It's 1:1 with comment upvotes, less with submission upvotes (how much less I'm not sure but my observation would peg it around 3:1). Personally I think it should be the other way around as a submission can add a lot more value than a comment.
The equation ends up looking something like this: https://slack-files.com/TEGQB8GNS-F01UU5FMKRR-820b186081
Once you start thinking about it in terms of the definite integrals of a piecewise function you'll see where the weights would be applied in more extreme situations.