From what I've found it's not perfectly linear so you can't get a quick and easy number unless you've put in the homework already and have the info saved in a spreadsheet. Most accurate is to simply go to player search, sort by salary, and find a player with the same OVR rating and year of arbitration as your guy. If I remember right, baseline #'s for 85 OVR rated player is ~$2.0M 1st year, ~$7.5M 2nd year. I don't know third year because most people extend after 2nd year. Don't quote me on this part but if I'm not mistaken, I believe performance also has an impact. Although I believe it's tied to games played or AB as opposed to AVG, HR or similar metrics.