How can I calculate my worth?

I've never, truth be told, seen my work being expressed as the exact sum of money that it has delivered to the company. It's never been as tangible as that. I know some people can do that. They can say my work has brought in this many customers because I increased conversions by this and that or reduced the length of a process by this much and therefore this many more people engaged, but in all honesty, I can't do that. What I can only sign off of is my own conscience.

A couple of examples that I can think of... The best I can think about it is it's a piece of work that does what it needs to do and no more. It does so performantly and elegantly. And it can be read through, understood and ultimately tossed away by a person on my level or below who come in later to engage with it.