Eli5 how is size percentage measured?

Question

For example, the playstation classic is 45% smaller than the playstation 1 ( the original). Does that mean that the volume is 45% smaller?

In: Mathematics

Answer 1

The wiki page describes it as below so it is in width and length

>The console weighs about 170 grams (0.37 lb) and is about 149 mm × 33 mm × 105 mm (5.9 in × 1.3 in × 4.1 in) in size, approximately 80% smaller in volume than the original PlayStation and 45% smaller in width and length.

In general it is the measurement that the marketing department likes to use. As long as you in fine print define it.