Ummm, you could just learn that from experience.
The small merchants, passenger ships and trampsteamers always seem to have 2000 till 2500 tons. large merchants have 5000 and above and those other big ships ("Großer Ladung" in the german version) have 8000 and more I think. Tankers have the most, I think even a medium tanker brings more tonnage than a large merchant. The cruisers have around 10000 tons except for the south hampton class which has half of it I think.
May the veteran Kaleuns correct me if I'm talking crap.
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