How to Calculate Windlasses?

First, determine the total weight of the anchor and rode. Second, take the total weight of the ground tackle and multiply by a factor of three to arrive at the required windlass pulling strength.

How do you size a windlass?

Sizing Considerations:

A typical rule of thumb is to take the total weight of the anchor and ground tackle and multiply by a factor of three. (for example a boat with a 22lb anchor and 40lbs of anchor rode and hardware would select a windlass with a power rating of more than 62*3= 186lbs).

How do you size an anchor?

It is recommended that you use a scope of 7:1, meaning that for every foot of water depth, you should use 7 feet of rode. For example, to anchor in 10 feet of water, you would pay out 70 feet of line. Measure the scope as the ratio of the length of the anchor rode to the height of the bow above the bottom.