Revolectrix has a whole host of power calculators for not only their LiPo chargers but also a generic one as well. It can be a really handy tool to have so I thought Id share. Theyve also added a new one for the Dual PL8 charger (I totally want one!)
http://www.revolectrix.com/Calculators_main.htm
http://www.revolectrix.com/Calculators_main.htm