How Much of My Site is in Google’s Supplemental Index?

So there's a lot going on with Google and their Supplemental Index recently. I honestly haven't been paying close attention to any super new news, but I do know a couple ways which people have tried to figure out if their site is in Google's Supplemental index. Here are some various methods and how my site stacks up.

Method (Number of pages | description of results):

1.) site:www.dennisplucinik.com ***-slktf (4 pages | Probably the Supplemental)
2.) site:www.dennisplucinik.com *** -view (135 pages | bogus/nothing - see below(*))
3.) site:www.dennisplucinik.com/& (142 pages | nothing special)
4.) site:www.dennisplucinik.com (142 pages | all indexed pages)
5.) site:www.dennisplucinik.com -inallurl:www.dennisplucinik.com (128 pages | all indexed pages NOT in the Supplemental)

Also I came across this site today which basically determines the percentage of pages on your site which are indexed Supplementally:
Google's Supplemental Index Ratio Calculator

The way it works is this:

1) Replace my domain with yours and search for this in Google:

site:www.dennisplucinik.com -inallurl:www.dennisplucinik.com

- This will display all the results from your website which are NOT in the Supplemental index.

2) Replace my domain with yours and search for this in Google:

site:www.dennisplucinik.com

- This will display all the results from your website which INCLUDING the ones in the Supplemental.

To figure out your percentage of pages in the Supplemental do this math:

(1-("Pages NOT in Supplemental"/"All pages"))*100

For instance, I have 142 pages total, and 128 NOT in the Supplemental, so I would do:

= (1-(128/142))*100
= (1-(0.90140845...))*100
= .09859154...*100
= 9.86%

I also did a check of these methods on a site for a large eCommerce company which I know has tens of thousands of pages indexed in Google and here are the results:

1.) site:www.dacardworld.com ***-slktf (2 pages)
2.) site:www.dacardworld.com *** -view (1,580 pages)
3.) site:www.dacardworld.com/& (40,100 pages)
4.) site:www.dacardworld.com (40,700 pages)
5.) site:www.dacardworld.com -inallurl:www.dacardworld.com (1,260 pages)

In closing, I think that method 2 and 5 are returning some kind of listing of results with something missing. It is implied that the missing results make up the Supplemental index although method 5 can be 5-20% less than method 2 so... ? Also method 1 is returning pages from some very specific somewhere. I wonder where.

I just did an interesting test on method 2 because I suspect it to be bogus(*). Basically searching for the following terms in Google produces this:

site:www.dennisplucinik.com *** -view    ...returns 135 pages
site:www.dennisplucinik.com *** "view"   ...returns 7 pages
site:www.dennisplucinik.com              ...returns 142 pages

If you didn't catch that: 7 + 135 = 142
This basically proves the "*** -view" method as bogus since all it does is returns your pages without the word "view" in it.

Basically you're going to need to draw your own conclusions. If anyone has any other input on this topic, I'd be thrilled to hear some current discussion on it. Anyways, I hope this helps clear things up a little bit for now.

(On a supplemental closing note, there are many companies making a killing online with a significant percentage of their pages in the Supplemental index. Granted - they spend a significant amount of money on pay per click advertising with Google. So I guess I'm saying, it is still possible to run a profitable online business with poor organic rankings as long as you pay Google money to advertise on AdSense.)

  1. James Curley says:

    Avoiding inclusion in supplemental results is much easier than getting your site out of the sups. The problem is new eCommerce merchants can’t comprehended what the problem is with duplicate content until they are stuck in the sups themselves.

    Below is a link to an article that discusses ecommerce catalog development and hits on many important topics like duplicate content etc. It is a good read those who want to avoid the pitfalls and start off right.

    Read more about Catalog Development

    Thanks for shedding some light on fixing the supplemental blues.

  2. Kilovars says:

    Thanks guys for the information.

  3. hi, this information so valid. so what are the steps to taken for get out of this supplymental index issue?. How long Google will keeps this pages in Supply mental index?

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