Tailwind CSS IntelliSense will give you a list of all the possible classes with the associated pixel value.

You can also do text-[20px] if you really need that specific size.

Intellisense would help a lot with this task: https://gist.github.com/crswll/db0d276bbf0884b003f3715d48e68...

No but when you select an intellisense suggestion, before hitting enter, it’ll show you the underlying css. That can sort of give you the same effect even if in reverse.