Google has a traffic estimator (aka Traffic Estimator Sandbox) that allows you to check the amount of clicks each key term/phrase will generate per day, but they require you to put in a lot of information (regarding CPC, target country, etc.).

So, if you bookmark this page, this form could just make things a little bit simpler:

Keyword tips

[keyword] - if you want to measure an exact search term/phrase.

“keyword” - includes phrase with possible search terms added to it.

keyword - broad/general search.

-keyword - negates a term.

PS: I don’t think anyone else has posted this form on any websites, but it’s always possible.