To implement the “Done ratio (% done)” feature, please do the following:
In the top menu, click on Your Avatar
Click Administration -> Settings, and then the Issue Tracking tab.
In the Calculate the issue done ratio with field, select Use the Issue Field to input a percentile done ratio on every issue; or,
In the Calculate the issue done ratio with field, select Use the Issue Status to define done ratio pre-sets on issue statuses (Your Avatar -> Administration -> Issue Status). This enables a status change to automatically set an issue to a certain done ratio.