Rank Up! is a calculator that finds the best dungeons to run, based on the EXP you need and/or the Stamina you have.
Plug in some numbers to give it a whirl. Results will magically:
Take into account Daily Bonus events (such as 1/2 stamina).
Only suggest dungeons you have access to (customizable in Settings).
You can tweak search settings below, including which dungeons you don't want to run. You can enable/disable Co-op Mode. Once set, settings will be automatically remembered in future visits.