> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.ranktracker.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# What is Spam Score and how is it calculated?

What is Spam Score?
Spam Score is Ranktracker's proprietary metric indicating the spam level of a page, group of pages, or an entire domain (depending on the endpoint you’re using). It can take values from 0% to 100%:

A score of 0%-30% is considered a low Spam Score.

A score of 31%-60% is considered a medium Spam Score.

A score of 61%-100% is considered a high Spam Score.

The score is calculated based on 18 signals, which are listed in the table below.

How Spam Score of a page is calculated
To calculate the Spam Score for a page, the API considers various signals: from whether the page has contact information to which protocol it uses (HTTP or HTTPS). Below we list all the signals and show their impact on the overall score.

| Signal | Impact on the score |
| --- | --- | --- |
|Domain name length (including TLD) is less than 3, equal to 3, or greater than 20 characters|	+10%|
|Main domain contains more than or equal to 2 numeric characters|	+15%|
|Subdomain contains more than or equal to 2 numeric characters|	+20%|
|Domain contains one of the TLDs associated with spammy websites* (see the list below)	|+20%|
|Page doesn’t contain link or script tags from trustworthy sources (Google, Bing, Facebook, Twitter) inside the head element|	+20%|
|Page contains link or script tags from trustworthy sources (Google, Bing, Facebook, Twitter) inside the head element|	-(number of sources * 5)|
|Page contains social meta tags|	-15%|
|Page contains contact info|	-20%|
|Page utilizes non-local rel canonical tag|+20%|
|Website uses the insecure HTTP protocol instead of HTTPS|	+30%|
|Page doesn’t have a title tag or its title tag is less than 30 or greater than 65 characters|	+5%|
|Page has a title tag and its title tag is greater than 30 or less than 65 characters|	-5%|
|Page doesn’t have a description tag or its decsription tag is less than 40 or greater than 200 characters	|+5%|
|Page has a description tag and its description tag is greater than 40 or less than 200 characters|	-5%|
|Page has more than 10 keywords in the meta keywords tag	|+15%|
|Page has more than 100 external links|	+20%|
|Page has more than 500 internal links|	+15%|
|Ratio of external links to internal links is greater than 3|	+15%|

*TLDs associated with spammy websites:
```
.surf, .cn, .cfd, .ga, .biz, .hk, .pw, .icu, .top, .tw, .gq, .work, .cf, .cam, .ml, .bit.ly, .bit.do, .ow.ly, .goo.gl, .x.co, .rebrand.ly, .tinyurl.com, .t.co, .is.gd, .ht.ly, .xyz, .best

```

How Spam Score of a domain is calculated
When it comes to calculating the Spam Score for a group of pages (backlinks_spam_score) or an entire domain (target_spam_score), the API calculates the Spam Score for each individual page and then finds the average.

For example, if a domain has 5 pages with 30%, 45%, 20%, 10%, and 70% Spam Scores, then its Spam Score will be: (30 + 45 + 20 + 10 + 70) / 5 = 35%.