90% of laptops have power supplies that can accept anything between 110 and 240V. My Lenovo does. But you should check yours. I believe the standard iPad charger does as well...mine does. In which case all you need is a simple 2 pin round to US 2 flat adapter and you are ok.
Yeah, most power supplies nowadays are auto-switching but it still a good idea to make sure as my wife has once borked her camera when plugging it in without a proper converter (her camera charger was not auto-switching).
Sometimes the power supplies are not auto-switching but do have a switch on the side to manually change it.
If not using such a power supply then you will also need a power converter.