The best way to determine what your land is worth is to look up what other parcels have sold for. You will only want to look at recent sales to give you a true picture of the value. You will also need to ensure that the location is similar and the size of the lot is the same as the parcels sold. You may want a realtor to tell you how much it is worth. You are not required to list the property with the realator but use of a realtor will give you the most accurate information.