By metric unit   By imperial units Note(background or source) Inputvalue Produces Inputvalue Produces 3mm  3 ft 6 in gauge by 1:450 (Cape gauge, T scale) 4mm  4.5mm  0.177in0.177"  4.8mm  s.g. by 1:300 (ZZ scale) 0.25in0.25"0.250in0.250"  6.5mm  0.256in0.256"  s.g. by 1:220 (Z scale) 0.276in0.276"  8mm  8.97mm  0.353in0.353"  s.g. by 1:160 (a more exact N scale; FiNe definitions) 9mm  s.g. by 1:160 (N scale, British N gauge) 3ft gauge by 1:101.6 (3mm scale) 9.42mm  s.g. by 1:152 (2mm scale) 10.5mm  0.413in0.413"  0.47in0.47"0.470in0.470"  12mm  0.472in0.472"0.473in0.473"  1000 mm by 1:87 (metre gauge, H0m scale)1067 mm by 1:87 (Cape gauge, HOn3-1/2 scale)s.g. by 1:120 (TT scale) 12.7mm  0.5in0.5"  13mm  13.5mm  4ft 6in gauge by 1:101.6 (Scotch gauge, 3mm scale) 14mm  2 ft gauge by 1:43.5 (7mm to 1 ft; O14) 14.125mm  s.g. by 1:101.6 exact (normalised into 14.2 mm in 3mm scale) 14.2mm  s.g. by 1:101.6 (normalised, see 14.125 mm, 3mm scale) 14.28mm  14.3mm  0.563in0.563"  14.3mm  0.563in0.563"  15.75mm  1600 mm gauge by 1:101.6 (Irish gauge, 3mm scale) 16.2mm  16.5mm  0.65in0.65"0.650in0.650"  s.g. by 1:87 (HO scale)1676 mm gauge by 1:101.6 (Indian broad gauge, 3mm scale) 18mm  18.2mm  s.g. by 1:76 nominally (4mm to 1 ft; EM gauge) 18.83mm  s.g. by 1:76 (4mm to 1 ft; P4 gauge) 19mm  19.05mm  0.75in0.75"0.750in0.750"  19.4mm  20.5mm  21mm  2140 mm gauge by 1:101.6 (Brunel gauge, 3mm scale) 0.865in0.865"  22mm  22.42mm  0.883in0.883"  s.g. by 1:64 (S scale) 22.5mm  23mm  24mm  28.08mm  1.125in1.125"  1.177in1.177"  30mm  s.g. by 1:48 O scale 1.25in1.25"  s.g. by 1:45.2 O scale 32mm  s.g. by 1:44.8 O scale18 in gauge by 1:13.7 ( in to 1 foot; SE scale) 32.96mm  s.g. by 7 mm to 1 foot O scale 33mm  s.g. by 1:43.5 as defined by ScaleSeven 35mm  36.75mm  5ft 3in to 1:43.5 (Irish gauge, ScaleSeven) 1.75in1.75"  s.g. by ca. 1:32 (1 gauge)1.000 mm gauge by 1:22.5 (G scale) 1.766in1.766"  s.g. by 1:32 exactly (1 gauge) 45mm  1.772in1.772"  3 ft gauge by 1:13.7 ( in to 1 foot; SE scale) 49.20mm49.2mm  7ft in by 1:43.5(Brunel gauge, ScaleSeven) 50.8mm  2in2"  Mentioned here: " inch to 1 ft". Prototype would be  ft (267 mm, see ). Historical (~1900).   2.125in2.125"  Wide Gauge (or আদর্শ গেজ (toy trains)) 63mm  63.5mm  2.5in2.5"  64mm  70.69mm, 70.64mm  2.781in, 2.781"  s.g. by 1:20.3 (F- or 15mm scale): NMRA Popular Railway ScalesNMRA 70.64mm,NMRA Proto ScalesNMRA 70.69mm(NMRA gives two sizes in mm) 89mm  3.5in3.5"  108mm  4.75in4.75"  127mm  5in5"  184mm  7.25in7.25"  190.5mm  7.5in7.5"  8.25in8.25"  9in9"  9.5in9.5"  254mm  10in10"  260mm  10.25in10.25"  10.5in10.5"  See  (scale  in to 1 ft). 