The most common ship scales are:
1:96 (metric = 1:100), one inch = 96 inches. A six foot man is about 3/4 inches tall (in scale)
1:192 (metric = 1:200), one inch = 192 scale inches, A six foot man is about 3/8 inches tall (in scale)
1:350 (metric = 1:400), one inch = 350 scale inches. A six foot man is about 2/10 inches tall (in scale)
1:700 (also 1:720), one inch = 700 scale inches. A six foot man is 1/10 inch tall.
There are some kits in aircraft scale 1:72 -- six feet = 1 inch.
There are also kits in 1:1200 -- one inch = 100 feet
Dimensions : the size of the subject and the scale determines the size of the model. As ship modelers we routinely have subjects that range from 35 feet and shorter (LCVP) up to 1100 feet and longer (Nimitz class carrier).