. The standard for sailboat running rigging, halyards, and sheets.

Polypropylene floats, which makes it a common pick for ski tow lines, dinghy painters, and anywhere buoyancy matters. Not as strong or long-lasting as nylon or polyester.

3/8 inch double braid marine rope in royal blue

Marine Rope Sizing Guide

Match your rope to your boat and application

Dock Line by Boat Length

Boat LengthDiameterConstruction
Under 18 ft1/4″Nylon double braid →
18 – 25 ft3/8″Nylon double braid →
25 – 35 ft1/2″Nylon double braid →
35 – 45 ft5/8″Nylon double braid →
45 – 54 ft3/4″Nylon double braid →
54 – 72 ft1″Nylon double braid →
72 – 90 ft1-1/4″Nylon double braid →
90 – 108 ft1-1/2″Nylon double braid →
Over 108 ft2″Nylon double braid →

Mooring Line by Boat Length

Boat LengthDiameterConstruction
Up to 25 ft1/2″Nylon 3-strand →
25 – 35 ft5/8″Nylon 3-strand →
35 – 50 ft3/4″Nylon double braid →
50 ft +7/8″ – 1″Nylon double braid →

Anchor Rode by Boat Length

Boat LengthDiameterMinimum Length
Up to 20 ft3/8″150 ft →
20 – 30 ft1/2″200 ft →
30 – 45 ft5/8″250 ft →
45 ft +3/4″300 ft →

Material by Application

ApplicationMaterialWhy
Dock linesNylon →Stretch absorbs shock
MooringNylon →Load cycling durability
Halyards / SheetsPolyester →Low stretch
Ski tow / DinghyPolypropylene →Floats, lightweight

Rope Construction Guide

Match the construction to the job on your boat — click to shop each type

Nylon double braid dock line Double Braid Solid Colors
Dock / Mooring

Nylon Double Braid

Braided cover • braided core
Diameter: 1/4″–2″
Material: Nylon
Stretch: Moderate

Smooth, round braid that stretches under load to absorb shock from tides and wakes. The standard for dock lines and mooring.

Best for: Dock lines, mooring, general use
Shop Dock Lines →
3-strand twisted nylon anchor rope 3-Strand Twisted Nylon
Anchor / Mooring

3-Strand Nylon

Three twisted strands
Diameter: 3/8″–3/4″
Material: Nylon
Stretch: High

Maximum stretch to absorb surge, and the easiest construction to splice to chain. The classic anchor rode and mooring pennant.

Best for: Anchor rode, mooring pennants
Shop Anchor Rode →
Polyester double braid rigging line Sta-Set Polyester
Rigging

Polyester Double Braid

Low-stretch braid
Diameter: 3/16″–5/8″
Material: Polyester
Stretch: Low

Low-stretch braid that holds trim under load. The standard for halyards, sheets, and running rigging where control matters.

Best for: Halyards, sheets, control lines
Shop Rigging Lines →
Polypropylene floating rope Diamond Braid Polypro
Watersports

Polypropylene

Floating multifilament
Diameter: 1/4″–5/8″
Material: Polypropylene
Floats: Yes
Weight: Light

Lightweight line that floats and shrugs off water. Made for ski tow lines, dinghy painters, and utility jobs where buoyancy matters.

