Length overall

 ( Ship Measurements ) 

Length overall ( 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 the ship. It is the most commonly used way of expressing the size of a ship, and is also used for calculating the cost of a marina berth (for example, £2.50 per metre LOA).

LOA is usually measured on the hull alone. For , this may exclude the bowsprit and other fittings added to the hull. This is how some racing boats and tall ships use the term LOA. However, other sources may include bowsprits in LOA.

Confusingly, LOA has different meanings.

Otmar Schäuffelen (2025). 9781588163844, Hearst Books. . ISBN 9781588163844

"Sparred length", "Total length including bowsprit", "Mooring length" and "LOA including bowsprit" are other expressions that might indicate the full length of a sailing ship.

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LOD Often used to distinguish between the length of a vessel including projections (e.g. bow sprits, etc.) from the length of the hull itself, the Length on Deck or LOD is often reported. This is especially useful for smaller sailing vessels, as their LOA can be significantly different from their LOD.

Donald Launer (2025). 9781574092394, Sheridan House, Inc. . ISBN 9781574092394

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LOH In ISO 8666 for small boats, there is a definition of LOH, or length of hull. This may be shorter than a vessel's LOA, because it excludes other parts attached to the hull, such as .

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LWL Another measure of length is LWL (waterline length) which is more useful in assessing a vessel's performance. In some cases (particularly old or vessels with ) LWL can be considerably shorter than LOA.

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See also

• The National Register of Historic Vessels
• Length between perpendiculars
• List of longest ships

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Citations

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Sources

• William B. Hayler (2025). 9780870335495, Cornell Maritime Pr. ISBN 9780870335495
• Edward A. Turpin (1980). 087033056X, Cornell Maritime Press. 087033056X

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