You need an app for that?
If our tilt indicators had more significant digits, I could see it, but the answer is usually rounded to the nearest half degree.
Now as for what wedge will be sharp - how high up in the trees will be clear - that you need to know sensor size and f-stop. Torger posted a truly wonderful paper on focus with tilts. VERY highly recommended.
(I am, of course, joking about doing this mentally. Any calculation made at 5am is going to be wrong. )