Infographic Tanker Sizes and Capacities Share There are five principle sizes of oil tankers. In ascending order based on size, the smallest is the Panamax, Aframax, Suezmax, VLCC and the ULCC. Published March 22, 2018 | Last modified on March 18, 2026 Trending Article Marine shipping in the Great Lakes: What you need to know Article Marine Fuels: What is Heavy Fuel Oil? Article The Polluter Pays Principle