Conventional OS Map Sizes
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Scale        Inch     Map Size       Sheet Size    Marketing Name
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1:1,000,000  25mile
  1:500,000  10mile
  1:250,000  4mile  200km x 150km    80cm x  80cm  Quarter-Inch
  1:100,000  2mile
   1:50,000  1"      40km x 40km     80cm x  80cm  Landranger

   1:25,000  2.5"    20km x 30km     80cm x 120cm  Outdoor Leisure
   1:25,000  2.5"    30km x 20km    120cm x  80cm  Outdoor Leisure

   1:25,000  2.5"    20km x 20km     80cm x  80cm  Explorer
   1:25,000  2.5"    20km x 30km     80cm x 120cm  Explorer
   1:25,000  2.5"    30km x 20km    120cm x  80cm  Explorer

   1:25,000  2.5"    20km x 10km     80cm x 40cm   Pathfinder
   1:25,000  2.5"    10km x 10km     40cm x 40cm   Pathfinder

   1:10,000  6"     5? km x 5? km  50? cm x 50? cm
    1:5,000  12"
    1:2,500  25"      1km x 1km      40cm x 40cm
    1:1,250  50"    0.5km x 0.5km    40cm x 40cm
      1:500  10'  0.250km x 0.250km  50cm x 50cm   Town Plan