Hi K.,
I run a very sucessful babysitting service in Dallas/Fort Worth with over 30 families that I watch mostly on my own. I researched rates for a while for normal sittings, overnight and exteneded stays before offering my services. I went by the national avg. Here is what I got by and have had no complaints. You also have to figure in your area of the states and cost of livign etc... I am in Texas and cost of living is cheaper so I cant go to high on rates.
And yes to the lady below i know in Texas the min wage is $7.25 an hour. Also you dont want to take advantage of the family as you want their service in the future and vice versa.
Normal Sittings:
$12/hr for 1 or 2 children
$2 per hour for each addtional child 4 kids = $16 hour but this is normal sittings (nanny would be more as you have more responsibilities)
Overnight. I charge full rate till 11pm and then half rate till 8 am and then it begins at full rate again. This is for sittings like 6pm till 10 am or so... just an overnight.
Extended sitting which is what I would consider yours... I usually get these like friday from 5pm till Sunday at 5 pm so like 48 hours and that would be half rate. So if you had 1 kid it would be $6/hr $288 for the 2 days.
HTH