You would first look at the value of your car when its in good working condition. A great place to find this at Kelley Blue Book:
http://www.kbb.org
You can also choose different options on the condition of the car and such for a better take on the actual value. The value is obviously going to be subjective, so its up to you to determine the value based on how much its worth compared to what is damaged and how badly damaged. You should be able to get a ballpark amount from doing this.


