There are lots of places online to find nutritional information from fast food chains (at least its available; there was a time when fast food places intentionally hid this data from customers).

Free listing site Fatburgr, though, might just be the most straight-forward and helpful when you’re traveling, and its available for free with a iPhone-optimized version, no sign-up required, here: http://fatburgr.com/

The site uses only information from the chains themselves in its listings, and offers them up by restaurant name or category (burger, taco, appetizer, etc.) It’s only a basic four numbers after each listing—calories, fat, carbs, and Weight Watchers Points—and any list can be sorted by any heading.

So those on detailed diets will likely look elsewhere, but for a quick read on what’s reasonably not-bad for you during a chain stop, Fatburgr’s low-clutter, quick skim interface is great. More detail needs to be next on their list for updates, however.