I am assuming you are talking about cousins. You have to do it manually.
Find your first common ancestor.
Count the number of generations between each person and that ancestor. Don't count the person or the common ancestor.
The smaller number will be the cousin count (1st, 2nd, 3rd etc). Any difference between the two counts is the removal number.
Example: If person 1 has 4 generations between him/her to the common ancestor and person 2 has only 2 then they are 2nd cousins twice removed.