How do I find out what version of WordPress is running?

If you came here to find out about how to check WordPress version programmatically, then you can do it with the following code.

// Get the WP Version global.
global $wp_version;

// Now use $wp_version which will return a string value.
echo '<pre>' . var_dump( $wp_version ) . '</pre>';
// Output: string '4.6.1' (length=5)

Cheers!

In dashboard you can see running word press version at "At a Glance"