clipped from: lifehacker.com Their "Art of cooking an egg" page contains a handy little Flash application that turns variables like egg circumference, desired yolk hardness, the egg's current temperature, and your elevation, then spits out exactly how long you should boil that egg. The site is in Norwegian, but this page provides a translation (minus the Flash app)—and reader Martin offered a quick rundown of what each segment of the Flash app asks for:
1st slider: The circumference of the egg (in cm)
2nd slider: How hard you want the egg yolk to be. (Hard = Hard, Middels = Medium, Bløtt = Soft)
3rd slider: Start temprature of the egg (on the botton, its directly from the fridge. In celcius)
4th slider: How high over the sea level you are in meters. (Because water boils faster the higher you are.) moh = meters over the sea level