FREE Calculator App for AndroidFebruary 20, 2012 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Today’s FREE Amazon App of the day is the Calculator App for Android. You can download this for FREE today, 2/20 only. It’s regularly priced at $0.99 and has great reviews!It includes the simple calculator, a scientific calculator, and even a business calendar.