For most cruising sailboats, the best all-around anchor is a spade anchor with a roll bar (a modern plow-style design): it offers excellent holding power for its weight and sets reliably in sand, mud, clay, and even rock. The right anchor for your boat comes down to four factors—how long you will stay anchored, your boat’s length, the bottom type where you sail, and the anchor material.
Anchor types at a glance
| Anchor type | Best anchoring duration | Best for |
|---|---|---|
| Plow with roll bar (spade) | Short and long stays (overnight and beyond) | Boats over 50 ft and serious cruisers; works on all bottom types |
| Plow | Short stays (less than one day) | Boats 16–50 ft on mud and sand |
| Wing | Short stays (less than one day) | Boats 21–50 ft on mud and sand |
| Claw | Short stays (less than one day) | Boats 16–50 ft on mud and sand |
| Fluke | Very short stays (a few hours, under active watch) | Boats 16–20 ft; light lunch hook for mud and sand |
| Mushroom | Long-term | Permanent moorings and mooring buoys |
| Grapnel | Very short stays (a few hours, under active watch) | Dinghies and small boats up to 15 ft; rocky bottoms |
How does anchoring time affect which anchor I need?
The longer you plan to stay anchored, the more holding power you need. Anchor designs vary widely in how much holding power they offer relative to their weight—simple designs like the grapnel are meant for brief, watched stops, while modern roll-bar spade anchors are built to hold securely for extended periods across a wide range of bottom types.
For a quick lunch stop of a few hours, a light fluke or grapnel anchor is enough. For a day hook—anchoring for less than a full day—claw, wing, and plow anchors all work well. If you will anchor overnight or longer, choose a plow with a roll bar for its superior holding power, or a mushroom anchor if you are setting up a permanent mooring.
What size anchor does my boat need?
Your boat’s length overall (LOA) determines how much weight and resistance the anchor must provide. As a general guide from our sizing tables:
- Up to 15 ft (dinghies and tenders): a small grapnel anchor is the practical choice.
- 16–20 ft: claw, plow, or fluke anchors sized for the boat.
- 21–50 ft: claw, wing, or plow anchors; this is the core cruising range.
- Larger boats and mooring buoys: a plow with a roll bar for anchoring, or a mushroom anchor for a permanent mooring.
Within each type, manufacturers publish weight recommendations by boat length and displacement—when in doubt between two sizes, go one size up. An oversized anchor costs little extra; a dragging anchor can cost you the boat.
Which anchor works best for each bottom type?
The shape and sharpness of an anchor determine how well it penetrates and holds in different seabeds. This is where designs differ the most:
| Anchor type | Clay | Rock / coral | Mud | Sand |
|---|---|---|---|---|
| Plow with roll bar (spade) | Works well | Works well | Works well | Works well |
| Plow | Poor | Struggles | Works well | Works well |
| Wing | Poor | Struggles | Works well | Works well |
| Claw | Struggles the most | Does not work | Works well | Works well |
| Fluke | Poor | Poor | Works well | Works well |
| Grapnel | Poor | Works well | Poor | Poor |
| Mushroom | Works well | Works well | Works well | Works well |
If you sail in one home area with a known bottom—say, a mud-bottom lake—a claw or fluke anchor is inexpensive and effective. If you cruise between anchorages with mixed and unknown bottoms, the roll-bar spade is the only type on the list that performs well everywhere.
Which anchor material should I choose?
Most sailors choose galvanized steel for its price-to-performance value. Stainless steel offers the same strength with lasting corrosion resistance and a much better appearance on the bow, at a significantly higher price. Aluminum anchors are favored by racing sailboats and dinghies because of their very light weight, though they are not as strong as steel.
| Material | Cost | Strength | Corrosion resistance |
|---|---|---|---|
| Galvanized steel | Inexpensive | Strong | Resistant while the galvanizing lasts |
| Stainless steel | Very expensive | Strong | Highly resistant |
| Aluminum | More than galvanized, less than stainless | Not as strong as steel | Resistant |
Frequently asked questions
What is the best anchor for a cruising sailboat?
A spade anchor with a roll bar is the best all-around choice: it offers excellent holding power for its weight and works well in sand, mud, clay, and rock, so it handles unknown anchorages with confidence.
Which anchor has the highest holding power?
Holding power depends on both anchor design and the seabed. Modern roll-bar spade anchors are generally considered the best all-around performers because they combine strong holding power with reliable setting across sand, mud, clay, and rock. In soft mud specifically, fluke-style anchors can also deliver very high holding power for their weight, though they underperform on rock or grass.
What anchor should I use for a dinghy or small boat under 15 feet?
A grapnel anchor is the standard choice for boats up to 15 ft—it is compact, folds for stowage, and grips well on rocky bottoms.
What anchor works best in rocky or coral bottoms?
Roll-bar spade anchors and grapnels perform well on rock; claw and fluke anchors should be avoided there because they cannot dig in reliably.
Are stainless steel anchors worth the extra cost?
Stainless steel matches galvanized steel in strength and adds lasting corrosion resistance and a polished look; it is worth it if appearance and longevity matter more to you than price.
What is a mushroom anchor used for?
Mushroom anchors hold only about 10 times their weight but sink into the bottom over time, which makes them ideal for permanent moorings and mooring buoys rather than everyday anchoring.