The most efficient way to use the Lucky Egg is to open it, and then evolve 60 Pokemons in a row (since it takes roughly 30 seconds per evolution).
In this app, you input the number of Pokemons and the number of candies you have, and it will calculate the following:
- how many more Pokemons should you get before using a Lucky Egg
- how many additional candies you will need
- how many Pokemon you will be able to evolve currently
- how much XP will you gain if you evolve your Pokemon (both with and without the Lucky Egg)
- how many minutes will it take to evolve your Pokemon
- how many Pokemons and candies will you have left over
The app currently processes one Pokemon type at a time.