"Customer support" is such a broad term, it covers a lot of different roles. This calculator (and the data it is based on) are a super helpful way to get a sense of what people are paid in the tech-support / online retail / SaaS support worlds. It's much more relevant than what you get looking at "customer service salary" in general. There are limitations of course, but as a rough guide to what you can expect to earn, it's great.