Overall Ranking Algorithm
24% Trust/Authority of the Host Domain
22% Link Popularity of the Specific Page
20% Anchor Text of External Links
15% On-Page Keyword Usage
7% Traffic and Click-Through Data
6% Social Graph Metrics
5% Registration and Hosting Data
On-Page (Keyword-Specific) Ranking Factors
1.Keyword Use Anywhere in the Title Tag
66% very high importance
2.Keyword Use as the First Word(s) of the Title Tag
63% high importance
3.Keyword Use in the Root Domain Name (e.g. keyword.com)
60% high importance
4.Keyword Use Anywhere in the H1 Headline Tag
49% moderate importance
5.Keyword Use in Internal Link Anchor Text on the Page
47% moderate importance
6.Keyword Use in External Link Anchor Text on the Page
46% moderate importance
7.Keyword Use as the First Word(s) in the H1 Tag
45% moderate importance
8.Keyword Use in the First 50-100 Words in HTML on the Page
45% moderate importance
9.Keyword Use in the Subdomain Name (e.g. keyword.seomoz.org)
42% low importance
10.Keyword Use in the Page Name URL (e.g. seomoz.org/folder/keyword.html)
38% low importance
11.Keyword Use in the Page Folder URL (e.g. seomoz.org/keyword/page.html)
37% low importance
12.Keyword Use in other Headline Tags
35% low importance
13.Keyword Use in Image Alt Text
33% minimal importance
14.Keyword Use / Number of Repetitions in the HTML Text on the Page
33% minimal importance
15.Keyword Use in Image Names Included on the Page (e.g. keyword.jpg)
33% minimal importance
16.Keyword Use in/or Tags
26% minimal importance
17.Keyword Density Formula (# of Keyword Uses ÷ Total # of Terms on the Page)
25% minimal importance
18.Keyword Use in List Items on the Page
23% very minimal importance
19.Keyword Use in the Page’s Query Parameters (e.g. seomoz.org/page.html?keyword)
22% very minimal importance
20.Keyword Use in/or Tags
21% very minimal importance
21.Keyword Use in the Meta Description Tag
19% very minimal importance
22.Keyword Use in the Page’s File Extension (e.g. seomoz.org/page.keyword)
12% very minimal importance
23.Keyword Use in Comment Tags in the HTML
6% very minimal importance
24.Keyword Use in the Meta Keywords Tag
5% very minimal importance
http://www.seomoz.org/article/search-ranking-factors
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This entry was posted on Tuesday, November 17th, 2009 at 8:03 pm and is filed under Search Engine Optimization & Internet Marketing .