GA Event as Trigger?

Yes, but you would need to kick off an API call to Marketo to do it.

@Duane Kennerson​

Rather than trigger off the GA event, it would be simplest to trigger a silent Marketo form submit at the same time (form could be just an email address, or whatever other data from the calculator you want to map in to Marketo fields).

http://developers.marketo.com/blog/make-a-marketo-form-submission-in-the-background/

As Justin suggests, you can do a silent Marketo form submission in the GA hitCallback listener.

For a lighter-weight approach you could instead log a Munchkin API hit:

ga('send', 'event', {
  'eventCategory': 'Calculator',
  'eventAction': 'Calculated',

  'hitCallback': function() {
    Munchkin.munchkinFunction('clickLink',{ href: '/forms/calculator/calculated' });
  }
});