Do the math on devices you plug in and what each needs in Amps!
If you plug in devices like an iPad that can use 2+ Amps (usual come with 12 Watt charger) you could not even plug in 4 of them without hitting the charger limit in the Amps the first link points to. Don't just count outlets!
iPhones only need 1 Amp.
"There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge."
-- Isaac Asimov