Write a chart or graph showing the time you both spend at work every day. That part is easy.
Then include in the chart the time every day you both spend commuting, if applicable. Again, easy.
Sleep - easy.
Then comes the nitty gritty - food inventory, grocery lists, shopping, putting away, cooking, washing up, loading and emptying the dishwasher, tidying, laundry - gathering, washing, drying, ironing/folding/putting away, cleaning various rooms, gardening, diy, car care, administration (bill paying, insurance research and renewal), holiday planning, booking, packing, unpacking, taking care of the children - keeping track of clothes, toys, commute to nursery, dealing with communication with nursery, feeding, packing bag for nursery, playing/ supervising, bathing, taking care of when sick or awake in the night, and everything else you can think of.
Then add leisure time, including sitting on the couch in the evening.
The resulting visual should tell him that he is taking the piss.
You should also stop doing his laundry and anything you do that benefits him.
There needs to be some form of punishment that is directly related to his assumption that you were put on this earth to serve his lazy arse.