This document describes a unit converter mobile application that allows users to convert between temperature units (Kelvin, Celsius, Fahrenheit) and convert decimal numbers to their binary, octal, and hexadecimal equivalents. The app provides an accurate and user-friendly interface for offline conversions on Android devices. It was developed using Eclipse software on a Windows 10 system. The app includes welcome and thank you screens and allows direct conversion between each temperature unit pair and conversion of decimal numbers to other number systems.