This is a simple app that lets you know how many characters/words are in your phrase! Remember that the ideal numbers are 8-14 word headlines AND 80 characters or fewer, otherwise some bits may be cut off.
http://title-checker.surge.sh/
How long should your headline be? HubSpot analyzed 6,000 blog posts and found that stories with 8 to 14-word headlines get more social media shares. This said, make sure your headline is 80 characters or fewer. Otherwise, the title will get truncated in news feeds when people share your article on Facebook and Twitter.
-via Quincy Larson
SEO study can be found here