There is no algorithm telling you exactly how much you're worth. None whatsoever.
Some companies split salaries by "levels". You are Individual Contributor (IC) or Manager (M). As an IC, you have levels, from 1 to 6, where 1 means "worthless piece of shit" and 6 means "a God in your field". Your value is calculated, roughly, based on some generic metrics, and each of those "levels" has a minimum and a maximum threshold for salary size. Those thresholds vary by company, state, country, etc. A Senior Database Administrator job will have different thresholds based on where they work (employer name and geolocation), which LoB are they in (internal support is usually where the shit salaries are because that LoB doesn't directly generate any income), whether you work remotely and so on.
e.g. a Senior DBA in the SF Bay Area will have a minimum salary threshold higher than the maximum salary threshold for exactly the same job in Alabama, and probably someone from Romania would have to do the same thing for 10% of that.
Not to mention that these thresholds overlap through levels, e.g. the upper salary limit for an IC1 is only slightly higher than the lowest threshold for an IC3, so that management could fuck you in the ass by "promoting" you across levels with no salary change whatsoever and laugh in your face because they're covered by "procedures". You wanna quit? Good, they'll finally get to bring that 20-something year old who'll do the job for exactly what you were getting, but will be happy and grateful, unlike you.
So you tell me your value and I'll show you a gazillion counter-examples which make your point moot.
That's why I said "what you think you're worth". And even given two equal people living in the same area, doing the same job for the same LoB in the same company, their value, even if equal in theory, will be different in reality based on subjective factors: how young/old they are compared to their team, how tall they are, how their character is and how does it fit within the team, etc.
e.g. I don't drink, but my former manager used to heavily drink. he never fully trusted me because "I can't trust a man who doesn't drink with me until we both pass out", as he was saying. Yell "discrimination!" all you want, fact of the matter is that there's a huge amount of subjective things you can't prove and which could affect our salary and your prospective salary for that matter.
TL;DR: there is no such thing as "absolute value" for a job.