On Friday, January 19, 2018 at 2:26:54 PM UTC-6, DerbyDad03 wrote:
Mike's mention of the level app on his phone reminded me of an app I found a few months
ago and have been using quite often for my bookcase project.

Fraction Calculator Plus

I use the Dewalt Mobile Pro app. Its free and has lots of addins for carpentry and construction work.