As one of the eight original German Type IX submarines, later designated IXA, U-37 had a displacement of  when at the surface and  while submerged. The U-boat had a total length of , a pressure hull length of , a beam of , a height of , and a draught of .
The German Type IX submarine U-37, originally designated IXA, had a displacement of when at the surface and  while submerged. The submarine measured  in total length, with a pressure hull length of , a beam of , a height of , and a draught of .