How to Add Google Plus Followers Widget in Blogger

Step-1:

Go to Your Blog

Click on Layout

Step-2:

Click on Add a Gadget

Step-3:

Now find Here Google+ Followers.

Step-4:

Now give it a title in Title Bar
If you want a custom size Click on Manually Specify and set it with your desired height & width.
And at last Select style Colour Theme
Click on Save Button, you have done it.