If I understand it correctly (and someone please correct me if that's the case) DTI is calculcated with any recurring debt like loans, cc payments, mortgage, and so on. In your case depending how much your payment is on your student loan I would take that amount and add the other amounts you already provided to the rought estimate of $1050. Then take that total and divide by the ~$5000 a month you make and that will more or less determine your DTI.
DTI is rent or mortgage+car payment+min cc + any other loan payments (all monthly) divided by gross monthly income. This is what banks use to determine your DTI
Additionally, if the DTI is being calculated as part of a mortgage underwriting process, such as FHA, there may be various regs that provide for inclusion in the DTI calculation a percentage of amounts owed on reported collections.
Calculation of DTI has various factors that are dependent upon the intended use of the ratio.