What Size Anchor Do I Need? Boat Anchor Sizing Guide

The right anchor keeps you where you dropped it, whether that is a lunch stop on a sandbar or an overnight in a quiet cove. The wrong one drags, wakes you up at 2am, or sits unused because it is a pain to handle. Here is how to size an anchor for your boat without guessing.

Start with anchor type

Different anchors hold in different bottoms.

Fluke anchors

Also called Danforth style, fluke anchors are the most popular choice for small and mid size boats. They dig deep in sand and mud, hold well for their weight and stow flat. They are the go to for most runabouts, center consoles and pontoons.

Plow anchors

Plow and scoop anchors reset quickly when wind or current shifts and hold across a wide range of bottoms. They are a strong choice for cruisers and anyone who anchors overnight.

Grapnel and mushroom anchors

Grapnel anchors fold up small and grab rock and grass, which makes them popular for kayaks and small craft. Mushroom anchors suit calm freshwater and permanent moorings.

Anchor size by boat length

Use this as a starting point for a fluke style anchor in normal conditions. Step up a size for heavy boats, high windage or rough water.

Do not forget the rode

The anchor is only half the system. Your rode, the line and chain between the boat and anchor, is what lets the anchor set. A length of chain at the anchor lowers the pull angle so the anchor digs in instead of skipping. A good rule is seven feet of rode for every foot of water depth. Match your rode and chain to your anchor and boat for a setup that actually holds.

Match it to your conditions

Anchoring in a strong current or exposed water? Size up. Soft mud or grass? A wider fluke or a plow will hold better than a compact anchor. When in doubt, carry a second anchor. Many boaters keep a primary anchor plus a smaller lunch hook.

Shop anchors at Boat Supplies Direct

We stock boat anchors from Lewmar, Fortress, Greenfield and more, plus all the rode, chain and anchoring accessories to complete your setup, in stock and ready to ship. Add your boat and we will help you match the right anchor and rode before you buy.