Turning destroyer tonnage into usable flotillas

The historical destroyer rules produced awkward fractional ship counts within a fleet's tonnage allowance. Ships laid down before 1920 could be replaced at twelve years, while later ships reached the threshold at sixteen. The alternative retains a 5.1-inch gun ceiling, allows ordinary destroyers up to 1,600 tons and increases the individual leader limit to 2,000 tons. Britain and the United States each receive 200,000 tons, Japan 140,000 and France and Italy 80,000 apiece. Sixteen British or American leaders leave enough tonnage for either 105 destroyers of 1,600 tons or 112 of 1,500 tons. With eight destroyers and one leader per flotilla, those options give thirteen flotillas with spare ships or fourteen flotillas with two spare leaders. Japan's examples suggest eleven leaders with roughly seventy-four larger destroyers or seventy-nine smaller ones, but those rounded combinations slightly exceed 140,000 tons and would need trimming. Clear arithmetic makes the relationship between treaty ceilings and usable formations easier to inspect.