How long is a boat usually compared with a ship?

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Alaska: Commercial fishing — boat A commercial salmon-fishing boat in Alaska.

While there is no single, universally defined length at which a boat becomes a ship, the distinction generally centers on size and intended use. A boat is typically defined as a smaller craft, whereas a ship is characterized as a large vessel capable of crossing open waters.1

In modern maritime contexts, a ship is often distinguished by its displacement, typically denoting a vessel of more than 500 tons. Conversely, boats are generally smaller and intended for more limited travel, though the terminology can be imprecise; for example, submarines are traditionally referred to as "boats" regardless of their actual size. Because usage varies, if you require a precise classification for a specific vessel, it is best to consult your local maritime authority.12