Based on the tables in http://en.wikipedia.org/wiki/Cost_of_raising_a_child for the US. I estimated that the cost of raising 2.5 children for 22 years (up to 18 plus college) as nearly $1.4 million. This may be low balling it if you invest heavily in extra educational and extra-circular activities for your children. So I said between 5-10 million as I would also need some margin for me, my wife and retirement. Howeve…
I looked at the wiki articles and I'm not seeing the 1.4 million spec. Are you sure you didn't make an arithmetic error and calculate 25 kids instead of 2.5 kids? I'd need psychological counseling to handle 25 kids. I never thought schoolteachers earned their pay until I had kids of my own.
The wikipedia tables don't make much sense to me. I'm in the 2 kids and dual parent and somewhat into the "More than $102,870" category (though not too far into it) and I have about a decade of experience budgeting for the kids and I'm mystified how I am supposedly spending $6K every year transporting my kids. That would be like 1500 gallons of gas or 67500 miles per year? My wife bought a relatively loaded Prius in '05 and its getting a bit worn out after 8 years of extremely heavy use so that superficially seems expensive, but she traded in a fast little 2-door and would presumably have dropped the same cash on an equally expensive, yet smaller/faster car if we didn't have kids. So the cost of transport is the extra gas she burns going to daycare? Or little league? Its just not that much. The food estimate seems about right, we eat very well, it is probably about $2K/month maybe $3K/month for the whole family. Clothing cost is more like zero for little kids, assuming you have Grandma and Auntie in the area. Grandma especially seems to feel unable to visit without some kind of textile product in hand. When the teen years hit and its not cool to wear something grannie picked out, I'm sure that cost will rise from current basically $0. The housing cost is fairly mystifying as it in no way approaches the cost of paying for the house, then again without kids we'd just have a fancier apartment for the same money so much like the car, the cost of kids is zero. Health is a bit high as we have a household deductible, unless they're counting bandaids or something, I believe its exactly $1500/x where x is the number of family members, I guess. Child care is absolutely ridiculous, its more like $10K until grade school and then it drops to practically nothing maybe $3K to cover summers and camp and stuff. Misc is hilarous $2K total per year yeah maybe for just the ITMS or cable TV or something LOL. That's probably more like $10K per kid.
Anyway thats my experience of the hilarious wikipedia table based on a decade of actual experience budgeting.