CalculatePlus is described as 'ble to perform metric and non-metric conversions and basic calculations on a huge database fast and with brilliance' and is an app in the Education & Reference category. There are more than 10 alternatives to CalculatePlus for a variety of platforms, including Android, Online / Web-based, iPhone, Android Tablet and Windows Phone. The best alternative is Unit Converter Ultimate, which is both free and Open Source. Other great apps like CalculatePlus are Convertbot (Paid), multiConvert (Free, Open Source), Converter (Free, Open Source) and SwissConverter (Paid).
Convertbot is a unit conversion robot. Convert currency, length, mass, time and much more in an exciting new way! Converting numbers will never again be a mundane task. In addition to its innovative interface, our robot is smart enough to convert to and from mixed units.
A simple and ever-growing unit converter, SwissConverter is great for both personal and professional use. At the moment, with 16 categories and 320 units, it covers your basic use of unit conversions with ease.