We see a lot of new people to the mechanical keyboard hobby/world/lifestyle - and we often see the same questions and level of confusion around understanding "what a 65% keyboard is" or "the difference between a TKL and a 60". To help answer a few of those questions, we created a simple visual aid.
This graphic does not hold every possibility or every unique layout and style - but it does cover the basics for the most common on the market.
The easiest way to understand the "percentages" is to start at the top - a 100% keyboard, being the traditional full size, 104/108 key layout that almost everyone that has purchased a new 'off the shelf' keyboard in a big box retail store knows. As you get smaller and remove more and more keys from the board - that percentage drops.