The Envelope Punch Board Calc'tor, developed by Stefan Steinborn, is a free Android app that simplifies the process of determining the dimensions for paper and score lines for the Envelope Punch Board of Stampin Up and We R Memory Keepers.

This app allows users to specify the length, width, and height of the envelope or box they wish to create, as well as the space that should be left free around the object to be packaged inside. The app offers the option of using either centimeters or inches as a measuring unit.

With Envelope Punch Board Calc'tor, users can easily determine the dimensions and score lines required for their envelope or box project without the need for manual calculations. It is a useful tool for those who frequently work with paper-based packaging.