Best for: Ski tow, dinghy painters, utility
Shop Watersports Rope →

Marine Rope FAQ

Common questions from boaters and riggers

What is the best rope for dock lines? +
Nylon is the standard material for dock lines. It stretches under load, which absorbs shock from tides, wakes, and wind gusts. Double braid nylon is the most popular construction for its smooth handling and durability. 3-strand twisted nylon is a proven, spliceable alternative that costs less.
What size dock line do I need for my boat? +
The general rule is 1/8 inch of rope diameter for every 9 feet of boat length. For a 30-foot boat, that means 1/2 inch dock lines. For a 45-foot boat, 5/8 inch. For boats over 50 feet, 3/4 inch or larger. Dock lines should be at least 2/3 the length of the boat for bow and stern lines, and longer for spring lines.
What is the difference between nylon and polyester rope for boats? +
Nylon stretches under load and absorbs shock. It is the standard for dock lines, mooring, and anchor rode where you want the rope to give under surging forces. Polyester has minimal stretch and holds its shape under load. It is the standard for sailboat running rigging, halyards, and sheets where you need precise control. Both are widely used on boats.
How long should my anchor line be? +
The standard scope ratio is 7:1, meaning 7 feet of rode for every 1 foot of water depth. In 20 feet of water, you need at least 140 feet of anchor rode. Most boats carry 150 to 300 feet of anchor line depending on where they anchor. 3-strand twisted nylon is the standard because it stretches well and splices easily to chain.
Should I use double braid or 3-strand for dock lines? +
Double braid nylon handles more smoothly, coils neatly, and looks cleaner on the dock. 3-strand twisted nylon is easier to splice, costs less, and performs just as well. Both are excellent for dock lines. Double braid is more common on larger boats and in marinas. 3-strand is popular with working boats and budget-conscious boaters.
Does polypropylene work for dock lines? +
Polypropylene floats and is lightweight, which makes it useful for ski tow lines, dinghy painters, and water rescue applications. However, it is not recommended for dock lines. It has lower strength, degrades faster in sunlight, and does not stretch enough to absorb shock loads the way nylon does.
What rope do I need for sailboat rigging? +
Halyards, sheets, and control lines need low-stretch polyester double braid for precise sail control. For racing, high-performance lines with Dyneema or Spectra cores reduce weight and stretch further. Line diameter depends on the boat size and the specific application. Larger boats need larger diameter lines to handle higher loads.
How often should I replace my dock lines? +
Inspect dock lines regularly for chafe, stiffness, discoloration, and broken fibers. In a typical marina environment, nylon dock lines last 3 to 5 years with proper chafe protection. Lines exposed to constant sun, heavy wakes, or rough pilings may need replacement sooner. If you see glazed or flattened spots from chafe, replace the line.

Why Boaters Choose ROPE.com

ROPE.com length meter cutting rope to order

Cut-to-Length

Buy exactly what you need

We cut every rope to order. Need 60 feet of dock line or 250 feet of anchor rode? You get that length, not a pre-packaged coil with waste.

Shop marine rope →
Marine rope brands under sail

Pro Brands Only

The names boaters trust

New England Ropes, Marlow, Samson, Yale, and our own ROPE.com line. Marine rope built for saltwater, sold direct.

Browse brands →
Free USA shipping on orders over $199

Free Shipping Over $199*

No surprises at checkout

Orders over $199 ship free. Most in-stock items ship within 1–2 business days.

Shipping policy →
ROPE.com team splicing rope at the workbench

Rope Experts on Staff

Real people who know rope

Questions about diameter, splicing, or what your boat needs? Call us. We splice, cut, and test rope every day.

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Shop by Brand

The marine rope brands boaters trust

New England Ropes marine rope Marlow Ropes marine rope Samson Rope Yale Cordage marine rope ROPE.com house brand rope

Marine Rope & Dock Lines at ROPE.com

We stock marine rope for saltwater and the constant load cycles that come with life on the water. We carry dock lines in nylon double braid and 3-strand, mooring lines for permanent and semi-permanent slips, anchor rode in 3-strand twisted nylon, and sailboat rigging lines in low-stretch polyester and high-performance blends.


Dock Lines & Mooring

Nylon dock lines absorb the shock of tides, wind, and passing wakes. Double braid nylon is the most popular construction for its handling and durability. 3-strand twisted nylon is a proven, spliceable alternative. We stock both in diameters from 3/8″ through 1″ and cut everything to length so you get exactly what your slip requires.

Mooring lines, anchor lines, rigging lines, and marine accessories are all available by the foot. No pre-packaged bundles. Questions about sizing? Our team can help you match rope to your boat.

Have questions? We’re here to help

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