As an example, if the task is started on 10/16 and ends on 10/21, technically on 18th the % complete should be ~50%. However, if you want the % complete from 17th, it should say ~25% This can be achieved used the following User Fields - SYN_Relative % Complete = FLOAT( (DATA_DATE - UFV("SYN_Relative Date")) /86400)/ FLOAT(( PROPERTY("Planned Finish") - UFV("SYN_Relative Date") ) /86400) *100 )