Ratio Scale ft. Comments
1:20000 0.015 mm Arii produced injection-molded kits in this scale of the very large Zentradi spacecraft from the science fiction anime series Macross.
1:4800 0.064 mm This scale has been used for fictional spacecraft for the board game Star Cruiser, originally from Citadel Miniatures.
1:3900 0.078 mm Star Trek toys and miniatures are available in this scale.
1:3000 0.102 mm A line of science fiction miniatures is produced in this scale by Brigade Models for the board game Starmada.
1:2500 0.122 mm A European size for naval wargaming ship models. Also a popular scale for large fictional spacecraft used in gaming, (esp. Star Trek).
1:2400 0.127 mm A British and American size for naval wargaming ship models. Some science fiction miniatures in this scale.
1:2000 0.152 mm Valiant Enterprises produces its "Fighting Sail" line of "sailing men o'war" and related subjects in this scale.
1:1250 0.244 mm A European size for ship models.
1:1200 0.254 mm A British and American size for ship and harbor models.
1:1000 0.305 mm This is a scale used by Germans for pre-finished airliner models. Herpa produces several models in this scale.
1:720 0.423 mm This was a standard size for ship models produced by Revell and Italeri.
1:700 0.435 mm This is the scale that Tamiya, Aoshima, Hasegawa, and Fujimi chose to produce the largest series of waterline plastic model ships and submarines. Later Skywave, Dragon and Trumpeter joined in.
1:600 0.508 mm Popular for ships, especially liners and capital ships. This is the traditional scale for comparative drawings of ships, used by the Royal Navy as it is about one-tenth of a nautical mile to the foot. Warship models produced by Airfix
1:570 0.535 mm This scale was used by Revell for some ship models because it was one-half the size of the standard scale for wargaming models used by the US Army.
1:500 0.610 mm This is a scale used by Europeans for pre-finished airliner models. Trumpeter and several Japanese companies produce ships in this scale.
1:432 0.706 mm The scale used during the Second World War by the US Navy for aircraft recognition.
1:400 0.762 mm A European size for ship and submarine models and die cast aircraft.
1:350 0.871 mm A Japanese size for ship models. These are typically full-hull models that are substantially more detailed than 1:700 waterline models.
1:288 1.058 mm A scale for aircraft and rockets.
1:285 1.069 mm The US Army scale for sand-table wargames. It is also the standard used for large-scale historical and science fiction armor battles in hobbyist miniature wargaming, where it is often referred to as "6mm" (for the average infantry figure height). For hobbyist wargaming purposes, 1:300 is considered to be interchangeable with this scale.
1:250 1.219 mm Used by Heller for model ships.
1:220 1.385 mm Same as Z gauge.
1:200 1.524 mm Very detailed aper model ships are found in this scale.
1:182.88 1.667 mm A newer scale utilized in ancient, fantasy and sci-fi hobbyist miniature wargaming. Known as 10 mm scale in wargaming circles.
1:160 1.905 mm American and European model trains in N scale.
1:152 2.005 mm 2mm scale/ British N scale railway modelling.
1:150 2.032 mm Used by Heller for model ships, and proposed by the Japanese to supersede 1:144 scale trains.
1:144 2.117 mm Popular for aircraft, spacecraft. Occasionally used with NASCAR cars. Also some Japanese N scale trains, as well as Japanese giant robot models and toys.
1:128 2.381 mm A few rockets and some fit-in-the-box aircraft are made to this size.
1:121.92 2.500 mm Very popular scale utilized in modern hobbyist miniature wargaming. Also known as 15 mm scale in wargaming circles.
1:108 2.822 mm An historic size for ships, also used for rockets and spacecraft. 15mm wargaming is considered interchangeable with this scale. [1]
1:100 3.048 mm A Japanese scale for aircraft, spacecraft, and giant robots.
1:96 3.175 mm An historic scale for ships, also used for spacecraft.
1:91.44 3.333 mm A popular scale for WWII hobbyist miniature wargaming. Also known as 20 mm scale in wargaming circles.
1:90 3.387 mm A scale proposed by some European manufacturers to supersede HO scale.
1:87.1 3.5 mm Exact H0 (half 0 of 7 mm = 1 foot)
1:87 3.503 mm Civilian and military vehicles. Same as HO scale.
1:82 3.717 mm An intermediate scale (H0/00) intended to apply to both H0 and 00 scale train sets. Also used for some military models
1:76.2 4 mm UK model rail scale 4 mm scale (00 gauge, etc.).
1:76 4.011 mm Military vehicles. Used with 4 mm to 1 foot models as well.
1:75 4.064 mm Used by Heller for model ships.
1:73.152 4.167 mm Common hobbyist miniature wargaming scale for sci-fi games. Also known as 28 mm scale in wargaming circles. There are also a large number of miniatures in this scale for fantasy wargaming and Role Playing Games. This scale is popularized by Games Workshop products, but there has been a scale creep over the years. The current miniatures are "Heroic 28mm" scale, which is closer to 1/48 or 1/50 scale. Due to this historical influence, many other hobbyist companies are following this practice.
