Malaccamax is a naval architecture term for the largest tonnage of ship capable of fitting through the 25-metre-deep (82 ft) Strait of Malacca.

Bulk carriers and supertankers have been built to this tonnage, and the term is chosen for very large crude carriers (VLCC).

[2] Similar terms Panamax, Suezmax and Seawaymax are used for the largest ships capable of fitting through the Panama Canal, the Suez Canal and Saint Lawrence Seaway, respectively.

Some Chinamax and most Capesize and very large crude carriers cannot pass this strait.

Any post-Malaccamax ship would need to use even longer alternate routes because traditional seaways such as the Sunda Strait, between the Indonesian islands of Java and Sumatra would become too shallow for large ships.