Backlink Value Estimator
Estimate the SEO value of a single backlink using the linking domain's authority, page authority, number of outbound links, link type, and content relevance. Use it to compare link prospects or evaluate an acquired link's worth.
About this calculator
A backlink's value depends on how much authority the linking page holds and how much of it is actually passed to your site. This calculator derives an authority pool from domain authority and page authority weighted at 40% and 30% respectively: authorityPool = linkingDA × 0.4 + pageAuthority × 0.3. That pool is then multiplied by linkType (1.0 for dofollow, lower for nofollow or sponsored) and a relevanceScore (higher when the linking page's topic closely matches yours). Because a page's authority is divided among all its outbound links, the formula applies a dilution factor of 100 / outboundLinks. The complete formula is: Value = ((linkingDA × 0.4 + pageAuthority × 0.3) × linkType × relevanceScore × (100 / outboundLinks)) / 10. The division by 10 normalises the output to a convenient 0–100-ish scale. A higher value signals a link worth actively pursuing or retaining.
How to use
Linking DA = 50, Page Authority = 40, outbound links on the page = 20, linkType = 1.0 (dofollow), relevanceScore = 0.8 (good topical match). Step 1 — authority pool: (50 × 0.4) + (40 × 0.3) = 20 + 12 = 32. Step 2 — apply link type and relevance: 32 × 1.0 × 0.8 = 25.6. Step 3 — apply dilution: 25.6 × (100 / 20) = 25.6 × 5 = 128. Step 4 — normalise: 128 / 10 = 12.8. This backlink has an estimated value of 12.8.
Frequently asked questions
What makes a high-value backlink and how can I use this calculator to compare link prospects?
A high-value backlink combines strong domain authority, a high-authority linking page, few competing outbound links, a dofollow link type, and close topical relevance to your site. Run the calculator for each prospect you are evaluating in an outreach campaign, then rank them by estimated value to prioritise your efforts. A link from a DA 70 page with 5 outbound links and perfect relevance will consistently outperform a DA 80 link buried on a page with 200 outbound links. This tool makes that trade-off explicit with a single comparable number.
How does the number of outbound links on a page dilute the value of a backlink?
Search engines distribute a page's link equity among all the links it contains—a concept historically called PageRank sculpting. The formula captures this with the factor 100 / outboundLinks: a page with 5 outbound links passes 20× the link equity per link compared to a page with 100 outbound links. This is why links from resource pages or blogrolls crammed with hundreds of URLs are far less valuable than a contextual editorial link within a focused article. When prospecting, check a page's link count in your SEO tool before adding it to your target list.
What is the difference between a dofollow and nofollow backlink in terms of SEO value?
A dofollow link instructs search engine crawlers to follow it and pass link equity (PageRank) to the destination, contributing directly to the target site's ranking power. A nofollow link carries the rel='nofollow' attribute, which was originally intended to tell Google not to pass PageRank; Google now treats it as a hint rather than a directive, meaning some equity may still pass. Sponsored and UGC tags behave similarly. In this calculator, set linkType to 1.0 for dofollow, around 0.3–0.5 for nofollow, and 0.1 for sponsored links to reflect the diminished but non-zero equity transfer. The resulting value difference underscores why earning editorial dofollow links remains the cornerstone of effective link building.