How much child support is required, including college expenses, for 18 year old daughter?

My name is David Salvaggio.  I have more than 35 years of legal experience and head a law firm that devotes its practice exclusively to New Jersey Divorce and Family Law matters.  I have seen your question. Unfortunately, no good lawyer will be able to provide a proper answer without meeting with your friend and getting a lot more information and complete documentation.      You do not say whether your friend is being represented by a lawyer with respect to the mother's court application.  If the answer is yes, that lawyer should be able to answer the question.  If the answer is no, that is a mistake on your friend's part.   Many people try to "save money" by foregoing the advice of a good New Jersey Family Law attorney.  They certainly have the right to do that, but in my many years of experience as a lawyer who devotes my entire practice to New Jersey Divorce and Family Law matters, I have seen that strategy result in the loss of a lot more money than what good legal advice would have cost.        Therefore, I offer what is called an Assessment, in which I will go over the person’s situation in detail, answer his/her questions, and give that person guidance as to the best course of action. Typically, the Assessment lasts about an hour.  The cost is $450. Your question does not specify the town in which your friend lives.  My firm's offices are located in Morristown, NJ (Morris County).  We handle cases in all of the counties in northern and central New Jersey, including not only Morris County but also Somerset, Hunterdon, Sussex, Warren, Passaic, Bergen, Hudson, Middlesex and Monmouth counties. If your friend lives in one of those counties and wish to schedule an Assessment, please have your friend call my office (973-455-1220) and speak to the firm’s Client Intake Coordinator Dara Vanderhoof.  She will be able to arrange a mutually convenient date and time for the Assessment.