Yes, using Google Analytics’ Explore report, you can actually see what percentage of your site’s visitors are using mobile versus desktop. Here’s a basic outline of how you can do this. Under the ‘Audience’ section in your Google Analytics account, navigate to ‘Mobile’ and then ‘Overview’. Here you will be able to see the breakdown of visitors using desktop, mobile and tablet. To find out the ratio or percentage, you just need to divide the number of mobile visitors by the total number of visitors (the sum of mobile, desktop and tablet users). So for instance, if you have 500 mobile visitors out of a total of 2000, your mobile visitor percentage would be 25%. Remember to adjust the date range for the specific period you are interested in analyzing.