How To Find Out How Much Traffic a Blog Gets

wall mounted bike rack - reclaimed wood - clear oil finish
wall mounted bike rack - reclaimed wood - clear oil finish by: cantileverandpress

As Etsy sellers we are always looking for a way to increase traffic and sales.  One way to to this, is to advertise on high traffic blogs. There are a number of way to find out how much traffic a blog receives each day, and every month.
RSS Feed Subscription Numbers:
The fist method is to do a little investigating.   I like to look for how many people are subscribed to a blogs RSS feed.   The majority of the people that are subscribed to the RSS feed visit that blog everyday, not everyone, but a good amount.  Take for example Handmadeology.  There are currently over 3000 people subscribed to the RSS feed in less then 60 days.  Everyday these people will get an update via email of any new blog posts that were posted.   
Social Networks:
I also like to take a look at a blogger reach throughout social media, like Twitter and Facebook.  Is the blogger active on Twitter or Facebook?  What are the number of followers like.  This can be a good gauge of the amount for traffic they may get.
Read their advertising info:
Bloggers will most likely talk about how much traffic they are getting right on their advertising info page.  Also look for any major press the blog may have received recently.  Modishdirectly talks about how much traffic they receive and lists a nice press link.
Compete is a great site where you can get a look at three sites at one time and compare. Compete gives you a look at monthly traffic and gives you a nice look at an over all year. One draw back is that to view blogs that are on blogger like Oh Hello Friend you have to upgrade.
Here is a super in depth look at a site.  You can find out a sites traffic, it’s demographics, trends,  and a ton more.
Here is  look a the very popular DesignSponge.
Before you make your decision to advertise with a blog, do your research.  You can even ask around the Etsy forums, to see if anyone has advertised on a particular blog before.