How heavy should anchor chain be?

The weight of an anchor chain used for a vessel depends on several factors, including the size and type of the vessel, the expected weather and sea conditions, and the type of anchor being used. There isn't a fixed weight requirement for anchor chains, but rather guidelines based on the vessel's length and displacement.

As a general rule of thumb, the length of anchor chain should typically be at least 1.5 to 2 times the length of the vessel. For example, a boat that is 30 feet long might use an anchor chain that is 45 to 60 feet in length.

Additionally, the weight of the anchor chain itself contributes to its effectiveness in holding the anchor in place. The weight helps the anchor dig into the seabed and resist movement caused by wind, currents, and waves.

The weight of the chain is often expressed in terms of the chain's diameter and the length of the chain (per unit length, usually per meter or per foot). For larger vessels, heavier chains with larger diameters might be required to provide sufficient holding power.

It's essential to consult the vessel's manufacturer recommendations or maritime guidelines to determine the appropriate size and weight of the anchor chain based on the vessel's specifications and intended use. Factors such as the vessel's displacement, the prevailing weather conditions, and the type of anchoring locations should be considered when selecting the appropriate weight and length of the anchor chain for a specific vessel.