305mm  12in12"  311mm  12.25in12.25"  356mm  350mm  Decauville in the Netherlands 381mm  15in15"1ft3in1'3"    15.25in15.25"  Yunnan-Burma Railway Track gauge 400mm0.4m  16in16"1ft4in1'4"  410mm  Narrow gauge railways in Germany#Hesse 16.5in16.5"1ft4.5in1'4.5"  17in17"1ft5in1'5"  450mm  457mm  18in18"1ft6in1'6"  483mm  19in19"1ft7in1'7"  19.5in19.5"1ft7.5in1'7.5"  500mm0.5m  508mm  20in20"1ft8in1'8"  557mm  2 Castilian feet (@ 278.6 mm) 21in21"1ft9in1'9"  550mm  Narrow gauge railways in Denmark Decauville in the Netherlands 559mm  22in22"1ft10in1'10"  578mm  22.75in22.75"1ft10.75in1'10.75"  597mm  23.5in23.5"1ft11.5in1'11.5"  600mm0.6m  603mm  23.75in23.75"1ft11.75in1'11.75"  610mm  24in24"2ft2'  24.125in24.125"2ft0.125in2'0.125"  620mm  Decauville in the Netherlands 622mm  24.5in24.5"2ft0.5in2'0.5"  26in26"2ft2in2'2"  686mm  27in27"2ft3in2'3"  27.5in27.5"2ft3.5in2'3.5"  700mm0.7m  27.75in27.75"2ft3.75in2'3.75"  711mm  28in28"2ft4in2'4"  716mm  Narrow gauge railways in Poland#overview Existed until 1923. 28.5in28.5"2ft4.5in2'4.5"  29in29"2ft5in2'5"  750mm0.75m  29.5in29.5"2ft5.5in2'5.5"  Bosnian760mm  Bosnian gauge 762mm  Imperial30in30"2ft6in2'6"  Imperial gauge 765mm    30.5in30.5"2ft6.5in2'6.5"  783mm  785mm  791mm  Narrow gauge railways in Denmark#Faxe Jernbahne, gauge unclear Google translated: In the following book, Østbanen 1879-2004, indicated gauge to 2 ½ feet or 791 mm. Nevertheless acquired Garde in 1866 a used German mine locomotive gauge 785 mm. This difference in gauge targets impossible did not [did not make impossible], however, use of the locomotive, which was in operation on the field all the way to 1921. This is perhaps one of the reasons for the doubts surrounding the runway actual gauge, there are several places specified for both 785 mm (evp have even one such example) and 791 mm. Thus mention Wikipedia : "There is no doubt about the route originally used gauge. Figures have admittedly several places in the literature as 791 mm, but in the delivery protocol of train factory Krauss set in 1874, 1907, 1914 and 1927 having delivered locomotives gauge 785 mm. It is somewhat unclear why mentioned one at the track width 791 mm. There should probably be a shift over the years, since Faxe Limestone Quarry around 1970 ordered 2 diesel locomotives in Schöma with a desired track width of 791 mm." 800mm0.8m  31.5in31.5"2ft7.5in2'7.5"  802mm  32in32"2ft8in2'8"  820mm  32.5in32.5"2ft8.5in2'8.5"  838mm  33in33"2ft9in2'9"  850mm    33.75in33"2ft9.75in2'9.75"  860mm    864mm  34in34"2ft10in2'10"  34.5in34.5"2ft10.5in2'10.5"  35in35"2ft11in2'11"  891mm  900mm0.9m  914mm  36in36"3ft3'  925mm   37in37"3ft1in3'1"  