How to understand scale when choosing your farm toy or diecast replica

The picture above shows the range of difference between various scales.
"Scale" refers to the relative size of the replica toy to the actual vehicle, expressed as a fraction or a ratio. The large toy tractor is 1/16 the size of the actual tractor. Every inch on the replica equals 16 inches on the real tractor. The larger the scale, the smaller the denominator; a 1/16 scale toy is much larger than a 1/87.
"Scale" doesn't refer to actual size. For example, a 1/16 scale toy could measure 8, 12, or 14 inches long.