Tangentially related, the stock Android calculator app is fantastic. It has good accuracy as mentioned in the article and an easy to explore and use history. It is one of the few things that will make me hunt around for my phone when I am working on my desktop.
As a refugee from Windows Phone I actually use Uno Calculator on Android, which is a port of Windows Calculator. It also has good accuracy and easy to explore history, and also sane interface without Android's idiosyncrasies. And you can install it on your presumably non-Windows desktop too.
