Model Car Size Guide

	1:18 scale Length (approx.) 23 cm, 238 mm, 9.1 inches
	1:24 scale Length (approx.) 16.5 cm, 179 mm, 6.5 inches
	1:32 scale Length (approx.) 12 cm, 134 mm, 4.7 inches
	1:43 scale Length (approx.) 10 cm, 100 mm, 4 inches

Thus, a 1/18 scale diecast car is usually about 24 - 30cm (depending on the size of the actual car).  A 1/24 scale diecast car is generally about 16 - 20cm. Many of the cars made in the smaller scales (1/32-1/38) are actually made so that the car will be exactly 5 inches long, regardless of the scale. 

Finally, it's important to note that larger vehicles, such as trucks or construction vehicles, are often made on a smaller scale (1/50 or 1/64), but are in fact about the size of 1/24 scale cars, since the actual vehicle is much larger.