104 RPN Calc is a pretty friendly calculator licensed under the GPLv3. It's good because it uses the Reverse Polish Notation. It's better because you can manipulate the stack to drop numbers or reorganize them. It's the best because you can write full mathematical expressions using the normal Infix Notation. Really, check the screenshots.
Civ Ysh K is the developer of the app that can be found in the Tools category. 104 RPN Calc has been downloaded and installed by over 100 users and the latest update was released on Jun 20, 2018. The overall rating for this application is 4.8 on Google Play.
Get the latest installer of 104 RPN Calc 3.1.2 free of charge and take a look at users' reviews on Droid Informer. The app is compatible with Android 2.3 and higher. This download is totally safe.