You can calibrate a laptop.. just bear in mind that most laptops have pretty crap screens and the viewing angle is crucial. Change teh viewing angle, and you've effectively changed the profile... even with IPS.. the vertical viewing angles aren't that great compared to horizontal.
Another thing to consider is any automatic ambient adjustments. A great many laptops will brighten or darken the screen in accordance with ambient light levels... you need to turn all that crap off before you profile... and keep it off once profiled.