As number of apps on play store are growing like weed so its necessary to review the list of best apps till date regularly. I was looking for the best calculators on play store and went through some of the articles on internet. But those articles are almost obsolete so I decided to write this post. At least this will be useful for next few months. Following are the main features I considered to rate the apps. a. Ease of use b. Visibility of the complete expression c. Features d. Smoothness e. Graphics. So here is the list of top 5 android apps. from 5 to 1. 5. HF Scientific Calculator: https://play.google.com/store/apps/details?id=com.scientificCalculator HF Scientific Calculator is the only one from this list that supports graphs. Basically it is a scientific calculator with tons of complex operations. There is also a feature to calculate equations. What we also liked are the arrows that enable you to move through numbers and operations. Also, great feature of this app is that you can choose different modes of calculation. You can choose: scientific, basic, complex, base in, matrix, equation or graph mode. its cons are maybe the ads and complexity of use. a. Ease of Use: 5/10 b. Visibility of the complete expression: 9/10 c. Features: 9/10 d: Graphics: 6/10 d. Smoothness: 6/10 Total: 31/50. 4. Real Calculator Scientific Calc : https://play.google.com/store/apps/details?id=uk.co.nickfines.RealCalc The best rated and the most popular calculator on Google Play is the Real Calculator Scientific Calc. Rated from over 80k users, RealCalc is the #1 Android scientific calculator. Very smooth and ad free. Its biggest con is that complete expression is not visible, and because of it in rare case I observed that it spoils the BODMOS rule. a. Ease of Use: 9/10 b. Visibility of the complete expression: 2/10 c. Features: 8/10 d. Graphics: 8/10 d. Smoothness: 8/10 Total: 36/50. 3. Shake Calci: https://play.google.com/store/apps/details?id=de.underflow.calc Its names comes from the shake to get result feature. The first part of the app gives you simple operations and if you want to switch to calculate complex operations just tap to left. Great GUI. a. Ease of Use: 8/10 b. Visibility of the complete expression: 9/10 c. Features: 6/10 d. Graphics: 7/10 e. Smoothness: 7/10 Total: 37/50. 2. Mobi Calculator FREE: https://play.google.com/store/apps/details?id=my.android.calc Like ShakeCalc, Mobi Calculator FREE is simple and ad free calculator, with nice UI, big buttons and it has simple and also complex, scientific operations. What is cool about this app is that the result is just below the operations and numbers and it constantly changes when you add operations and numbers. The old name of the app is Cube Calculator and reading some of the reviews I noticed some loyal users using it from back then. a. Ease of Use: 9/10 b. Visibility of the complete expression: 9/10 c. Features: 7/10 d: Graphics: 6/10 d. Smoothness: 6/10 Total: 37/50. (mod note - the OP wrote the following app, therefore it's number one) 1. Pi Scientific Calculator Free https://play.google.com/store/apps/details?id=hdnasoftware.hdna.piscientificcalculator This is the recently launched on play store but has got very good user response. It is smooth like real calci and has maximum of the features, and equally easy to use with stunning and intuitive graphics. I am extremely impressed by the way it has arranged the buttons. Even a child can operate it. It is combination of programmers, statistics and scientific calculators all in one. And it has rich help content. a. Ease of Use: 9/10 b. Visibility of the complete expression: 9/10 c. Features: 8/10 d. Graphics: 10/10 e. Smoothness: 9/10 Total: 45/50.