In Tamriel Unlimited (Elder Scrolls Online (ESO)) there is a Champion Point system and by adding champion points to the Thief constellations (Tower, Shadow and Lover constellations) characters can gain additional Stamina. Below is a calculator which will calculate the effects on Stamina with changes in points in the tree. The data used to derive the equations was gathered by @Bouvin. It should be noted that while 400 points (100 per star) may be put into each constellation (meaning 1200 are possible for the Thief), only the first 1000 points will increase you stamina. This was discovered by @Soulac and many thanks to him for this tidbit. He created and supports standalone build planner that fulfills a slightly different purpose than my calculators.
If you encounter a wildly inaccurate calculation please submit it through the Contact Us Forum on the homepage.