There are many other scales for the models, particularly earthmoving equipment and trucks which are typically 1/50 scale, and as the real machines of such models are quite large, a 1/50 scale model of such machines could be in the range of 20 to 40 cm long.

Scale represents a fraction of real size. A vehicle that is 16 feet long in real life, will be 1 foot long in 1/16th scale. The larger the denominator of the fraction, the smaller the model will be. 1/16 scale is twice as big as 1/32.

The scale size of a model is a fraction of the real size. A 1:18 scale model is 1/18th the size of the real vehicle. The smaller the number in the scale size, the larger the model.