37.125in37.125"  950mm  955mm  965mm  38in38"3ft2in3'2"  38.25in38.25"3ft2.25in3'2.25"  985mm  Zugerbergbahn funicular metremeterm10001000mm11m  39.375in39.375"3ft3.375in3'3.375"  মিটার গেজ, meter 1009mm  Nominally  1016mm  40in40"3ft4in3'4"  40.5in40.5"3ft4.5in3'4.5"  40.75in40.75"3ft4.75in3'4.75"  1050mm  1055mm  41.5in41.5"3ft5.5in3'5.5"  1062mm  1065mm  See Cape gauge wrt South Africa: sourced as such 1067mm  Cape42in3ft6in3.6ft  Cape gauge (South Africa) 1093mm  43in3ft7in  1100mm1.1m  1106mm  43.5in43.5"3ft7.5in3'7.5"  44.25in44.25"3ft8.25in3'8.25"  44.5in44.5"3ft8.5in3'8.5"  45in45"3ft9in3'9"  45.5in45.5"3ft9.5in3'9.5"  1188mm    47in47"3ft7in3'7"  1200mm  1217mm    1219mm  48in48"4ft4'  1245mm  49in49"4ft1in4'1'    49.5in49.5"4ft1.5in4'1.5'  1270mm  50in50"4ft2in4'2'  1295mm   51in51"4ft3in4'3"  1300mm  Funiculars of Lyon  52in52"4ft4in4'4"   52.5in52.5"4ft4.5in4'4.5"  1350mm  Santos_tramways 1372mm   Scotch54in54"4ft6in4'6"  Scotch gauge  54.5in54.5"4ft6.5in4'6.5"  55.5in55.5"4ft7.5in4'7.5"  55.75in55.75"4ft7.75in4'7.75"  1422mm  56in56"4ft8in4'8"    56.25in56.25"4ft8.25in4'8.25"  1432mm  sgstandard1435mm  ussgusstandardnasgnastandard56.5in4ft8.5in  আদর্শ গেজ, US আদর্শ গেজNote that input "us-..." and "na-..." places imperial measure first. 1440mm    1445mm    57in57"4ft9in4'9"  1450mm    1458mm    57.5in57.5"4ft9.5in4'9.5"  1473mm  Ohio58"58in4ft10in4'10"  Ohio gauge   58.75in58.75"4ft10.75in4'10.75"  1495mm  Toronto58.875"58.875in4ft10.875in4'10.875"  Toronto Transit Commission 1500mm1.5m  Russian1520mm1.52m  Russian 1524mm  60in60"5ft5'  60.5in60.5"5ft0.5in5'0.5"  62in62"5ft2in5'2"    62.1875in62.1875"5ft2.1875in5'2.1875"  1581mm  62.25in62.25"5ft2.25in5'2.25"  1588mm  62.5in62.5"5ft2.5in5'2.5"  62.5 in = Pennsylvania Trolley Gauge VictorianIrish1600mm1.6m  63in63"5ft3in5'3"  Victorian (Rail gauge in Australia), Irish gauge Victorian  As Irish, with different link:  1638mm  Baltimore Streetcar System 1664mm  pre-1955 Portuguese gauge (5 Portuguese feet?) 1668mm1.668m  Iberian gauge since 1955, average of older Portuguese and Spanish gauges. 1672mm  pre-1955 Iberian gauge (6 Castilian feet @ 278.6 mm) 1676mm  ProvincialIndian66in66"5ft6in5'6"5.5ft  Provincial, Indian broad gauge 1680mm  68in  Fisherman's Walk Cliff Railway, Babbacombe Cliff Railway 1.75m1750mm  1829mm  72in72"6ft6'  1850mm  Falls Incline Railway 1880mm  74in74"6ft2in6'2"  1945mm  7ft exactexact 7ft7ft0in  Original Brunel gauge 2140mm  Brunel84in84"7ft7'84.25in84.25"7ft0.25in 7'0.25"  Brunel gauge (Great Western Railway) 2000mm2m    8ft  Johnstown Inclined Plane 3000mm3m  120in120"10ft10'  8200mm  Funicular#Inclined lift