LoopyLupo, I would reckon on at least 3 meals for our family of 5 from one chicken.
First day as a roast (prob use about half the chicken)
Then strip the chicken (all of it, even scraggy gristly bits)
Most of the 'nice' stripped meat (ie not the fatty/skin/gristly bits) I would use in a second meal: curry/risotto/stir fry with lots of added veg/lentils/beans (depending on which meal, obvs).
the carcass and scraggy bits of meat I would chuck in a pot with a couple of potatoes and odd bits of veg, depending on what I had needing using up/in the freezer, to make a soup. Also any other 'bits' that might need using up, eg the odd slice of ham or bacon. My dc won't eat soup, so I use it as a pasta sauce or over rice for them, so that is an added expense.
If I made curry I would expect it to feed the 5 of us once, then at least 3 or 4 portions for dd1 to use as lunch (she takes hot meals to school), or a further meal for the children and a couple of portions for school lunch.
the soup would do us all (with added pasta/rice as above) once, then a further meal for the children.
so, adding up (I reckon my 3 children eat the equivalent of 2 adults), 1 chicken would do:
3 adult portions as a roast
6 (probably) adult portions as a curry
4 or 5 adult portions as a soup.