Redirect Mapping & Canonicalization
Plan site migrations and estimate link equity preservation. Enter values for instant results with step-by-step formulas.
Formula
Equity Retained = (301s × 1.0) + (Chains × 0.85)
This calculator models SEO authority (Link Equity) retention. Direct 301 redirects preserve 100% of value. Redirect chains (A->B->C) dilute value and speed. 404s destroy value completely.
Worked Examples
Example 1: E-commerce Migration
Problem:1000 product pages. 800 redirected (301). 150 deleted (404). 50 chained.
Solution:Equity Retained: 800 + (50 * 0.85) = 842.5. Lost: 157.5. Retention: 84%.
Result:84% Equity Retained
Frequently Asked Questions
Does a 301 redirect lose PageRank?
Officially, no. Google stated in 2016 that 30x redirects do not lose PageRank. However, they do lose time (latency) and crawl budget.
What is a Redirect Chain?
When URL A redirects to B, and B redirects to C. This forces the browser/bot to make two hops. It slows down the site and can confuse bots. Always redirect A directly to C.