The world of miniatures has two ways of giving a a miniature’s scale. One is the known fraction (e.g. 1/300), which is also used in scale modeling. The other is the size (such as 6mm), where it is not exactly defined what this size represents – human eye height has been established as the standard. This results in a conversion factor equal to the average human eye height, about 1600 mm. There’s a tendency to make miniatures larger in order to have more space for details. The following table lists common scales.

Scale Size Examples
1/56 28mm Very popular for skirmish games. Games Workshop (Warhammer Fantasy und 40K, Lord of the Rings), and many others.
1/64 25mm Previously very popular, now partly replaced by 28mm. Star Wars Miniatures Battles, model railroad scale S.
1/72 22mm Plastic figures, popular for historic battles. Cheap!
1/80 20mm Increasingly used for 20th century, compatible with 1/72 and 1/76 vehicles.
1/87 18mm Heavy Gear (old), model railroad scale H0.
1/107 15mm Flames of War.
1/144 11mm Heavy Gear, plastic kits.
1/160 10mm Increasingly popular as “medium-sized” scale, affordable with sufficient detail. Mechwarrior Dark Age, model railroad scale N.
1/285, 1/300 6mm Smallest scale in which single soldiers can be represented sensibly, ideal for larger battles. Micro-Armour, aircraft, Battletech, Epic.
1/1200 1.3mm Sailing ships.
1/2400 0.7mm Ships.
1/3000 0.5mm Ships.