How to Choose the Right Size Dock Lines for Your Boat

Ever wonder what size dock lines you need? The rating on a line isn't always practical for everyday use — the right size depends on how and where you're boating.

Whether you're tied up at the same slip every night, running offshore and back before sunset, or heading to a tournament three states away where you're unsure of the setup or conditions, it comes down to a few factors: boat length, line diameter, line length, cleat size, and how hard you're actually using it.

Start with the chart

Local boating — same slip, same marina, normal conditions? Go with the suggestions below.

• This chart isn't a manufacturer spec sheet — it's built from over 10 years of selling dock lines and seeing what sportfish captains and owners actually run and come back for.
• It's a reliable starting point for everyday local use, but every situation is different — some captains prefer other sizes.
• We stick to round numbers because they're easier to keep track of.
• Keep line lengths at least 10' apart so you always know which line's in your hand when you pick it up.

Note: These sizes are for regular day-to-day use — normal conditions, not much current or surge. For heavy use, step up one size. Line counts shown are minimums.

Traveling or heavy use? Go up a size

New marina, exposed slip, unfamiliar tournament dock, or just heavier daily wear — go up one size from the chart. More diameter means more abrasion resistance and less stretch fatigue, which matters more when you're not there to check on things every day.

Check your cleat size before you upsize

Confirm your cleat size before sizing up. A line too thick for your cleats won't seat properly — that's less secure, not more. Always match your final size to what your cleats can handle.

Solid color or custom?

• Standard: solid colors, typically in stock.
• Custom: multiple colors or a combination to match your boat — plan ahead for a 4–6 week lead time and a 300-foot minimum per order.
• Tip: most owners carry two to four spare lines anyway. Order enough custom line up front to cover those spares, so you can replace lines one at a time later without a whole new run.

The bottom line

• Local, everyday boating — the chart's got you.
• Traveling, surge, or heavy use — size up one, as far as your cleats allow.
• Want a buffer without going full custom? Just carry a few extra lines one size up in diameter.
• Want a custom look? Order enough up front to cover your spares — 300' minimum, 4–6 week lead time.

Still not sure what you need?

Stop by our Jupiter store or give us a call or text at 561-267-6069 — our team can help you nail down the right size, length, and quantity for your boat.