Before you use another child support calculator, read this! If you're basing important decisions on the calculations performed by other calculators, you may want to reconsider. Decisions such as dragging your case back into the court room, or reaching an ammicable agreement with the other parent on child support should be based on sound information and calculations. We set out to put a few popular child support calculators to the test. We can conclude that some of the child support calculators out there may leave you with the short end of the stick.