全长，通常缩写为（LOA，O/A，O.A.或OA）是指船只从船体上垂直水线测量得两点的最大长度。

Length overall, often abbreviated as (LOA, o/a, o.a. or oa) is the maximum length of a vessel's hull measured parallel to the waterline. This length is important while docking of the ship. It is the most commonly used way of expressing the size of a boat, and is also used for calculating the cost of a marina berth (for example, £2.50 per metre LOA).