5 SEO Formulas for E-commerce Owners (& more...)

Keyword Density Formula:

• Formula: Keyword Density = (Number of Times Keyword Appears / Total Word Count) × 100
• Example: A blog post of 1,000 words contains the target keyword 15 times, resulting in a keyword density of 1.5%.
• Where to Use: Measures the frequency of a keyword’s appearance in content.

Click-Through Rate (CTR) Formula for SERP:

• Formula: SERP CTR = (Clicks / Impressions) × 100
• Example: A webpage appeared 1,000 times in search results and received 50 clicks, resulting in a CTR of 5%.
• Where to Use: Measures the percentage of people who click on a website in search results.

Bounce Rate Formula for Organic Traffic:

• Formula: Organic Bounce Rate = (Number of Single-Page Visits / Total Organic Visits) × 100
• Example: A website had 300 single-page visits out of 1,000 organic visits, resulting in a bounce rate of 30%.
• Where to Use: Indicates the percentage of visitors who leave the website without interacting further from organic search.

Keyword Effectiveness Index (KEI) Formula:

• Formula: KEI = (Number of Searches / Competition)²
• Example: A keyword with 10,000 searches per month and a competition score of 500 has a KEI of 400,000.
• Where to Use: Helps identify the best keywords by comparing search volume and competition.

Page Authority Formula:

• Formula: Page Authority = (Sum of Link Values / Number of Links) × Crawl Depth
• Example: A page with 50 link values from 20 links and a crawl depth of 4 has a page authority of 10.
• Where to Use: Evaluates the potential ranking strength of a specific webpage.

Domain Authority Formula:

• Formula: Domain Authority = (Sum of Page Authorities / Number of Pages) × Site Age
• Example: A website with 100 pages, an average page authority of 20, and a site age of 5 years has a domain authority of 400.
• Where to Use: Measures the overall ranking strength of an entire domain.

Backlink Quality Score Formula:

• Formula: Backlink Quality Score = (Relevance + Authority) / Link Velocity
• Example: A backlink from a highly relevant site with high authority and a slow link velocity scores 90 in backlink quality.
• Where to Use: Evaluates the quality of backlinks based on relevance, authority, and acquisition rate.

Link Equity Distribution Formula:

• Formula: Link Equity = (PageRank / Number of Outbound Links) × 100
• Example: A page with a PageRank of 80 and 10 outbound links distributes 8 link equity to each link.
• Where to Use: Analyzes how PageRank is distributed among outgoing links.

Keyword Difficulty Formula:

• Formula: Keyword Difficulty = (Competition Score + Search Volume) / 2
• Example: A keyword with a competition score of 60 and a search volume of 5,000 has a keyword difficulty of 2530.
• Where to Use: Helps assess the difficulty level of ranking for a particular keyword.

Canonicalization Ratio Formula:

• Formula: Canonicalization Ratio = (Number of Canonical URLs / Total URLs) × 100
• Example: A website has 200 canonical URLs out of a total of 500, resulting in a canonicalization ratio of 40%.
• Where to Use: Measures the percentage of canonical URLs relative to total URLs.

Internal Linking Score Formula:

• Formula: Internal Linking Score = (Number of Internal Links / Total Pages) × 100
• Example: A website with 2,000 internal links across 500 pages has an internal linking score of 400%.
• Where to Use: Assesses the ratio of internal links to the total number of pages.

Crawl Budget Efficiency Formula:

• Formula: Crawl Efficiency = (Crawl Budget Consumed / Total Crawl Budget) × 100
• Example: A website utilized 70% of its allocated crawl budget, resulting in a crawl efficiency of 70%.
• Where to Use: Measures the utilization of the allocated crawl budget by search engines.

Indexation Rate Formula:

• Formula: Indexation Rate = (Indexed Pages / Total Pages) × 100
• Example: Out of 1,000 pages, search engines indexed 800, resulting in an indexation rate of 80%.
• Where to Use: Measures the proportion of website pages indexed by search engines.

Content Relevance Score Formula:

• Formula: Content Relevance Score = (Keyword Placement + Semantic Relevance) / Word Count
• Example: An article with optimal keyword placement, high semantic relevance, and 1000 words scores 8 in content relevance.
• Where to Use: Evaluates the relevance of content based on keyword usage and context.

Structured Data Implementation Rate Formula:

• Formula: Structured Data Rate = (Pages with Structured Data Markup / Total Pages) × 100
• Example: Out of 500 pages, 200 pages implement structured data, resulting in a rate of 40%.
• Where to Use: Measures the implementation of structured data across a website.