COBEN, short for Chance Of Being Eliminated Next, is a percentage denoting the probability of a contestant getting eliminated, based on the current scores of everyone still in and the rewards for the next event.
This calculator is built with Mavo, a library for building web applications in HTML, saving me the time and hassle with interactivity.
Currently, the best way to use this calculator is to make a few lists separated with line breaks: one for contestant names, one for current scores, and one for rewards for the next event. Then, copy-paste those lists here. It is therefore useful when working with a spreadsheet.