Civic Coolant Engine Capacity

The reason being is that there are two drain plugs at the front and back of engine block. These are very difficult and awkward to get off so I am going about it a different way in order to get all the coolant/water mixture from the engine block...Firstly I will empty the rad, fill with clean water and run the engine . Iwill do this several times with the temp high until I am satisified that all I am getting out of the rad is clean water. Now, this is why I need to know the exact capacity: I will then fill the rad with half the capacity of the system with undilluted coolant. I will then top up to the neck with water and whehey, I have a 50/50 mixture. Obviously I will drain off any air and fill the resevoir with 50/50 mixture.
So, does anybody know the capacity of the whole system??