Progwhiz Base Calculator is a powerful yet extremely simple user friendly base computation utility. It allows you to execute Addition and Subtraction of any Hex, Decimal, Binary or Octal numbers and give the result in any of those Bases. You can mix and match different bases or at the click of a button change the represented value in any of the four(4) bases. It's that simple!

https://youtu.be/xGwNrEYT6Rk