1:72 4.233 mm Aircraft, science fiction, space non fiction, figures, vehicles, and watercraft. Now the most prolific small scale (i.e. less than 1:35) for plastic injection armored fighting vehicle (AFV) models. There is a growing popularity for scratch-built radio control model ships in this scale. More genres are covered in this scale than any other.
1:64 4.763 mm Ships, die-cast cars. Matchbox and Hot Wheels use this scale to describe their vehicles, although the actual scale of the individual models varies from 1:55 to beyond 1:100. Same as S gauge. Also called 3/16in. scale.
1:60.96 5.000 mm Common scale for pre-1970s hobbyist miniature wargaming figures. Some companies such as Privateer Press are producing new figures in this scale. Because 28 mm wargaming miniatures have crept in scale over the years, these new 30 mm wargaming miniatures are similar in proportion to the current 28 mm wargaming miniatures.
1:60 5.080 mm Used by Dungeons & Dragons Miniatures. A handful of high-detail, Japanese giant robot model kits primarily produced by Bandai are of this scale. Some Japanese toy manufacturers also produce aircraft toys in this scale.
1:55 5.644 mm Used only by Disney-Pixar Cars Die-Cast Line by Mattel.
1:50 6.096 mm Many European diecast construction vehicles and trucks. A small quantity of early Japanese aircraft kits are also of this scale.
1:48 6.350 mm Known as quarter scale. Mainly military aircraft, but in 2005 Tamiya launched a new series of armored fighting vehicle (AFV) models in this scale. It is used by Americans with the 0 scale. Architectural model scale corresponding to widely used architectural drawing scale in the U.S. Also the main Lego scale, know as minifig scale.
1:45 6.773 mm This is the scale which MOROP has declared must go with the 0 scale, because it is half the size of the G-gauge model railways made by German manufacturers.
1:43.5 7 mm Exact 0 scale of 7 mm = 1 foot.
1:43 7.088 mm Still the most popular scale for die-cast cars worldwide, metric or otherwise. It originates from the scale that the British use with the 0 scale.
1:40 7.620 mm The very early models of the British Coronation Coach and a few other horse-drawn wagons were made in this scale. Cheap soft plastic soldier figures are also made to this scale; there are a few kits to make vehicles for them.
1:35 8.709 mm The most popular scale for military vehicles and figures. It was originally conceived by Tamiya for convenience of fitting motorised parts and batteries.
1:34 8.965 mm A popular scale for collecting vintage and modern American truck models. Established by First Gear, Inc. in the early 90's with growing popularity in Europe and Australia.
1:33 9.236 mm The most common scale for paper model kits of aircraft.
1:32 9.525 mm Military vehicles; 54 mm toy soldiers are supposed to use this scale as well. Same as Gauge 1, cars, common for slot cars.
1:30.5 10 mm Often quoted as the alternative to 1/32 scale.
1:30 10.16 mm Toy soldiers and military vehicles including King and Country and Figarti.
1:29 10.51 mm American model trains running on 45 mm Gauge 1 track.
1:28 10.89 mm Biplane fighters.
1:25 12.19 mm Cars, figures. AMT (now combined with Ertl), Revell, and Jo-Han made cars in this scale. In Europe, this is preferred over 1:24. Holland has whole toy villages in this scale.
1:24 12.70 mm Cars, figures. Monogram made cars in this scale; Common scale for non-US companies including Tamiya. Popular doll house scale.
1:22.5 13.55 mm G Scale trains made by German manufacturers.
1:20 15.24 mm Cars, common for Formula One models.
1:19 16.04 mm 16mm scale Live steam model railways. This is also the scale for those "four-inch" adventure movie figurines.
1:18 16.93 mm Cars made from kits, children's dollhouses. The G.I. Joe: A Real American Hero line of figures and vehicles is in this scale, although the figures are compatible with 1:16 vehicles rather than 1:18 cars.
1:16 19.05 mm Live steam trains (non-ridable), Figures. Ertl's popular line of farm and construction machinery is produced in this size.
1:12 25.40 mm Action figures, Model cars (static and RC driven), Live steam trains (non-ridable), dollhouses for adult collectors
1:10 30.48 mm Motorcycles, Radio-controlled cars
1:8 38.10 mm Cars, motorcycles, Live steam trains (ridable), IC radio-controlled cars
1:7 43.54 mm Common scale utilized by Japanese companies for figures of anime characters, especially when the portrayed character is supposed to be young in age.
1:6 50.80 mm Articulated figures, such as G.I. Joe, Dragon and Barbie, static display sculpture (commonly of anime characters), motorcycles, Rail Cannons, Armored Vehicles, Military Dioramas.
1:5 60.96 mm Glow plug (model engine) & electric Radio-controlled cars
1:4 76.20 mm Glow plug (model engine) & electric Radio-controlled cars, plastic model engines
1:3 101.60 mm Ball-jointed dolls

Source: Wikipedia
-DiecastTrain.com