Enter the data and push the button at the bottom. Dragons with zero egg cost will not be calculated. (Help)Get the quantity of eggs you have and the number of dragons (levels 1 through 4) from your Dragon Book. Get the current cost of a dragon egg from the Buy Menu. If you don't want data on a dragon, leave it's egg cost at zero.
For dragon eggs purchased with gems, go to Merge Dragons Nest Calculator (Gem Edition)
* Assumes two level 7 dragons gained per nest